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Signal-Server/ppa.cpp
Cloud-RF 506049d823 v2.3.1 
Upgraded ERP to 5MW.
2014-12-18 19:53:17 +00:00

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/****************************************************************************\
* PPA: Path Profile Analysis Tool v1.3.1 derived from SPLAT! 1.3 *
******************************************************************************
* Project started in 1997 by John A. Magliacane, KD2BD *
* Last update: 10-Apr-2009 *
******************************************************************************
* Please consult the documentation for a complete list of *
* individuals who have contributed to this project. *
******************************************************************************
* *
* This program is free software; you can redistribute it and/or modify it *
* under the terms of the GNU General Public License as published by the *
* Free Software Foundation; either version 2 of the License or any later *
* version. *
* *
* This program is distributed in the hope that it will useful, but WITHOUT *
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or *
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
* for more details. *
* *
******************************************************************************
* g++ -Wall -O3 -s -lm -fomit-frame-pointer itm.cpp ppa.cpp -o ppa *
\****************************************************************************/
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#define GAMMA 2.5
#define BZBUFFER 65536
#define HD_MODE 0
#define MAXPAGES 64
#define ARRAYSIZE 76810
#define IPPD 1200
#ifndef PI
#define PI 3.141592653589793
#endif
#ifndef TWOPI
#define TWOPI 6.283185307179586
#endif
#ifndef HALFPI
#define HALFPI 1.570796326794896
#endif
#define DEG2RAD 1.74532925199e-02
#define EARTHRADIUS 20902230.97
#define METERS_PER_MILE 1609.344
#define METERS_PER_FOOT 0.3048
#define KM_PER_MILE 1.609344
#define FOUR_THIRDS 1.3333333333333
char string[255], sdf_path[255], opened=0, gpsav=0, ppa_name[10],
ppa_version[6], dashes[80];
double earthradius, max_range=0.0, forced_erp=-1.0, dpp, ppd,
fzone_clearance=0.6, clutter, loss, dBm, field_strength;
int min_north=90, max_north=-90, min_west=360, max_west=-1, ippd, mpi,
max_elevation=-32768, min_elevation=32768, bzerror, contour_threshold, output=2;
unsigned char got_elevation_pattern, got_azimuth_pattern, metric=0, dbm=0;
struct site { double lat;
double lon;
float alt;
char name[50];
char filename[255];
} site;
struct path { double lat[ARRAYSIZE];
double lon[ARRAYSIZE];
double elevation[ARRAYSIZE];
double distance[ARRAYSIZE];
int length;
} path;
struct dem { int min_north;
int max_north;
int min_west;
int max_west;
int max_el;
int min_el;
short data[IPPD][IPPD];
unsigned char mask[IPPD][IPPD];
unsigned char signal[IPPD][IPPD];
} dem[MAXPAGES];
struct LR { double eps_dielect;
double sgm_conductivity;
double eno_ns_surfref;
double frq_mhz;
double conf;
double rel;
double erp;
int radio_climate;
int pol;
float antenna_pattern[361][1001];
} LR;
struct region { unsigned char color[32][3];
int level[32];
int levels;
} region;
double elev[ARRAYSIZE+10];
void point_to_point(double elev[], double tht_m, double rht_m,
double eps_dielect, double sgm_conductivity, double eno_ns_surfref,
double frq_mhz, int radio_climate, int pol, double conf,
double rel, double &dbloss, char *strmode, int &errnum);
double arccos(double x, double y)
{
/* This function implements the arc cosine function,
returning a value between 0 and TWOPI. */
double result=0.0;
if (y>0.0)
result=acos(x/y);
if (y<0.0)
result=PI+acos(x/y);
return result;
}
int ReduceAngle(double angle)
{
/* This function normalizes the argument to
an integer angle between 0 and 180 degrees */
double temp;
temp=acos(cos(angle*DEG2RAD));
return (int)rint(temp/DEG2RAD);
}
double LonDiff(double lon1, double lon2)
{
/* This function returns the short path longitudinal
difference between longitude1 and longitude2
as an angle between -180.0 and +180.0 degrees.
If lon1 is west of lon2, the result is positive.
If lon1 is east of lon2, the result is negative. */
double diff;
diff=lon1-lon2;
if (diff<=-180.0)
diff+=360.0;
if (diff>=180.0)
diff-=360.0;
return diff;
}
char *dec2dms(double decimal)
{
/* Converts decimal degrees to degrees, minutes, seconds,
(DMS) and returns the result as a character string. */
char sign;
int degrees, minutes, seconds;
double a, b, c, d;
if (decimal<0.0)
{
decimal=-decimal;
sign=-1;
}
else
sign=1;
a=floor(decimal);
b=60.0*(decimal-a);
c=floor(b);
d=60.0*(b-c);
degrees=(int)a;
minutes=(int)c;
seconds=(int)d;
if (seconds<0)
seconds=0;
if (seconds>59)
seconds=59;
string[0]=0;
snprintf(string,250,"%d%c %d\' %d\"", degrees*sign, 176, minutes, seconds);
return (string);
}
int OrMask(double lat, double lon, int value)
{
int x, y, indx;
char found;
for (indx=0, found=0; indx<MAXPAGES && found==0;)
{
x=(int)rint(ppd*(lat-dem[indx].min_north));
y=mpi-(int)rint(ppd*(LonDiff(dem[indx].max_west,lon)));
if (x>=0 && x<=mpi && y>=0 && y<=mpi)
found=1;
else
indx++;
}
if (found)
{
dem[indx].mask[x][y]|=value;
return ((int)dem[indx].mask[x][y]);
}
else
return -1;
}
double GetElevation(struct site location)
{
/* This function returns the elevation (in feet) of any location
represented by the digital elevation model data in memory.
Function returns -5000.0 for locations not found in memory. */
char found;
int x, y, indx;
double elevation;
for (indx=0, found=0; indx<MAXPAGES && found==0;)
{
x=(int)rint(ppd*(location.lat-dem[indx].min_north));
y=mpi-(int)rint(ppd*(LonDiff(dem[indx].max_west,location.lon)));
if (x>=0 && x<=mpi && y>=0 && y<=mpi)
found=1;
else
indx++;
}
if (found)
elevation=3.28084*dem[indx].data[x][y];
else
elevation=-5000.0;
return elevation;
}
int AddElevation(double lat, double lon, double height)
{
/* This function adds a user-defined terrain feature
(in meters AGL) to the digital elevation model data
in memory. Does nothing and returns 0 for locations
not found in memory. */
char found;
int x, y, indx;
for (indx=0, found=0; indx<MAXPAGES && found==0;)
{
x=(int)rint(ppd*(lat-dem[indx].min_north));
y=mpi-(int)rint(ppd*(LonDiff(dem[indx].max_west,lon)));
if (x>=0 && x<=mpi && y>=0 && y<=mpi)
found=1;
else
indx++;
}
if (found)
dem[indx].data[x][y]+=(short)rint(height);
return found;
}
double Distance(struct site site1, struct site site2)
{
/* This function returns the great circle distance
in miles between any two site locations. */
double lat1, lon1, lat2, lon2, distance;
lat1=site1.lat*DEG2RAD;
lon1=site1.lon*DEG2RAD;
lat2=site2.lat*DEG2RAD;
lon2=site2.lon*DEG2RAD;
distance=3959.0*acos(sin(lat1)*sin(lat2)+cos(lat1)*cos(lat2)*cos((lon1)-(lon2)));
return distance;
}
double Azimuth(struct site source, struct site destination)
{
/* This function returns the azimuth (in degrees) to the
destination as seen from the location of the source. */
double dest_lat, dest_lon, src_lat, src_lon,
beta, azimuth, diff, num, den, fraction;
dest_lat=destination.lat*DEG2RAD;
dest_lon=destination.lon*DEG2RAD;
src_lat=source.lat*DEG2RAD;
src_lon=source.lon*DEG2RAD;
/* Calculate Surface Distance */
beta=acos(sin(src_lat)*sin(dest_lat)+cos(src_lat)*cos(dest_lat)*cos(src_lon-dest_lon));
/* Calculate Azimuth */
num=sin(dest_lat)-(sin(src_lat)*cos(beta));
den=cos(src_lat)*sin(beta);
fraction=num/den;
/* Trap potential problems in acos() due to rounding */
if (fraction>=1.0)
fraction=1.0;
if (fraction<=-1.0)
fraction=-1.0;
/* Calculate azimuth */
azimuth=acos(fraction);
/* Reference it to True North */
diff=dest_lon-src_lon;
if (diff<=-PI)
diff+=TWOPI;
if (diff>=PI)
diff-=TWOPI;
if (diff>0.0)
azimuth=TWOPI-azimuth;
return (azimuth/DEG2RAD);
}
double ElevationAngle(struct site source, struct site destination)
{
/* This function returns the angle of elevation (in degrees)
of the destination as seen from the source location.
A positive result represents an angle of elevation (uptilt),
while a negative result represents an angle of depression
(downtilt), as referenced to a normal to the center of
the earth. */
register double a, b, dx;
a=GetElevation(destination)+destination.alt+earthradius;
b=GetElevation(source)+source.alt+earthradius;
dx=5280.0*Distance(source,destination);
/* Apply the Law of Cosines */
return ((180.0*(acos(((b*b)+(dx*dx)-(a*a))/(2.0*b*dx)))/PI)-90.0);
}
void ReadPath(struct site source, struct site destination)
{
/* This function generates a sequence of latitude and
longitude positions between source and destination
locations along a great circle path, and stores
elevation and distance information for points
along that path in the "path" structure. */
int c;
double azimuth, distance, lat1, lon1, beta, den, num,
lat2, lon2, total_distance, dx, dy, path_length,
miles_per_sample, samples_per_radian=68755.0;
struct site tempsite;
lat1=source.lat*DEG2RAD;
lon1=source.lon*DEG2RAD;
lat2=destination.lat*DEG2RAD;
lon2=destination.lon*DEG2RAD;
if (ppd==1200.0)
samples_per_radian=68755.0;
if (ppd==3600.0)
samples_per_radian=206265.0;
azimuth=Azimuth(source,destination)*DEG2RAD;
total_distance=Distance(source,destination);
if (total_distance>(30.0/ppd)) /* > 0.5 pixel distance */
{
dx=samples_per_radian*acos(cos(lon1-lon2));
dy=samples_per_radian*acos(cos(lat1-lat2));
path_length=sqrt((dx*dx)+(dy*dy)); /* Total number of samples */
miles_per_sample=total_distance/path_length; /* Miles per sample */
}
else
{
c=0;
dx=0.0;
dy=0.0;
path_length=0.0;
miles_per_sample=0.0;
total_distance=0.0;
lat1=lat1/DEG2RAD;
lon1=lon1/DEG2RAD;
path.lat[c]=lat1;
path.lon[c]=lon1;
path.elevation[c]=GetElevation(source);
path.distance[c]=0.0;
}
for (distance=0.0, c=0; (total_distance!=0.0 && distance<=total_distance && c<ARRAYSIZE); c++, distance=miles_per_sample*(double)c)
{
beta=distance/3959.0;
lat2=asin(sin(lat1)*cos(beta)+cos(azimuth)*sin(beta)*cos(lat1));
num=cos(beta)-(sin(lat1)*sin(lat2));
den=cos(lat1)*cos(lat2);
if (azimuth==0.0 && (beta>HALFPI-lat1))
lon2=lon1+PI;
else if (azimuth==HALFPI && (beta>HALFPI+lat1))
lon2=lon1+PI;
else if (fabs(num/den)>1.0)
lon2=lon1;
else
{
if ((PI-azimuth)>=0.0)
lon2=lon1-arccos(num,den);
else
lon2=lon1+arccos(num,den);
}
while (lon2<0.0)
lon2+=TWOPI;
while (lon2>TWOPI)
lon2-=TWOPI;
lat2=lat2/DEG2RAD;
lon2=lon2/DEG2RAD;
path.lat[c]=lat2;
path.lon[c]=lon2;
tempsite.lat=lat2;
tempsite.lon=lon2;
path.elevation[c]=GetElevation(tempsite);
path.distance[c]=distance;
}
/* Make sure exact destination point is recorded at path.length-1 */
if (c<ARRAYSIZE)
{
path.lat[c]=destination.lat;
path.lon[c]=destination.lon;
path.elevation[c]=GetElevation(destination);
path.distance[c]=total_distance;
c++;
}
if (c<ARRAYSIZE)
path.length=c;
else
path.length=ARRAYSIZE-1;
}
double ElevationAngle2(struct site source, struct site destination, double er)
{
/* This function returns the angle of elevation (in degrees)
of the destination as seen from the source location, UNLESS
the path between the sites is obstructed, in which case, the
elevation angle to the first obstruction is returned instead.
"er" represents the earth radius. */
int x;
char block=0;
double source_alt, destination_alt, cos_xmtr_angle,
cos_test_angle, test_alt, elevation, distance,
source_alt2, first_obstruction_angle=0.0;
struct path temp;
temp=path;
ReadPath(source,destination);
distance=5280.0*Distance(source,destination);
source_alt=er+source.alt+GetElevation(source);
destination_alt=er+destination.alt+GetElevation(destination);
source_alt2=source_alt*source_alt;
/* Calculate the cosine of the elevation angle of the
destination (receiver) as seen by the source (transmitter). */
cos_xmtr_angle=((source_alt2)+(distance*distance)-(destination_alt*destination_alt))/(2.0*source_alt*distance);
/* Test all points in between source and destination locations to
see if the angle to a topographic feature generates a higher
elevation angle than that produced by the destination. Begin
at the source since we're interested in identifying the FIRST
obstruction along the path between source and destination. */
for (x=2, block=0; x<path.length && block==0; x++)
{
distance=5280.0*path.distance[x];
test_alt=earthradius+(path.elevation[x]==0.0?path.elevation[x]:path.elevation[x]+clutter);
cos_test_angle=((source_alt2)+(distance*distance)-(test_alt*test_alt))/(2.0*source_alt*distance);
/* Compare these two angles to determine if
an obstruction exists. Since we're comparing
the cosines of these angles rather than
the angles themselves, the sense of the
following "if" statement is reversed from
what it would be if the angles themselves
were compared. */
if (cos_xmtr_angle>=cos_test_angle)
{
block=1;
first_obstruction_angle=((acos(cos_test_angle))/DEG2RAD)-90.0;
}
}
if (block)
elevation=first_obstruction_angle;
else
elevation=((acos(cos_xmtr_angle))/DEG2RAD)-90.0;
path=temp;
return elevation;
}
double AverageTerrain(struct site source, double azimuthx, double start_distance, double end_distance)
{
/* This function returns the average terrain calculated in
the direction of "azimuth" (degrees) between "start_distance"
and "end_distance" (miles) from the source location. If
the terrain is all water (non-critical error), -5000.0 is
returned. If not enough SDF data has been loaded into
memory to complete the survey (critical error), then
-9999.0 is returned. */
int c, samples, endpoint;
double beta, lat1, lon1, lat2, lon2, num, den, azimuth, terrain=0.0;
struct site destination;
lat1=source.lat*DEG2RAD;
lon1=source.lon*DEG2RAD;
/* Generate a path of elevations between the source
location and the remote location provided. */
beta=end_distance/3959.0;
azimuth=DEG2RAD*azimuthx;
lat2=asin(sin(lat1)*cos(beta)+cos(azimuth)*sin(beta)*cos(lat1));
num=cos(beta)-(sin(lat1)*sin(lat2));
den=cos(lat1)*cos(lat2);
if (azimuth==0.0 && (beta>HALFPI-lat1))
lon2=lon1+PI;
else if (azimuth==HALFPI && (beta>HALFPI+lat1))
lon2=lon1+PI;
else if (fabs(num/den)>1.0)
lon2=lon1;
else
{
if ((PI-azimuth)>=0.0)
lon2=lon1-arccos(num,den);
else
lon2=lon1+arccos(num,den);
}
while (lon2<0.0)
lon2+=TWOPI;
while (lon2>TWOPI)
lon2-=TWOPI;
lat2=lat2/DEG2RAD;
lon2=lon2/DEG2RAD;
destination.lat=lat2;
destination.lon=lon2;
/* If SDF data is missing for the endpoint of
the radial, then the average terrain cannot
be accurately calculated. Return -9999.0 */
if (GetElevation(destination)<-4999.0)
return (-9999.0);
else
{
ReadPath(source,destination);
endpoint=path.length;
/* Shrink the length of the radial if the
outermost portion is not over U.S. land. */
for (c=endpoint-1; c>=0 && path.elevation[c]==0.0; c--);
endpoint=c+1;
for (c=0, samples=0; c<endpoint; c++)
{
if (path.distance[c]>=start_distance)
{
terrain+=(path.elevation[c]==0.0?path.elevation[c]:path.elevation[c]+clutter);
samples++;
}
}
if (samples==0)
terrain=-5000.0; /* No land */
else
terrain=(terrain/(double)samples);
return terrain;
}
}
double haat(struct site antenna)
{
/* This function returns the antenna's Height Above Average
Terrain (HAAT) based on FCC Part 73.313(d). If a critical
error occurs, such as a lack of SDF data to complete the
survey, -5000.0 is returned. */
int azi, c;
char error=0;
double terrain, avg_terrain, haat, sum=0.0;
/* Calculate the average terrain between 2 and 10 miles
from the antenna site at azimuths of 0, 45, 90, 135,
180, 225, 270, and 315 degrees. */
for (c=0, azi=0; azi<=315 && error==0; azi+=45)
{
terrain=AverageTerrain(antenna, (double)azi, 2.0, 10.0);
if (terrain<-9998.0) /* SDF data is missing */
error=1;
if (terrain>-4999.0) /* It's land, not water */
{
sum+=terrain; /* Sum of averages */
c++;
}
}
if (error)
return -5000.0;
else
{
avg_terrain=(sum/(double)c);
haat=(antenna.alt+GetElevation(antenna))-avg_terrain;
return haat;
}
}
double ReadBearing(char *input)
{
/* This function takes numeric input in the form of a character
string, and returns an equivalent bearing in degrees as a
decimal number (double). The input may either be expressed
in decimal format (40.139722) or degree, minute, second
format (40 08 23). This function also safely handles
extra spaces found either leading, trailing, or
embedded within the numbers expressed in the
input string. Decimal seconds are permitted. */
double seconds, bearing=0.0;
char string[20];
int a, b, length, degrees, minutes;
/* Copy "input" to "string", and ignore any extra
spaces that might be present in the process. */
string[0]=0;
length=strlen(input);
for (a=0, b=0; a<length && a<18; a++)
{
if ((input[a]!=32 && input[a]!='\n') || (input[a]==32 && input[a+1]!=32 && input[a+1]!='\n' && b!=0))
{
string[b]=input[a];
b++;
}
}
string[b]=0;
/* Count number of spaces in the clean string. */
length=strlen(string);
for (a=0, b=0; a<length; a++)
if (string[a]==32)
b++;
if (b==0) /* Decimal Format (40.139722) */
sscanf(string,"%lf",&bearing);
if (b==2) /* Degree, Minute, Second Format (40 08 23.xx) */
{
sscanf(string,"%d %d %lf",&degrees, &minutes, &seconds);
bearing=fabs((double)degrees);
bearing+=fabs(((double)minutes)/60.0);
bearing+=fabs(seconds/3600.0);
if ((degrees<0) || (minutes<0) || (seconds<0.0))
bearing=-bearing;
}
/* Anything else returns a 0.0 */
if (bearing>360.0 || bearing<-360.0)
bearing=0.0;
return bearing;
}
int LoadSDF_SDF(char *name,int winfiles)
{
int x, y, data, indx, minlat, minlon, maxlat, maxlon;
char found, free_page=0, line[20], sdf_file[255],
path_plus_name[255], *s=NULL;
FILE *fd;
for (x=0; name[x]!='.' && name[x]!=0 && x<250; x++)
sdf_file[x]=name[x];
sdf_file[x]=0;
/* Parse filename for minimum latitude and longitude values */
if(winfiles==1){
sscanf(sdf_file,"%d=%d=%d=%d",&minlat,&maxlat,&minlon,&maxlon);
}else{
sscanf(sdf_file,"%d:%d:%d:%d",&minlat,&maxlat,&minlon,&maxlon);
}
sdf_file[x]='.';
sdf_file[x+1]='s';
sdf_file[x+2]='d';
sdf_file[x+3]='f';
sdf_file[x+4]=0;
/* Is it already in memory? */
for (indx=0, found=0; indx<MAXPAGES && found==0; indx++)
{
if (minlat==dem[indx].min_north && minlon==dem[indx].min_west && maxlat==dem[indx].max_north && maxlon==dem[indx].max_west)
found=1;
}
/* Is room available to load it? */
if (found==0)
{
for (indx=0, free_page=0; indx<MAXPAGES && free_page==0; indx++)
if (dem[indx].max_north==-90)
free_page=1;
}
indx--;
if (free_page && found==0 && indx>=0 && indx<MAXPAGES)
{
/* Search for SDF file in current working directory first */
strncpy(path_plus_name,sdf_file,255);
fd=fopen(path_plus_name,"rb");
if (fd==NULL)
{
strncpy(path_plus_name,sdf_path,255);
strncat(path_plus_name,sdf_file,255);
fd=fopen(path_plus_name,"rb");
}
if (fd!=NULL)
{
s=fgets(line,19,fd);
sscanf(line,"%d",&dem[indx].max_west);
s=fgets(line,19,fd);
sscanf(line,"%d",&dem[indx].min_north);
s=fgets(line,19,fd);
sscanf(line,"%d",&dem[indx].min_west);
s=fgets(line,19,fd);
sscanf(line,"%d",&dem[indx].max_north);
for (x=0; x<ippd; x++)
for (y=0; y<ippd; y++)
{
s=fgets(line,19,fd);
data=atoi(line);
dem[indx].data[x][y]=data;
dem[indx].signal[x][y]=0;
dem[indx].mask[x][y]=0;
if (data>dem[indx].max_el)
dem[indx].max_el=data;
if (data<dem[indx].min_el)
dem[indx].min_el=data;
}
fclose(fd);
if (dem[indx].min_el<min_elevation)
min_elevation=dem[indx].min_el;
if (dem[indx].max_el>max_elevation)
max_elevation=dem[indx].max_el;
if (max_north==-90)
max_north=dem[indx].max_north;
else if (dem[indx].max_north>max_north)
max_north=dem[indx].max_north;
if (min_north==90)
min_north=dem[indx].min_north;
else if (dem[indx].min_north<min_north)
min_north=dem[indx].min_north;
if (max_west==-1)
max_west=dem[indx].max_west;
else
{
if (abs(dem[indx].max_west-max_west)<180)
{
if (dem[indx].max_west>max_west)
max_west=dem[indx].max_west;
}
else
{
if (dem[indx].max_west<max_west)
max_west=dem[indx].max_west;
}
}
if (min_west==360)
min_west=dem[indx].min_west;
else
{
if (fabs(dem[indx].min_west-min_west)<180.0)
{
if (dem[indx].min_west<min_west)
min_west=dem[indx].min_west;
}
else
{
if (dem[indx].min_west>min_west)
min_west=dem[indx].min_west;
}
}
return 1;
}
else
return -1;
}
else
return 0;
}
char LoadSDF(char *name, int winfiles)
{
/* This function loads the requested SDF file from the filesystem.
It first tries to invoke the LoadSDF_SDF() function to load an
uncompressed SDF file (since uncompressed files load slightly
faster). If that attempt fails, then it tries to load a
compressed SDF file by invoking the LoadSDF_BZ() function.
If that fails, then we can assume that no elevation data
exists for the region requested, and that the region
requested must be entirely over water. */
int x, y, indx, minlat, minlon, maxlat, maxlon;
char found, free_page=0;
int return_value=-1;
/* Try to load an uncompressed SDF first. */
return_value=LoadSDF_SDF(name,winfiles);
/* If neither format can be found, then assume the area is water. */
if (return_value==0 || return_value==-1)
{
if(winfiles==1){
sscanf(name,"%d=%d=%d=%d",&minlat,&maxlat,&minlon,&maxlon);
}else{
sscanf(name,"%d:%d:%d:%d",&minlat,&maxlat,&minlon,&maxlon);
}
/* Is it already in memory? */
for (indx=0, found=0; indx<MAXPAGES && found==0; indx++)
{
if (minlat==dem[indx].min_north && minlon==dem[indx].min_west && maxlat==dem[indx].max_north && maxlon==dem[indx].max_west)
found=1;
}
/* Is room available to load it? */
if (found==0)
{
for (indx=0, free_page=0; indx<MAXPAGES && free_page==0; indx++)
if (dem[indx].max_north==-90)
free_page=1;
}
indx--;
if (free_page && found==0 && indx>=0 && indx<MAXPAGES)
{
fprintf(stdout,"Region \"%s\" assumed as sea-level into page %d...",name,indx+1);
fflush(stdout);
dem[indx].max_west=maxlon;
dem[indx].min_north=minlat;
dem[indx].min_west=minlon;
dem[indx].max_north=maxlat;
/* Fill DEM with sea-level topography */
for (x=0; x<ippd; x++)
for (y=0; y<ippd; y++)
{
dem[indx].data[x][y]=0;
dem[indx].signal[x][y]=0;
dem[indx].mask[x][y]=0;
if (dem[indx].min_el>0)
dem[indx].min_el=0;
}
if (dem[indx].min_el<min_elevation)
min_elevation=dem[indx].min_el;
if (dem[indx].max_el>max_elevation)
max_elevation=dem[indx].max_el;
if (max_north==-90)
max_north=dem[indx].max_north;
else if (dem[indx].max_north>max_north)
max_north=dem[indx].max_north;
if (min_north==90)
min_north=dem[indx].min_north;
else if (dem[indx].min_north<min_north)
min_north=dem[indx].min_north;
if (max_west==-1)
max_west=dem[indx].max_west;
else
{
if (abs(dem[indx].max_west-max_west)<180)
{
if (dem[indx].max_west>max_west)
max_west=dem[indx].max_west;
}
else
{
if (dem[indx].max_west<max_west)
max_west=dem[indx].max_west;
}
}
if (min_west==360)
min_west=dem[indx].min_west;
else
{
if (abs(dem[indx].min_west-min_west)<180)
{
if (dem[indx].min_west<min_west)
min_west=dem[indx].min_west;
}
else
{
if (dem[indx].min_west>min_west)
min_west=dem[indx].min_west;
}
}
fprintf(stdout," Done!\n");
fflush(stdout);
return_value=1;
}
}
return return_value;
}
int GetMask(double lat, double lon)
{
/* This function returns the mask bits based on the latitude
and longitude given. */
return (OrMask(lat,lon,0));
}
void PlotPath(struct site source, struct site destination, char mask_value)
{
/* This function analyzes the path between the source and
destination locations. It determines which points along
the path have line-of-sight visibility to the source.
Points along with path having line-of-sight visibility
to the source at an AGL altitude equal to that of the
destination location are stored by setting bit 1 in the
mask[][] array, which are displayed in green when PPM
maps are later generated by SPLAT!. */
char block;
int x, y;
register double cos_xmtr_angle, cos_test_angle, test_alt;
double distance, rx_alt, tx_alt;
ReadPath(source,destination);
for (y=0; y<path.length; y++)
{
/* Test this point only if it hasn't been already
tested and found to be free of obstructions. */
if ((GetMask(path.lat[y],path.lon[y])&mask_value)==0)
{
distance=5280.0*path.distance[y];
tx_alt=earthradius+source.alt+path.elevation[0];
rx_alt=earthradius+destination.alt+path.elevation[y];
/* Calculate the cosine of the elevation of the
transmitter as seen at the temp rx point. */
cos_xmtr_angle=((rx_alt*rx_alt)+(distance*distance)-(tx_alt*tx_alt))/(2.0*rx_alt*distance);
for (x=y, block=0; x>=0 && block==0; x--)
{
distance=5280.0*(path.distance[y]-path.distance[x]);
test_alt=earthradius+(path.elevation[x]==0.0?path.elevation[x]:path.elevation[x]+clutter);
cos_test_angle=((rx_alt*rx_alt)+(distance*distance)-(test_alt*test_alt))/(2.0*rx_alt*distance);
/* Compare these two angles to determine if
an obstruction exists. Since we're comparing
the cosines of these angles rather than
the angles themselves, the following "if"
statement is reversed from what it would
be if the actual angles were compared. */
if (cos_xmtr_angle>=cos_test_angle)
block=1;
}
if (block==0)
OrMask(path.lat[y],path.lon[y],mask_value);
}
}
}
void GraphHeight(struct site source, struct site destination, char *name, unsigned char fresnel_plot, unsigned char normalized, int pngwidth, int pngheight)
{
/* This function invokes gnuplot to generate an appropriate
output file indicating the terrain height profile between
the source and destination locations referenced to the
line-of-sight path between the receive and transmit sites
when the -h or -H command line option is used. "basename"
is the name assigned to the output file generated by gnuplot.
The filename extension is used to set gnuplot's terminal
setting and output file type. If no extension is found,
.png is assumed. */
int x, y, z;
char basename[255], term[30], ext[15];
double a, b, c, height=0.0, refangle, cangle, maxheight=-100000.0,
minheight=100000.0, lambda=0.0, f_zone=0.0, fpt6_zone=0.0,
nm=0.0, nb=0.0, ed=0.0, es=0.0, r=0.0, d=0.0, d1=0.0,
terrain, azimuth, distance, dheight=0.0, minterrain=100000.0,
minearth=100000.0, miny, maxy, min2y, max2y;
struct site remote;
FILE *fd=NULL, *fd1=NULL, *fd2=NULL, *fd3=NULL, *fd4=NULL, *fd5=NULL;
ReadPath(destination,source); /* destination=RX, source=TX */
azimuth=Azimuth(destination,source);
distance=Distance(destination,source);
refangle=ElevationAngle(destination,source);
b=GetElevation(destination)+destination.alt+earthradius;
/* Wavelength and path distance (great circle) in feet. */
//LR.frq_mhz = freq;
if (fresnel_plot)
{
lambda=9.8425e8/(LR.frq_mhz*1e6);
d=5280.0*path.distance[path.length-1];
}
if (normalized)
{
ed=GetElevation(destination);
es=GetElevation(source);
nb=-destination.alt-ed;
nm=(-source.alt-es-nb)/(path.distance[path.length-1]);
}
fd=fopen("profile.gp","wb");
if (clutter>0.0)
fd1=fopen("clutter.gp","wb");
fd2=fopen("reference.gp","wb");
fd5=fopen("curvature.gp", "wb");
if ((LR.frq_mhz>=20.0) && (LR.frq_mhz<=100000.0) && fresnel_plot)
{
fd3=fopen("fresnel.gp", "wb");
fd4=fopen("fresnel_pt_6.gp", "wb");
}
for (x=0; x<path.length-1; x++)
{
remote.lat=path.lat[x];
remote.lon=path.lon[x];
remote.alt=0.0;
terrain=GetElevation(remote);
if (x==0)
terrain+=destination.alt; /* RX antenna spike */
a=terrain+earthradius;
cangle=5280.0*Distance(destination,remote)/earthradius;
c=b*sin(refangle*DEG2RAD+HALFPI)/sin(HALFPI-refangle*DEG2RAD-cangle);
height=a-c;
/* Per Fink and Christiansen, Electronics
* Engineers' Handbook, 1989:
*
* H = sqrt(lamba * d1 * (d - d1)/d)
*
* where H is the distance from the LOS
* path to the first Fresnel zone boundary.
*/
if ((LR.frq_mhz>=20.0) && (LR.frq_mhz<=100000.0) && fresnel_plot)
{
d1=5280.0*path.distance[x];
f_zone=-1.0*sqrt(lambda*d1*(d-d1)/d);
fpt6_zone=f_zone*fzone_clearance;
}
if (normalized)
{
r=-(nm*path.distance[x])-nb;
height+=r;
if ((LR.frq_mhz>=20.0) && (LR.frq_mhz<=100000.0) && fresnel_plot)
{
f_zone+=r;
fpt6_zone+=r;
}
}
else
r=0.0;
if (metric)
{
//segfault here
fprintf(fd,"%f\t%f\n",KM_PER_MILE*path.distance[x],METERS_PER_FOOT*height);
if (fd1!=NULL && x>0 && x<path.length-2)
fprintf(fd1,"%f\t%f\n",KM_PER_MILE*path.distance[x],METERS_PER_FOOT*(terrain==0.0?height:(height+clutter)));
fprintf(fd2,"%f\t%f\n",KM_PER_MILE*path.distance[x],METERS_PER_FOOT*r);
fprintf(fd5,"%f\t%f\n",KM_PER_MILE*path.distance[x],METERS_PER_FOOT*(height-terrain));
}
else
{
fprintf(fd,"%f\t%f\n",path.distance[x],height);
if (fd1!=NULL && x>0 && x<path.length-2)
fprintf(fd1,"%f\t%f\n",path.distance[x],(terrain==0.0?height:(height+clutter)));
fprintf(fd2,"%f\t%f\n",path.distance[x],r);
fprintf(fd5,"%f\t%f\n",path.distance[x],height-terrain);
}
if ((LR.frq_mhz>=20.0) && (LR.frq_mhz<=100000.0) && fresnel_plot)
{
if (metric)
{
fprintf(fd3,"%f\t%f\n",KM_PER_MILE*path.distance[x],METERS_PER_FOOT*f_zone);
fprintf(fd4,"%f\t%f\n",KM_PER_MILE*path.distance[x],METERS_PER_FOOT*fpt6_zone);
}
else
{
fprintf(fd3,"%f\t%f\n",path.distance[x],f_zone);
fprintf(fd4,"%f\t%f\n",path.distance[x],fpt6_zone);
}
if (f_zone<minheight)
minheight=f_zone;
}
if ((height+clutter)>maxheight)
maxheight=height+clutter;
if (height<minheight)
minheight=height;
if (r>maxheight)
maxheight=r;
if (terrain<minterrain)
minterrain=terrain;
if ((height-terrain)<minearth)
minearth=height-terrain;
}
if (normalized)
r=-(nm*path.distance[path.length-1])-nb;
else
r=0.0;
if (metric)
{
fprintf(fd,"%f\t%f\n",KM_PER_MILE*path.distance[path.length-1],METERS_PER_FOOT*r);
fprintf(fd2,"%f\t%f\n",KM_PER_MILE*path.distance[path.length-1],METERS_PER_FOOT*r);
}
else
{
fprintf(fd,"%f\t%f\n",path.distance[path.length-1],r);
fprintf(fd2,"%f\t%f\n",path.distance[path.length-1],r);
}
if ((LR.frq_mhz>=20.0) && (LR.frq_mhz<=100000.0) && fresnel_plot)
{
if (metric)
{
fprintf(fd3,"%f\t%f\n",KM_PER_MILE*path.distance[path.length-1],METERS_PER_FOOT*r);
fprintf(fd4,"%f\t%f\n",KM_PER_MILE*path.distance[path.length-1],METERS_PER_FOOT*r);
}
else
{
fprintf(fd3,"%f\t%f\n",path.distance[path.length-1],r);
fprintf(fd4,"%f\t%f\n",path.distance[path.length-1],r);
}
}
if (r>maxheight)
maxheight=r;
if (r<minheight)
minheight=r;
fclose(fd);
if (fd1!=NULL)
fclose(fd1);
fclose(fd2);
fclose(fd5);
if ((LR.frq_mhz>=20.0) && (LR.frq_mhz<=100000.0) && fresnel_plot)
{
fclose(fd3);
fclose(fd4);
}
if (name[0]=='.')
{
/* Default filename and output file type */
strncpy(basename,"profile\0",8);
strncpy(term,"png\0",4);
strncpy(ext,"png\0",4);
}
else
{
/* Extract extension and terminal type from "name" */
ext[0]=0;
y=strlen(name);
strncpy(basename,name,254);
for (x=y-1; x>0 && name[x]!='.'; x--);
if (x>0) /* Extension found */
{
for (z=x+1; z<=y && (z-(x+1))<10; z++)
{
ext[z-(x+1)]=tolower(name[z]);
term[z-(x+1)]=name[z];
}
ext[z-(x+1)]=0; /* Ensure an ending 0 */
term[z-(x+1)]=0;
basename[x]=0;
}
if (ext[0]==0) /* No extension -- Default is png */
{
strncpy(term,"png\0",4);
strncpy(ext,"png\0",4);
}
}
/* Either .ps or .postscript may be used
as an extension for postscript output. */
if (strncmp(term,"postscript",10)==0)
strncpy(ext,"ps\0",3);
else if (strncmp(ext,"ps",2)==0)
strncpy(term,"postscript enhanced color\0",26);
fd=fopen("ppa.gp","w");
dheight=maxheight-minheight;
miny=minheight-0.15*dheight;
maxy=maxheight+0.05*dheight;
if (maxy<20.0)
maxy=20.0;
dheight=maxheight-minheight;
min2y=miny-minterrain+0.05*dheight;
if (minearth<min2y)
{
miny-=min2y-minearth+0.05*dheight;
min2y=minearth-0.05*dheight;
}
max2y=min2y+maxy-miny;
fprintf(fd,"set grid\n");
fprintf(fd,"set yrange [%2.3f to %2.3f]\n", metric?miny*METERS_PER_FOOT:miny, metric?maxy*METERS_PER_FOOT:maxy);
fprintf(fd,"set y2range [%2.3f to %2.3f]\n", metric?min2y*METERS_PER_FOOT:min2y, metric?max2y*METERS_PER_FOOT:max2y);
fprintf(fd,"set xrange [-0.5 to %2.3f]\n",metric?KM_PER_MILE*rint(distance+0.5):rint(distance+0.5));
fprintf(fd,"set encoding iso_8859_1\n");
fprintf(fd,"set term %s size %d, %d\n",term,pngwidth,pngheight);
if ((LR.frq_mhz>=20.0) && (LR.frq_mhz<=100000.0) && fresnel_plot)
fprintf(fd,"set title \"Link from %s to %s (%.2f%c)\"\n",source.name, destination.name, azimuth,176);
else
fprintf(fd,"set title Height Profile Between %s and %s (%.2f%c)\"\n", source.name, destination.name, azimuth,176);
if (metric)
fprintf(fd,"set xlabel \"Distance: %.2f Km Path Loss: %.2f dB Received Power: %.2f dBm\"\n",KM_PER_MILE*Distance(source,destination),loss,dBm);
else
fprintf(fd,"set xlabel \"Distance: %.2f Mi Path Loss: %.2f dB Received Power: %.2f dBm\"\n",Distance(source,destination),loss,dBm);
if (metric)
fprintf(fd,"set ylabel \"Height (meters)\"\n");
else
fprintf(fd,"set ylabel \"Height (feet)\"\n");
fprintf(fd,"set output \"%s.%s\"\n",basename,ext);
if ((LR.frq_mhz>=20.0) && (LR.frq_mhz<=100000.0) && fresnel_plot)
{
if (clutter>0.0)
{
if (metric)
fprintf(fd,"plot \"profile.gp\" title \"Terrain Profile\" with filledcurve x1 lt 1 lc rgb \"#cbbc8a\", \"clutter.gp\" title \"Ground Clutter (%.2f meters)\" with lines, \"reference.gp\" title \"Line of Sight\" with lines, \"curvature.gp\" axes x1y2 title \"Earth's Curvature\" with lines, \"fresnel.gp\" axes x1y1 title \"First Fresnel Zone (%.3f MHz)\" with lines, \"fresnel_pt_6.gp\" title \"%.0f%% of Fresnel Zone\" with lines\n",clutter*METERS_PER_FOOT,LR.frq_mhz,fzone_clearance*100.0);
else
fprintf(fd,"plot \"profile.gp\" title \"Terrain Profile\" with filledcurve x1 lt 1 lc rgb \"#cbbc8a\", \"clutter.gp\" title \"Ground Clutter (%.2f feet)\" with lines, \"reference.gp\" title \"Line of Sight\" with lines, \"curvature.gp\" axes x1y2 title \"Earth's Curvature\" with lines, \"fresnel.gp\" axes x1y1 title \"First Fresnel Zone (%.3f MHz)\" with lines, \"fresnel_pt_6.gp\" title \"%.0f%% of Fresnel Zone\" with lines\n",clutter,LR.frq_mhz,fzone_clearance*100.0);
}
else
fprintf(fd,"plot \"profile.gp\" title \"Terrain\" with filledcurve x1 lt 1 lc rgb \"#cbbc8a\", \"reference.gp\" title \"Line of sight\" with lines, \"curvature.gp\" axes x1y2 title \"Earth's Curvature\" with lines, \"fresnel.gp\" axes x1y1 title \"Fresnel Zone for %.1f MHz\" with lines, \"fresnel_pt_6.gp\" title \"%.0f%% of Fresnel Zone\" with lines\n",LR.frq_mhz,fzone_clearance*100.0);
}
else
{
}
fclose(fd);
x=system("gnuplot ppa.gp");
if (x!=-1)
{
if (gpsav==0)
{
//unlink("ppa.gp");
//unlink("profile.gp");
//unlink("reference.gp");
//unlink("curvature.gp");
if (fd1!=NULL)
unlink("clutter.gp");
if ((LR.frq_mhz>=20.0) && (LR.frq_mhz<=100000.0) && fresnel_plot)
{
//unlink("fresnel.gp");
//unlink("fresnel_pt_6.gp");
}
}
}
else
fprintf(stderr,"\n*** ERROR: Error occurred invoking gnuplot!\n");
}
void ObstructionAnalysis(struct site xmtr, struct site rcvr, double f, FILE *outfile)
{
/* Perform an obstruction analysis along the
path between receiver and transmitter. */
int x;
struct site site_x;
double h_r, h_t, h_x, h_r_orig, cos_tx_angle, cos_test_angle,
cos_tx_angle_f1, cos_tx_angle_fpt6, d_tx, d_x,
h_r_f1, h_r_fpt6, h_f, h_los, lambda=0.0;
char string[255], string_fpt6[255], string_f1[255];
ReadPath(xmtr,rcvr);
h_r=GetElevation(rcvr)+rcvr.alt+earthradius;
h_r_f1=h_r;
h_r_fpt6=h_r;
h_r_orig=h_r;
h_t=GetElevation(xmtr)+xmtr.alt+earthradius;
d_tx=5280.0*Distance(rcvr,xmtr);
cos_tx_angle=((h_r*h_r)+(d_tx*d_tx)-(h_t*h_t))/(2.0*h_r*d_tx);
cos_tx_angle_f1=cos_tx_angle;
cos_tx_angle_fpt6=cos_tx_angle;
if (f)
lambda=9.8425e8/(f*1e6);
if (clutter>0.0)
{
fprintf(outfile,"Terrain has been raised by");
if (metric)
fprintf(outfile," %.2f meters",METERS_PER_FOOT*clutter);
else
fprintf(outfile," %.2f feet",clutter);
fprintf(outfile," to account for ground clutter.\n\n");
}
/* At each point along the path calculate the cosine
of a sort of "inverse elevation angle" at the receiver.
From the antenna, 0 deg. looks at the ground, and 90 deg.
is parallel to the ground.
Start at the receiver. If this is the lowest antenna,
then terrain obstructions will be nearest to it. (Plus,
that's the way ppa!'s original los() did it.)
Calculate cosines only. That's sufficient to compare
angles and it saves the extra computational burden of
acos(). However, note the inverted comparison: if
acos(A) > acos(B), then B > A. */
for (x=path.length-1; x>0; x--)
{
site_x.lat=path.lat[x];
site_x.lon=path.lon[x];
site_x.alt=0.0;
h_x=GetElevation(site_x)+earthradius+clutter;
d_x=5280.0*Distance(rcvr,site_x);
/* Deal with the LOS path first. */
cos_test_angle=((h_r*h_r)+(d_x*d_x)-(h_x*h_x))/(2.0*h_r*d_x);
if (cos_tx_angle>cos_test_angle)
{
if (h_r==h_r_orig)
fprintf(outfile,"Between %s and %s, %s detected obstructions at:\n\n",rcvr.name,xmtr.name,ppa_name);
if (site_x.lat>=0.0)
{
if (metric)
fprintf(outfile," %8.4f N,%9.4f W, %5.2f kilometers, %6.2f meters AMSL\n",site_x.lat, site_x.lon, KM_PER_MILE*(d_x/5280.0), METERS_PER_FOOT*(h_x-earthradius));
else
fprintf(outfile," %8.4f N,%9.4f W, %5.2f miles, %6.2f feet AMSL\n",site_x.lat, site_x.lon, d_x/5280.0, h_x-earthradius);
}
else
{
if (metric)
fprintf(outfile," %8.4f S,%9.4f W, %5.2f kilometers, %6.2f meters AMSL\n",-site_x.lat, site_x.lon, KM_PER_MILE*(d_x/5280.0), METERS_PER_FOOT*(h_x-earthradius));
else
fprintf(outfile," %8.4f S,%9.4f W, %5.2f miles, %6.2f feet AMSL\n",-site_x.lat, site_x.lon, d_x/5280.0, h_x-earthradius);
}
}
while (cos_tx_angle>cos_test_angle)
{
h_r+=1;
cos_test_angle=((h_r*h_r)+(d_x*d_x)-(h_x*h_x))/(2.0*h_r*d_x);
cos_tx_angle=((h_r*h_r)+(d_tx*d_tx)-(h_t*h_t))/(2.0*h_r*d_tx);
}
if (f)
{
/* Now clear the first Fresnel zone... */
cos_tx_angle_f1=((h_r_f1*h_r_f1)+(d_tx*d_tx)-(h_t*h_t))/(2.0*h_r_f1*d_tx);
h_los=sqrt(h_r_f1*h_r_f1+d_x*d_x-2*h_r_f1*d_x*cos_tx_angle_f1);
h_f=h_los-sqrt(lambda*d_x*(d_tx-d_x)/d_tx);
while (h_f<h_x)
{
h_r_f1+=1;
cos_tx_angle_f1=((h_r_f1*h_r_f1)+(d_tx*d_tx)-(h_t*h_t))/(2.0*h_r_f1*d_tx);
h_los=sqrt(h_r_f1*h_r_f1+d_x*d_x-2*h_r_f1*d_x*cos_tx_angle_f1);
h_f=h_los-sqrt(lambda*d_x*(d_tx-d_x)/d_tx);
}
/* and clear the 60% F1 zone. */
cos_tx_angle_fpt6=((h_r_fpt6*h_r_fpt6)+(d_tx*d_tx)-(h_t*h_t))/(2.0*h_r_fpt6*d_tx);
h_los=sqrt(h_r_fpt6*h_r_fpt6+d_x*d_x-2*h_r_fpt6*d_x*cos_tx_angle_fpt6);
h_f=h_los-fzone_clearance*sqrt(lambda*d_x*(d_tx-d_x)/d_tx);
while (h_f<h_x)
{
h_r_fpt6+=1;
cos_tx_angle_fpt6=((h_r_fpt6*h_r_fpt6)+(d_tx*d_tx)-(h_t*h_t))/(2.0*h_r_fpt6*d_tx);
h_los=sqrt(h_r_fpt6*h_r_fpt6+d_x*d_x-2*h_r_fpt6*d_x*cos_tx_angle_fpt6);
h_f=h_los-fzone_clearance*sqrt(lambda*d_x*(d_tx-d_x)/d_tx);
}
}
}
if (h_r>h_r_orig)
{
if (metric)
snprintf(string,150,"\nAntenna at %s must be raised to at least %.2f meters AGL\nto clear all obstructions detected by %s.\n",rcvr.name, METERS_PER_FOOT*(h_r-GetElevation(rcvr)-earthradius),ppa_name);
else
snprintf(string,150,"\nAntenna at %s must be raised to at least %.2f feet AGL\nto clear all obstructions detected by %s.\n",rcvr.name, h_r-GetElevation(rcvr)-earthradius,ppa_name);
}
else
snprintf(string,150,"\nNo obstructions to LOS path due to terrain were detected by %s\n",ppa_name);
if (f)
{
if (h_r_fpt6>h_r_orig)
{
if (metric)
snprintf(string_fpt6,150,"\nAntenna at %s must be raised to at least %.2f meters AGL\nto clear %.0f%c of the first Fresnel zone.\n",rcvr.name, METERS_PER_FOOT*(h_r_fpt6-GetElevation(rcvr)-earthradius),fzone_clearance*100.0,37);
else
snprintf(string_fpt6,150,"\nAntenna at %s must be raised to at least %.2f feet AGL\nto clear %.0f%c of the first Fresnel zone.\n",rcvr.name, h_r_fpt6-GetElevation(rcvr)-earthradius,fzone_clearance*100.0,37);
}
else
snprintf(string_fpt6,150,"\n%.0f%c of the first Fresnel zone is clear.\n",fzone_clearance*100.0,37);
if (h_r_f1>h_r_orig)
{
if (metric)
snprintf(string_f1,150,"\nAntenna at %s must be raised to at least %.2f meters AGL\nto clear the first Fresnel zone.\n",rcvr.name, METERS_PER_FOOT*(h_r_f1-GetElevation(rcvr)-earthradius));
else
snprintf(string_f1,150,"\nAntenna at %s must be raised to at least %.2f feet AGL\nto clear the first Fresnel zone.\n",rcvr.name, h_r_f1-GetElevation(rcvr)-earthradius);
}
else
snprintf(string_f1,150,"\nThe first Fresnel zone is clear.\n");
}
fprintf(outfile,"%s",string);
if (f)
{
fprintf(outfile,"%s",string_f1);
fprintf(outfile,"%s",string_fpt6);
}
}
void PathReport(struct site source, struct site destination, char *name, char graph_it)
{
/* This function writes a PPA Path Report (name.txt) to
the filesystem. If (graph_it == 1), then gnuplot is invoked
to generate an appropriate output file indicating the Longley-Rice
model loss between the source and destination locations.
"filename" is the name assigned to the output file generated
by gnuplot. The filename extension is used to set gnuplot's
terminal setting and output file type. If no extension is
found, .png is assumed. */
int x, y, z, errnum;
char basename[255], term[30], ext[15], strmode[100],
report_name[80], block=0;
double maxloss=-100000.0, minloss=100000.0, haavt,
angle1, angle2, azimuth, pattern=1.0, patterndB=0.0,
total_loss=0.0, cos_xmtr_angle, cos_test_angle=0.0,
source_alt, test_alt, dest_alt, source_alt2, dest_alt2,
distance, elevation, four_thirds_earth,
free_space_loss=0.0, eirp=0.0, voltage, rxp, power_density;
FILE *fd=NULL, *fd2=NULL;
//sprintf(report_name,"%s.txt",*name);
snprintf(report_name,80,"%s.txt%c",name,0);
four_thirds_earth=FOUR_THIRDS*EARTHRADIUS;
/*for (x=0; report_name[x]!=0; x++)
if (report_name[x]==32 || report_name[x]==17 || report_name[x]==92 || report_name[x]==42 || report_name[x]==47)
report_name[x]='_'; */
fd2=fopen(report_name,"w");
fprintf(fd2,"\n\t\t--==[ %s v%s Path Analysis ]==--\n\n",ppa_name,ppa_version);
//fprintf(fd2,"%s\n\n",dashes);
fprintf(fd2,"Transmitter site: %s\n",source.name);
if (source.lat>=0.0)
{
fprintf(fd2,"Site location: %.4f North / %.4f West",source.lat, source.lon);
//fprintf(fd2, " (%s N / ", source.lat);
}
else
{
fprintf(fd2,"Site location: %.4f South / %.4f West",-source.lat, source.lon);
//fprintf(fd2, " (%s S / ", source.lat);
}
//fprintf(fd2, "%s W)\n", source.lon);
if (metric)
{
fprintf(fd2,"Ground elevation: %.2f meters AMSL\n",METERS_PER_FOOT*GetElevation(source));
fprintf(fd2,"Antenna height: %.2f meters AGL / %.2f meters AMSL\n",METERS_PER_FOOT*source.alt,METERS_PER_FOOT*(source.alt+GetElevation(source)));
}
else
{
fprintf(fd2,"Ground elevation: %.2f feet AMSL\n",GetElevation(source));
fprintf(fd2,"Antenna height: %.2f feet AGL / %.2f feet AMSL\n",source.alt, source.alt+GetElevation(source));
}
/*
haavt=haat(source);
if (haavt>-4999.0)
{
if (metric)
fprintf(fd2,"Antenna height above average terrain: %.2f meters\n",METERS_PER_FOOT*haavt);
else
fprintf(fd2,"Antenna height above average terrain: %.2f feet\n",haavt);
}
*/
azimuth=Azimuth(source,destination);
angle1=ElevationAngle(source,destination);
angle2=ElevationAngle2(source,destination,earthradius);
if (got_azimuth_pattern || got_elevation_pattern)
{
x=(int)rint(10.0*(10.0-angle2));
if (x>=0 && x<=1000)
pattern=(double)LR.antenna_pattern[(int)rint(azimuth)][x];
patterndB=20.0*log10(pattern);
}
if (metric)
fprintf(fd2,"Distance to %s: %.2f kilometers\n",destination.name,KM_PER_MILE*Distance(source,destination));
else
fprintf(fd2,"Distance to %s: %.2f miles\n",destination.name,Distance(source,destination));
fprintf(fd2,"Azimuth to %s: %.2f degrees\n",destination.name,azimuth);
if (angle1>=0.0)
fprintf(fd2,"Elevation angle to %s: %+.4f degrees\n",destination.name,angle1);
else
fprintf(fd2,"Depression angle to %s: %+.4f degrees\n",destination.name,angle1);
if ((angle2-angle1)>0.0001)
{
if (angle2<0.0)
fprintf(fd2,"Depression");
else
fprintf(fd2,"Elevation");
//fprintf(fd2," angle to the first obstruction: %+.4f degrees\n",angle2);
}
//fprintf(fd2,"\n%s\n\n",dashes);
/* Receiver */
fprintf(fd2,"Receiver site: %s\n",destination.name);
if (destination.lat>=0.0)
{
fprintf(fd2,"Site location: %.4f North / %.4f West",destination.lat, destination.lon);
//fprintf(fd2, " (%s N / ", destination.lat);
}
else
{
fprintf(fd2,"Site location: %.4f South / %.4f West",-destination.lat, destination.lon);
//fprintf(fd2, " (%s S / ", destination.lat);
}
//fprintf(fd2, "%s W)\n", destination.lon);
if (metric)
{
fprintf(fd2,"Ground elevation: %.2f meters AMSL\n",METERS_PER_FOOT*GetElevation(destination));
fprintf(fd2,"Antenna height: %.2f meters AGL / %.2f meters AMSL\n",METERS_PER_FOOT*destination.alt, METERS_PER_FOOT*(destination.alt+GetElevation(destination)));
}
else
{
fprintf(fd2,"Ground elevation: %.2f feet AMSL\n",GetElevation(destination));
fprintf(fd2,"Antenna height: %.2f feet AGL / %.2f feet AMSL\n",destination.alt, destination.alt+GetElevation(destination));
}
/*haavt=haat(destination);
if (haavt>-4999.0)
{
if (metric)
fprintf(fd2,"Antenna height above average terrain: %.2f meters\n",METERS_PER_FOOT*haavt);
else
fprintf(fd2,"Antenna height above average terrain: %.2f feet\n",haavt);
}*/
if (metric)
fprintf(fd2,"Distance to %s: %.2f kilometers\n",source.name,KM_PER_MILE*Distance(source,destination));
else
fprintf(fd2,"Distance to %s: %.2f miles\n",source.name,Distance(source,destination));
azimuth=Azimuth(destination,source);
angle1=ElevationAngle(destination,source);
angle2=ElevationAngle2(destination,source,earthradius);
fprintf(fd2,"Azimuth to %s: %.2f degrees\n",source.name,azimuth);
if (angle1>=0.0)
fprintf(fd2,"Elevation angle to %s: %+.4f degrees\n",source.name,angle1);
else
fprintf(fd2,"Depression angle to %s: %+.4f degrees\n",source.name,angle1);
if ((angle2-angle1)>0.0001)
{
if (angle2<0.0)
fprintf(fd2,"Depression");
else
fprintf(fd2,"Elevation");
//fprintf(fd2," angle to the first obstruction: %+.4f degrees\n",angle2);
}
//fprintf(fd2,"\n%s\n\n",dashes);
if (LR.frq_mhz>0.0)
{
fprintf(fd2,"Longley-Rice path calculation parameters used in this analysis:\n\n");
fprintf(fd2,"Earth's Dielectric Constant: %.3lf\n",LR.eps_dielect);
fprintf(fd2,"Earth's Conductivity: %.3lf Siemens/meter\n",LR.sgm_conductivity);
fprintf(fd2,"Atmospheric Bending Constant (N-units): %.3lf ppm\n",LR.eno_ns_surfref);
fprintf(fd2,"Frequency: %.3lf MHz\n",LR.frq_mhz);
fprintf(fd2,"Radio Climate: %d (",LR.radio_climate);
switch (LR.radio_climate)
{
case 1:
fprintf(fd2,"Equatorial");
break;
case 2:
fprintf(fd2,"Continental Subtropical");
break;
case 3:
fprintf(fd2,"Maritime Subtropical");
break;
case 4:
fprintf(fd2,"Desert");
break;
case 5:
fprintf(fd2,"Continental Temperate");
break;
case 6:
fprintf(fd2,"Martitime Temperate, Over Land");
break;
case 7:
fprintf(fd2,"Maritime Temperate, Over Sea");
break;
default:
fprintf(fd2,"Unknown");
}
fprintf(fd2,")\nPolarisation: %d (",LR.pol);
if (LR.pol==0)
fprintf(fd2,"Horizontal");
if (LR.pol==1)
fprintf(fd2,"Vertical");
fprintf(fd2,")\nFraction of Situations: %.1lf%c\n",LR.conf*100.0,37);
fprintf(fd2,"Fraction of Time: %.1lf%c\n",LR.rel*100.0,37);
if (LR.erp!=0.0)
{
fprintf(fd2,"Transmitter ERP: ");
if (LR.erp<1.0)
fprintf(fd2,"%.1lf milliwatts",1000.0*LR.erp);
if (LR.erp>=1.0 && LR.erp<10.0)
fprintf(fd2,"%.1lf Watts",LR.erp);
if (LR.erp>=10.0 && LR.erp<10.0e3)
fprintf(fd2,"%.0lf Watts",LR.erp);
if (LR.erp>=10.0e3)
fprintf(fd2,"%.3lf kilowatts",LR.erp/1.0e3);
dBm=10.0*(log10(LR.erp*1000.0));
fprintf(fd2," (%+.2f dBm)\n",dBm);
/* EIRP = ERP + 2.14 dB */
fprintf(fd2,"Transmitter EIRP: ");
eirp=LR.erp*1.636816521;
if (eirp<1.0)
fprintf(fd2,"%.1lf milliwatts",1000.0*eirp);
if (eirp>=1.0 && eirp<10.0)
fprintf(fd2,"%.1lf Watts",eirp);
if (eirp>=10.0 && eirp<10.0e3)
fprintf(fd2,"%.0lf Watts",eirp);
if (eirp>=10.0e3)
fprintf(fd2,"%.3lf kilowatts",eirp/1.0e3);
dBm=10.0*(log10(eirp*1000.0));
fprintf(fd2," (%+.2f dBm)\n",dBm);
}
fprintf(fd2,"\n%s\n\n",dashes);
fprintf(fd2,"Summary for the link between %s and %s:\n\n",source.name, destination.name);
if (patterndB!=0.0)
fprintf(fd2,"%s antenna pattern towards %s: %.3f (%.2f dB)\n", source.name, destination.name, pattern, patterndB);
ReadPath(source, destination); /* source=TX, destination=RX */
/* Copy elevations plus clutter along
path into the elev[] array. */
for (x=1; x<path.length-1; x++)
elev[x+2]=METERS_PER_FOOT*(path.elevation[x]==0.0?path.elevation[x]:(clutter+path.elevation[x]));
/* Copy ending points without clutter */
elev[2]=path.elevation[0]*METERS_PER_FOOT;
elev[path.length+1]=path.elevation[path.length-1]*METERS_PER_FOOT;
fd=fopen("profile.gp","w");
azimuth=rint(Azimuth(source,destination));
for (y=2; y<(path.length-1); y++) /* path.length-1 avoids LR error */
{
distance=5280.0*path.distance[y];
source_alt=four_thirds_earth+source.alt+path.elevation[0];
dest_alt=four_thirds_earth+destination.alt+path.elevation[y];
dest_alt2=dest_alt*dest_alt;
source_alt2=source_alt*source_alt;
/* Calculate the cosine of the elevation of
the receiver as seen by the transmitter. */
cos_xmtr_angle=((source_alt2)+(distance*distance)-(dest_alt2))/(2.0*source_alt*distance);
if (got_elevation_pattern)
{
/* If an antenna elevation pattern is available, the
following code determines the elevation angle to
the first obstruction along the path. */
for (x=2, block=0; x<y && block==0; x++)
{
distance=5280.0*(path.distance[y]-path.distance[x]);
test_alt=four_thirds_earth+path.elevation[x];
/* Calculate the cosine of the elevation
angle of the terrain (test point)
as seen by the transmitter. */
cos_test_angle=((source_alt2)+(distance*distance)-(test_alt*test_alt))/(2.0*source_alt*distance);
/* Compare these two angles to determine if
an obstruction exists. Since we're comparing
the cosines of these angles rather than
the angles themselves, the sense of the
following "if" statement is reversed from
what it would be if the angles themselves
were compared. */
if (cos_xmtr_angle>=cos_test_angle)
block=1;
}
/* At this point, we have the elevation angle
to the first obstruction (if it exists). */
}
/* Determine path loss for each point along the
path using Longley-Rice's point_to_point mode
starting at x=2 (number_of_points = 1), the
shortest distance terrain can play a role in
path loss. */
elev[0]=y-1; /* (number of points - 1) */
/* Distance between elevation samples */
elev[1]=METERS_PER_MILE*(path.distance[y]-path.distance[y-1]);
point_to_point(elev, source.alt*METERS_PER_FOOT,
destination.alt*METERS_PER_FOOT, LR.eps_dielect,
LR.sgm_conductivity, LR.eno_ns_surfref, LR.frq_mhz,
LR.radio_climate, LR.pol, LR.conf, LR.rel, loss,
strmode, errnum);
if (block)
elevation=((acos(cos_test_angle))/DEG2RAD)-90.0;
else
elevation=((acos(cos_xmtr_angle))/DEG2RAD)-90.0;
/* Integrate the antenna's radiation
pattern into the overall path loss. */
x=(int)rint(10.0*(10.0-elevation));
if (x>=0 && x<=1000)
{
pattern=(double)LR.antenna_pattern[(int)azimuth][x];
if (pattern!=0.0)
patterndB=20.0*log10(pattern);
}
else
patterndB=0.0;
total_loss=loss-patterndB;
if (metric)
fprintf(fd,"%f\t%f\n",KM_PER_MILE*(path.distance[path.length-1]-path.distance[y]),total_loss);
else
fprintf(fd,"%f\t%f\n",path.distance[path.length-1]-path.distance[y],total_loss);
if (total_loss>maxloss)
maxloss=total_loss;
if (total_loss<minloss)
minloss=total_loss;
}
fclose(fd);
distance=Distance(source,destination);
if (distance!=0.0)
{
free_space_loss=36.6+(20.0*log10(LR.frq_mhz))+(20.0*log10(distance));
fprintf(fd2,"Free space path loss: %.2f dB\n",free_space_loss);
}
fprintf(fd2,"Longley-Rice path loss: %.2f dB\n",loss);
if (free_space_loss!=0.0)
fprintf(fd2,"Attenuation due to terrain shielding: %.2f dB\n",loss-free_space_loss);
if (patterndB!=0.0)
fprintf(fd2,"Total path loss including %s antenna pattern: %.2f dB\n",source.name,total_loss);
if (LR.erp!=0.0)
{
field_strength=(139.4+(20.0*log10(LR.frq_mhz))-total_loss)+(10.0*log10(LR.erp/1000.0));
/* dBm is referenced to EIRP */
rxp=eirp/(pow(10.0,(total_loss/10.0)));
dBm=10.0*(log10(rxp*1000.0));
power_density=(eirp/(pow(10.0,(total_loss-free_space_loss)/10.0)));
/* divide by 4*PI*distance_in_meters squared */
power_density/=(4.0*PI*distance*distance*2589988.11);
fprintf(fd2,"Field strength at %s: %.2f dBuV/meter\n", destination.name,field_strength);
fprintf(fd2,"Signal power level at %s: %+.2f dBm\n",destination.name,dBm);
fprintf(fd2,"Signal power density at %s: %+.2f dBW per square meter\n",destination.name,10.0*log10(power_density));
voltage=1.0e6*sqrt(50.0*(eirp/(pow(10.0,(total_loss-2.14)/10.0))));
fprintf(fd2,"Voltage across 50 ohm dipole at %s: %.2f uV (%.2f dBuV)\n",destination.name,voltage,20.0*log10(voltage));
voltage=1.0e6*sqrt(75.0*(eirp/(pow(10.0,(total_loss-2.14)/10.0))));
fprintf(fd2,"Voltage across 75 ohm dipole at %s: %.2f uV (%.2f dBuV)\n",destination.name,voltage,20.0*log10(voltage));
}
fprintf(fd2,"Mode of propagation: %s\n",strmode);
fprintf(fd2,"Longley-Rice model error number: %d",errnum);
switch (errnum)
{
case 0:
fprintf(fd2," (No error)\n");
break;
case 1:
fprintf(fd2,"\n Warning: Some parameters are nearly out of range.\n");
fprintf(fd2," Results should be used with caution.\n");
break;
case 2:
fprintf(fd2,"\n Note: Default parameters have been substituted for impossible ones.\n");
break;
case 3:
fprintf(fd2,"\n Warning: A combination of parameters is out of range.\n");
fprintf(fd2," Results are probably invalid.\n");
break;
default:
fprintf(fd2,"\n Warning: Some parameters are out of range.\n");
fprintf(fd2," Results are probably invalid.\n");
}
fprintf(fd2,"\n%s\n\n",dashes);
}
ObstructionAnalysis(source, destination, LR.frq_mhz, fd2);
fclose(fd2);
/* Skip plotting the graph if ONLY a path-loss report is needed. */
if (graph_it)
{
if (name[0]=='.')
{
/* Default filename and output file type */
strncpy(basename,"profile\0",8);
strncpy(term,"png\0",4);
strncpy(ext,"png\0",4);
}
else
{
/* Extract extension and terminal type from "name" */
ext[0]=0;
y=strlen(name);
strncpy(basename,name,254);
for (x=y-1; x>0 && name[x]!='.'; x--);
if (x>0) /* Extension found */
{
for (z=x+1; z<=y && (z-(x+1))<10; z++)
{
ext[z-(x+1)]=tolower(name[z]);
term[z-(x+1)]=name[z];
}
ext[z-(x+1)]=0; /* Ensure an ending 0 */
term[z-(x+1)]=0;
basename[x]=0;
}
}
if (ext[0]==0) /* No extension -- Default is png */
{
strncpy(term,"png\0",4);
strncpy(ext,"png\0",4);
}
/* Either .ps or .postscript may be used
as an extension for postscript output. */
if (strncmp(term,"postscript",10)==0)
strncpy(ext,"ps\0",3);
else if (strncmp(ext,"ps",2)==0)
strncpy(term,"postscript enhanced color\0",26);
fd=fopen("ppa.gp","w");
fprintf(fd,"set grid\n");
fprintf(fd,"set yrange [%2.3f to %2.3f]\n", minloss, maxloss);
fprintf(fd,"set encoding iso_8859_1\n");
fprintf(fd,"set term %s\n",term);
fprintf(fd,"set title \"%s Loss Profile Along Path Between %s and %s (%.2f%c azimuth)\"\n",ppa_name, destination.name, source.name, Azimuth(destination,source),176);
if (metric)
fprintf(fd,"set xlabel \"Distance Between %s and %s (%.2f kilometers)\"\n",destination.name,source.name,KM_PER_MILE*Distance(destination,source));
else
fprintf(fd,"set xlabel \"Distance Between %s and %s (%.2f miles)\"\n",destination.name,source.name,Distance(destination,source));
if (got_azimuth_pattern || got_elevation_pattern)
fprintf(fd,"set ylabel \"Total Path Loss (including TX antenna pattern) (dB)");
else
fprintf(fd,"set ylabel \"Longley-Rice Path Loss (dB)");
fprintf(fd,"\"\nset output \"%s.%s\"\n",basename,ext);
fprintf(fd,"plot \"profile.gp\" title \"Path Loss\" with lines\n");
fclose(fd);
x=system("gnuplot ppa.gp");
if (x!=-1)
{
if (gpsav==0)
{
//unlink("ppa.gp");
//unlink("profile.gp");
//unlink("reference.gp");
}
}
else
fprintf(stderr,"\n*** ERROR: Error occurred invoking gnuplot!\n");
}
}
void SiteReport(struct site xmtr)
{
char report_name[80];
double terrain;
int x, azi;
FILE *fd;
sprintf(report_name,"%s-site_report.txt",xmtr.name);
for (x=0; report_name[x]!=0; x++)
if (report_name[x]==32 || report_name[x]==17 || report_name[x]==92 || report_name[x]==42 || report_name[x]==47)
report_name[x]='_';
fd=fopen(report_name,"w");
fprintf(fd,"\n\t--==[ %s v%s Site Analysis Report For: %s ]==--\n\n",ppa_name, ppa_version, xmtr.name);
fprintf(fd,"%s\n\n",dashes);
if (xmtr.lat>=0.0)
{
fprintf(fd,"Site location: %.4f North / %.4f West",xmtr.lat, xmtr.lon);
fprintf(fd, " (%s N / ",xmtr.lat);
}
else
{
fprintf(fd,"Site location: %.4f South / %.4f West",-xmtr.lat, xmtr.lon);
fprintf(fd, " (%s S / ",xmtr.lat);
}
fprintf(fd, "%s W)\n",xmtr.lon);
if (metric)
{
fprintf(fd,"Ground elevation: %.2f meters AMSL\n",METERS_PER_FOOT*GetElevation(xmtr));
fprintf(fd,"Antenna height: %.2f meters AGL / %.2f meters AMSL\n",METERS_PER_FOOT*xmtr.alt, METERS_PER_FOOT*(xmtr.alt+GetElevation(xmtr)));
}
else
{
fprintf(fd,"Ground elevation: %.2f feet AMSL\n",GetElevation(xmtr));
fprintf(fd,"Antenna height: %.2f feet AGL / %.2f feet AMSL\n",xmtr.alt, xmtr.alt+GetElevation(xmtr));
}
terrain=haat(xmtr);
if (terrain>-4999.0)
{
if (metric)
fprintf(fd,"Antenna height above average terrain: %.2f meters\n\n",METERS_PER_FOOT*terrain);
else
fprintf(fd,"Antenna height above average terrain: %.2f feet\n\n",terrain);
/* Display the average terrain between 2 and 10 miles
from the transmitter site at azimuths of 0, 45, 90,
135, 180, 225, 270, and 315 degrees. */
for (azi=0; azi<=315; azi+=45)
{
fprintf(fd,"Average terrain at %3d degrees azimuth: ",azi);
terrain=AverageTerrain(xmtr,(double)azi,2.0,10.0);
if (terrain>-4999.0)
{
if (metric)
fprintf(fd,"%.2f meters AMSL\n",METERS_PER_FOOT*terrain);
else
fprintf(fd,"%.2f feet AMSL\n",terrain);
}
else
fprintf(fd,"No terrain\n");
}
}
fprintf(fd,"\n%s\n\n",dashes);
fclose(fd);
}
void LoadTopoData(int max_lon, int min_lon, int max_lat, int min_lat, int winfiles)
{
/* This function loads the SDF files required
to cover the limits of the region specified. */
int x, y, width, ymin, ymax;
width=ReduceAngle(max_lon-min_lon);
if ((max_lon-min_lon)<=180.0)
{
for (y=0; y<=width; y++)
for (x=min_lat; x<=max_lat; x++)
{
ymin=(int)(min_lon+(double)y);
while (ymin<0)
ymin+=360;
while (ymin>=360)
ymin-=360;
ymax=ymin+1;
while (ymax<0)
ymax+=360;
while (ymax>=360)
ymax-=360;
if (winfiles==1){
if (ippd==3600)
snprintf(string,19,"%d=%d=%d=%d=hd",x, x+1, ymin, ymax);
else
snprintf(string,16,"%d=%d=%d=%d",x, x+1, ymin, ymax);
}else{
if (ippd==3600)
snprintf(string,19,"%d:%d:%d:%d=hd",x, x+1, ymin, ymax);
else
snprintf(string,16,"%d:%d:%d:%d",x, x+1, ymin, ymax);
}
LoadSDF(string,winfiles);
}
}
else
{
for (y=0; y<=width; y++)
for (x=min_lat; x<=max_lat; x++)
{
ymin=max_lon+y;
while (ymin<0)
ymin+=360;
while (ymin>=360)
ymin-=360;
ymax=ymin+1;
while (ymax<0)
ymax+=360;
while (ymax>=360)
ymax-=360;
if (winfiles==1){
if (ippd==3600)
snprintf(string,19,"%d=%d=%d=%d=hd",x, x+1, ymin, ymax);
else
snprintf(string,16,"%d=%d=%d=%d",x, x+1, ymin, ymax);
}else{
if (ippd==3600)
snprintf(string,19,"%d:%d:%d:%d=hd",x, x+1, ymin, ymax);
else
snprintf(string,16,"%d:%d:%d:%d",x, x+1, ymin, ymax);
}
LoadSDF(string,winfiles);
}
}
}
int main(int argc, char *argv[])
{
int x, y, z=0, min_lat, min_lon, max_lat, max_lon,
rxlat, rxlon, txlat, txlon, width=1000, height=350, winfiles=0;
unsigned char height_plot=0, norm=0, pt2pt_mode=1,
max_txsites, nolospath=0, nositereports=0, fresnel_plot=1;
char header[80], height_file[255], return_height_file[255],
longley_file[255], string[255], ext[20];
double er_mult,txla=999, txlo=999, rxla=999, rxlo=999, txh=0, rxh=0;
struct site tx_site[32], rx_site;
strncpy(ppa_version,"1.3.1\0",5);
strncpy(ppa_name,"PPA\0",4);
strncpy(dashes,"---------------------------------------------------------------------------\0",76);
if (argc==1)
{
fprintf(stdout,"\n\t\t --==[ %s v%s Available Options... ]==--\n\n",ppa_name, ppa_version);
fprintf(stdout," -m Metric units (Default = Imperial)\n");
fprintf(stdout," -tla Tx latitude)\n");
fprintf(stdout," -tlo Tx longitude (W) Positive value 0 to 360)\n");
fprintf(stdout," -th Tx Height)\n");
fprintf(stdout," -rla Rx latitude)\n");
fprintf(stdout," -rlo Rx longitude (W) Positive value 0 to 360)\n");
fprintf(stdout," -rh Rx Height)\n");
fprintf(stdout," -fz Fresnel zone clearance percentage (default = 60)\n");
fprintf(stdout," -f frequency for Fresnel zone calculation (MHz)\n");
fprintf(stdout," -w Effective radiated power in Watts. Default=0\n");
fprintf(stdout," -p Polarisation. Default=1 (Vertical). 0=Horizontal\n");
fprintf(stdout," -d sdf file directory path (overrides path in ~/.ppa_path file)\n");
fprintf(stdout," -x PNG graph width (default = 800)\n");
fprintf(stdout," -y PNG graph height (default = 200)\n");
fprintf(stdout," -n Normalise graph\n");
fprintf(stdout," -v Output value. 1=Path loss dB, 2=Rxd power dBm (default),3=Field strength dBuV/m\n");
fprintf(stdout," -o PNG filename. Return PNG will be called $filename_R.png\n");
fprintf(stdout," -wf Windows SDF tiles with equals not colons\n");
}
y=argc-1;
metric=0;
sdf_path[0]=0;
path.length=0;
max_txsites=2;
fzone_clearance=0.6;
contour_threshold=0;
rx_site.lat=91.0;
rx_site.lon=361.0;
longley_file[0]=0;
earthradius=EARTHRADIUS;
LR.eps_dielect=15.0;
LR.sgm_conductivity=0.005;
LR.eno_ns_surfref=301.0;
LR.frq_mhz=300.0; //
LR.radio_climate=5;
LR.pol=1; //
LR.conf=0.50;
LR.rel=0.50;
LR.erp=0.0; //
ippd=IPPD; /* pixels per degree (integer) */
ppd=(double)ippd; /* pixels per degree (double) */
dpp=1.0/ppd; /* degrees per pixel */
mpi=ippd-1; /* maximum pixel index per degree */
for (x=0; x<4; x++)
{
tx_site[x].lat=91.0;
tx_site[x].lon=361.0;
}
for (x=0; x<MAXPAGES; x++)
{
dem[x].min_el=32768;
dem[x].max_el=-32768;
dem[x].min_north=90;
dem[x].max_north=-90;
dem[x].min_west=360;
dem[x].max_west=-1;
}
/* Scan for command line arguments */
for (x=1; x<=y; x++)
{
if (strcmp(argv[x],"-m")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
{
sscanf(argv[z],"%lf",&er_mult);
if (er_mult<0.1)
er_mult=1.0;
if (er_mult>1.0e6)
er_mult=1.0e6;
earthradius*=er_mult;
}
}
if (strcmp(argv[x],"-fz")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
{
sscanf(argv[z],"%lf",&fzone_clearance);
if (fzone_clearance<0.0 || fzone_clearance>100.0)
fzone_clearance=60.0;
fzone_clearance/=100.0;
}
}
if (strcmp(argv[x],"-x")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
{
sscanf(argv[z],"%d",&width);
}
}
if (strcmp(argv[x],"-y")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
{
sscanf(argv[z],"%d",&height);
}
}
if (strcmp(argv[x],"-o")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
{
strncpy(height_file,argv[z],253);
height_plot=1;
pt2pt_mode=1;
}
}
if (strcmp(argv[x],"-m")==0)
metric=1;
if (strcmp(argv[x],"-n")==0)
norm=1;
if (strcmp(argv[x],"-d")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
strncpy(sdf_path,argv[z],253);
}
if (strcmp(argv[x],"-tla")==0)
{
/* Read Transmitter Lat */
z=x+1;
if (z<=y && argv[z][0])
{
//strncpy(txla,argv[z],253);
sscanf(argv[z],"%lf",&txla);
}
}
if (strcmp(argv[x],"-tlo")==0)
{
/* Read Transmitter Lon */
z=x+1;
if (z<=y && argv[z][0])
{
//strncpy(txla,argv[z],253);
sscanf(argv[z],"%lf",&txlo);
}
}
if (strcmp(argv[x],"-rla")==0)
{
/* Read Rx Lat */
z=x+1;
if (z<=y && argv[z][0])
{
//strncpy(txla,argv[z],253);
sscanf(argv[z],"%lf",&rxla);
}
}
if (strcmp(argv[x],"-rlo")==0)
{
/* Read Rx lon */
z=x+1;
if (z<=y && argv[z][0])
{
//strncpy(txla,argv[z],253);
sscanf(argv[z],"%lf",&rxlo);
}
}
if (strcmp(argv[x],"-th")==0)
{
/* Read Transmitter height */
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
{
//strncpy(txla,argv[z],253);
sscanf(argv[z],"%lf",&txh);
}
}
if (strcmp(argv[x],"-rh")==0)
{
/* Read Rx height */
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
{
sscanf(argv[z],"%lf",&rxh);
}
}
if (strcmp(argv[x],"-f")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
{
sscanf(argv[z],"%lf",&LR.frq_mhz);
if (LR.frq_mhz<20.0)
LR.frq_mhz=0.0;
if (LR.frq_mhz>100.0e3)
LR.frq_mhz=100.0e3;
}
}
if (strcmp(argv[x],"-p")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]!='-')
{
sscanf(argv[z],"%d",&LR.pol);
}
}
if (strcmp(argv[x],"-w")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]>0)
{
sscanf(argv[z],"%lf",&LR.erp);
}
}
if (strcmp(argv[x],"-v")==0)
{
z=x+1;
if (z<=y && argv[z][0] && argv[z][0]>0)
{
sscanf(argv[z],"%d",&output);
}
}
//Windows friendly SDF filenames
if (strcmp(argv[x],"-wf")==0)
{
z=x+1;
winfiles=1;
}
}
if(txla==999 || txlo==999 || rxla==999 || rxlo==999){
fprintf(stdout,"\nERROR: BAD LOCATION GIVEN\n");
exit(1);
}
if (metric)
{
txh/=METERS_PER_FOOT; /* meters --> feet */
rxh/=METERS_PER_FOOT; /* kilometers --> miles */
}
// populate sites
tx_site[0].lat = txla;
tx_site[0].lon = txlo;
tx_site[0].alt = txh;
strncpy(tx_site[0].name,"A",2);
rx_site.lat = rxla;
rx_site.lon = rxlo;
rx_site.alt = rxh;
strncpy(rx_site.name,"B",2);
// 100 mile limit
if(Distance(tx_site[0],rx_site) > 100){
fprintf(stdout,"\nToo far!\n");
fflush(stdout);
exit(1);
}
if (sdf_path[0])
{
x=strlen(sdf_path);
if (sdf_path[x-1]!='/' && x!=0)
{
sdf_path[x]='/';
sdf_path[x+1]=0;
}
}
fprintf(stdout,"%s",header);
fflush(stdout);
x=0;
y=0;
min_lat=90;
max_lat=-90;
min_lon=(int)floor(tx_site[0].lon);
max_lon=(int)floor(tx_site[0].lon);
txlat=(int)floor(tx_site[0].lat);
txlon=(int)floor(tx_site[0].lon);
if (txlat<min_lat)
min_lat=txlat;
if (txlat>max_lat)
max_lat=txlat;
if (LonDiff(txlon,min_lon)<0.0)
min_lon=txlon;
if (LonDiff(txlon,max_lon)>=0.0)
max_lon=txlon;
rxlat=(int)floor(rx_site.lat);
rxlon=(int)floor(rx_site.lon);
if (rxlat<min_lat)
min_lat=rxlat;
if (rxlat>max_lat)
max_lat=rxlat;
if (LonDiff(rxlon,min_lon)<0.0)
min_lon=rxlon;
if (LonDiff(rxlon,max_lon)>=0.0)
max_lon=rxlon;
/* Load the required SDF files */
LoadTopoData(max_lon, min_lon, max_lat, min_lat, winfiles);
//PlaceMarker(rx_site);
if (height_plot)
{
/* Extract extension (if present)
from "height_file" */
y=strlen(height_file);
for (x=y-1; x>0 && height_file[x]!='.'; x--);
if (x>0) /* Extension found */
{
for (z=x+1; z<=y && (z-(x+1))<10; z++)
ext[z-(x+1)]=tolower(height_file[z]);
ext[z-(x+1)]=0; /* Ensure an ending 0 */
height_file[x]=0; /* Chop off extension */
}
else
strncpy(ext,"png\0",4);
}
//Plot it
PlotPath(tx_site[0],rx_site,1);
PathReport(tx_site[0],rx_site,height_file,0);
//add .png extension to filename
snprintf(string,250,"%s.%s%c",height_file,ext,0);
GraphHeight(tx_site[0],rx_site,string,fresnel_plot,norm,width,height);
double outvalue=dBm;
char* outunit="dBm";
if(output==1){
outvalue=loss;
outunit="dB";
}
if(output==3){
outvalue=field_strength;
outunit="dBuV/m";
}
fprintf(stdout,"%.2f %s\n",outvalue,outunit);
fflush(stdout);
//RETURN PATH
//Plot it
PlotPath(rx_site,tx_site[0],1);
snprintf(return_height_file,250,"%s_R%c",height_file,0);
PathReport(rx_site,tx_site[0],return_height_file,0);
//add .png extension to filename_R
snprintf(string,250,"%s_R.%s%c",height_file,ext,0);
GraphHeight(rx_site,tx_site[0],string,fresnel_plot,norm,width,height);
outvalue=dBm;
outunit="dBm";
if(output==1){
outvalue=loss;
outunit="dB";
}
if(output==3){
outvalue=field_strength;
outunit="dBuV/m";
}
fprintf(stdout,"%.2f %s\n",outvalue,outunit);
fflush(stdout);
return 0;
}
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