HFNOC/Signal-Server
2
0
Fork 0
forked from ExternalVendorCode/Signal-Server
Code Pull Requests Activity

2.5 - Major refactor

Browse Source
This commit is contained in:
alex
2015-05-27 21:45:05 +01:00
parent d2233ddb43
commit 2364bbf6b9
51 changed files with 17014 additions and 19187 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
models/README Normal file
View File

@@ -0,0 +1,7 @@
Whilst every effort has been made to ensure the accuracy of the models, their
accuracy is not guaranteed.
Finding a reputable paper to source these models from took a while. There was
lots of bad copy-paste out there. A good paper:
http://www.cl.cam.ac.uk/research/dtg/lce-pub/public/vsa23/VTC05_Empirical.pdf

60
models/cost.cc Normal file
View File

@@ -0,0 +1,60 @@
/*****************************************************************************
* COST231-HATA MODEL for Signal Server by Alex Farrant *
* 30 December 2013i *
* 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. *
* */
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
double COST231pathLoss(float f, float TxH, float RxH, float d, int mode)
{
/*
COST231 extension to HATA model
Frequency 1500 to 2000MHz
TxH = Base station height 30 to 200m
RxH = Mobile station height 1 to 10m
Distance 1-20km
modes 1 = URBAN, 2 = SUBURBAN, 3 = OPEN
http://morse.colorado.edu/~tlen5510/text/classwebch3.html
*/
if (f < 150 || f > 2000) {
printf
("Error: COST231 Hata model frequency range 150-2000MHz\n");
exit(EXIT_FAILURE);
}
int C = 3; // 3dB for Urban
float lRxH = log10(11.75 * RxH);
float C_H = 3.2 * (lRxH * lRxH) - 4.97; // Large city (conservative)
int c0 = 69.55;
int cf = 26.16;
if (f > 1500) {
c0 = 46.3;
cf = 33.9;
}
if (mode == 2) {
C = 0; // Medium city (average)
C_H = 8.29 * (lRxH * lRxH) - 1.1;
}
if (mode == 3) {
C = -3; // Small city (Optimistic)
C_H = (1.1 * log10(f) - 0.7) * RxH - (1.56 * log10(f)) + 0.8;
}
float logf = log10(f);
double dbloss =
c0 + (cf * logf) - (13.82 * log10(TxH)) - C_H + (44.9 -
6.55 *
log10(TxH)) *
log10(d) + C;
return dbloss;
}

6
models/cost.hh Normal file
View File

@@ -0,0 +1,6 @@
#ifndef _COST_HH_
#define _COST_HH_
double COST231pathLoss(float f, float TxH, float RxH, float d, int mode);
#endif /* _COST_HH_ */

26
models/ecc33.cc Normal file
View File

@@ -0,0 +1,26 @@
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
double ECC33pathLoss(float f, float TxH, float RxH, float d, int mode)
{
if (f < 700 || f > 3500) {
printf("Error: ECC33 model frequency range 700-3500MHz\n");
exit(EXIT_FAILURE);
}
// MHz to GHz
f = f / 1000;
double Gr = 0.759 * RxH - 1.862; // Big city with tall buildings (1)
// PL = Afs + Abm - Gb - Gr
double Afs = 92.4 + 20 * log10(d) + 20 * log10(f);
double Abm =
20.41 + 9.83 * log10(d) + 7.894 * log10(f) +
9.56 * (log10(f) * log10(f));
double Gb = log10(TxH / 200) * (13.958 + 5.8 * (log10(d) * log10(d)));
if (mode > 1) { // Medium city (Europe)
Gr = (42.57 + 13.7 * log10(f)) * (log10(RxH) - 0.585);
}
return Afs + Abm - Gb - Gr;
}

6
models/ecc33.hh Normal file
View File

@@ -0,0 +1,6 @@
#ifndef _ECC33_HH_
#define _ECC33_HH_
double ECC33pathLoss(float f, float TxH, float RxH, float d, int mode);
#endif /* _ECC33_HH_ */

33
models/ericsson.cc Normal file
View File

@@ -0,0 +1,33 @@
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
double EricssonpathLoss(float f, float TxH, float RxH, float d, int mode)
{
/*
http://research.ijcaonline.org/volume84/number7/pxc3892830.pdf
AKA Ericsson 9999 model
*/
// Default is Urban which bizarrely has lowest loss
double a0 = 36.2, a1 = 30.2, a2 = -12, a3 = 0.1;
if (f < 150 || f > 3500) {
printf
("Error: Ericsson9999 model frequency range 150-3500MHz\n");
exit(EXIT_FAILURE);
}
if (mode == 2) { // Suburban / Med loss
a0 = 43.2;
a1 = 68.93;
}
if (mode == 1) { // "Rural" but has highest loss according to Ericsson.
a0 = 45.95;
a1 = 100.6;
}
double g1 = (11.75 * RxH) * (11.75 * RxH);
double g2 = (44.49 * log10(f)) - 4.78 * ((log10(f) * log10(f)));
return a0 + a1 * log10(d) + a2 * log10(TxH) +
a3 * log10(TxH) * log10(d) - (3.2 * log10(g1)) + g2;
}

6
models/ericsson.hh Normal file
View File

@@ -0,0 +1,6 @@
#ifndef _ERICSSON_HH_
#define _ERICSSON_HH_
double EricssonpathLoss(float f, float TxH, float RxH, float d, int mode);
#endif /* _ERICSSON_HH_ */

30
models/fspl.cc Normal file
View File

@@ -0,0 +1,30 @@
/*****************************************************************************
* ITU-R P.525 Free Space Path Loss model for Signal Server by Alex Farrant *
* 15 January 2014 *
* 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. *
* */
#include <math.h>
double FSPLpathLoss(float f, float d)
{
/*
Free Space Path Loss model
Frequency: Any
Distance: Any
*/
//MHz to GHz
f = f / 1000;
double dbloss = (20 * log10(d)) + (20 * log10(f)) + 92.45;
return dbloss;
}

6
models/fspl.hh Normal file
View File

@@ -0,0 +1,6 @@
#ifndef _FSPL_HH_
#define _FSPL_HH_
double FSPLpathLoss(float f, float d);
#endif /* _FSPL_HH_ */

56
models/hata.cc Normal file
View File

@@ -0,0 +1,56 @@
/*****************************************************************************
* HATA MODEL for Signal Server by Alex Farrant *
* 30 December 2013 *
* 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. *
* */
#include <math.h>
double HATApathLoss(float f, float h_B, float h_M, float d, int mode)
{
/*
HATA URBAN model for cellular planning
Frequency (MHz) 150 to 1500MHz
Base station height 30-200m
Mobile station height 1-10m
Distance 1-20km
mode 1 = URBAN
mode 2 = SUBURBAN
mode 3 = OPEN
*/
float lh_M = log10(11.75 * h_M);
float C_H = 3.2 * lh_M * lh_M - 4.97;
float logf = log10(f);
float L_u =
69.55 + 26.16 * logf - 13.82 * log10(h_B) - C_H + (44.9 -
6.55 *
log10(h_B)) *
log10(d);
if (!mode || mode == 1) {
return L_u; //URBAN
}
if (mode == 2) { //SUBURBAN
float logf_28 = log10(f / 28);
return L_u - 2 * logf_28 * logf_28 - 5.4;
}
if (mode == 3) { //OPEN
return L_u - 4.78 * logf * logf + 18.33 * logf - 40.94;
}
return 0;
}

6
models/hata.hh Normal file
View File

@@ -0,0 +1,6 @@
#ifndef _HATA_HH_
#define _HATA_HH_
double HATApathLoss(float f, float h_B, float h_M, float d, int mode);
#endif /* _HATA_HH_ */

1574
models/itm.cc Normal file
View File

File diff suppressed because it is too large Load Diff

2963
models/itwom3.0.cc Normal file
View File

File diff suppressed because it is too large Load Diff

14
models/itwom3.0.hh Normal file
View File

@@ -0,0 +1,14 @@
#ifndef _ITWOM30_HH_
#define _ITWOM30_HH_
void point_to_point_ITM(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);
void point_to_point(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);
#endif /* _ITWOM30_HH_ */

864
models/los.cc Normal file
View File

@@ -0,0 +1,864 @@
#include <stdio.h>
#include <math.h>
#include "../common.h"
#include "../main.hh"
#include "cost.hh"
#include "ecc33.hh"
#include "ericsson.hh"
#include "fspl.hh"
#include "hata.hh"
#include "itwom3.0.hh"
#include "sui.hh"
/*
* Acute Angle from Rx point to an obstacle of height (opp) and
* distance (adj)
*/
static double incidenceAngle(double opp, double adj)
{
return atan2(opp, adj) * 180 / PI;
}
/*
* Knife edge diffraction:
* This is based upon a recognised formula like Huygens, but trades
* thoroughness for increased speed which adds a proportional diffraction
* effect to obstacles.
*/
static double ked(double freq, double rxh, double dkm)
{
double obh, obd, rxobaoi = 0, d, dipheight = 25;
obh = 0; // Obstacle height
obd = 0; // Obstacle distance
dkm = dkm * 1000; // KM to metres
// walk along path
for (int n = 2; n < (dkm / elev[1]); n++) {
d = (n - 2) * elev[1]; // no of points * delta = km
//Find dip(s)
if (elev[n] < (obh + dipheight)) {
// Angle from Rx point to obstacle
rxobaoi =
incidenceAngle((obh - (elev[n] + rxh)), d - obd);
} else {
// Line of sight or higher
rxobaoi = 0;
}
//note the highest point
if (elev[n] > obh) {
obh = elev[n];
obd = d;
}
}
if (rxobaoi >= 0) {
return rxobaoi / (300 / freq); // Diffraction angle divided by wavelength (m)
} else {
return 0;
}
}
void PlotLOSPath(struct site source, struct site destination, char mask_value,
FILE *fd)
{
/* 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 ss. */
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 PlotPropPath(struct site source, struct site destination,
unsigned char mask_value, FILE * fd, int propmodel,
int knifeedge, int pmenv)
{
int x, y, ifs, ofs, errnum;
char block = 0, strmode[100];
double loss, azimuth, pattern = 0.0,
xmtr_alt, dest_alt, xmtr_alt2, dest_alt2,
cos_rcvr_angle, cos_test_angle = 0.0, test_alt,
elevation = 0.0, distance = 0.0, four_thirds_earth,
field_strength = 0.0, rxp, dBm, txelev, dkm, diffloss;
struct site temp;
ReadPath(source, destination);
four_thirds_earth = FOUR_THIRDS * EARTHRADIUS;
for (x = 1; x < path.length - 1; x++)
elev[x + 2] =
(path.elevation[x] ==
0.0 ? path.elevation[x] * METERS_PER_FOOT : (clutter +
path.
elevation[x])
* METERS_PER_FOOT);
/* Copy ending points without clutter */
elev[2] = path.elevation[0] * METERS_PER_FOOT;
txelev = elev[2] + (source.alt * METERS_PER_FOOT);
elev[path.length + 1] =
path.elevation[path.length - 1] * METERS_PER_FOOT;
/* Since the only energy the Longley-Rice model considers
reaching the destination is based on what is scattered
or deflected from the first obstruction along the path,
we first need to find the location and elevation angle
of that first obstruction (if it exists). This is done
using a 4/3rds Earth radius to match the model used by
Longley-Rice. This information is required for properly
integrating the antenna's elevation pattern into the
calculation for overall path loss. */
for (y = 2; (y < (path.length - 1) && path.distance[y] <= max_range);
y++) {
/* Process this point only if it
has not already been processed. */
if ((GetMask(path.lat[y], path.lon[y]) & 248) !=
(mask_value << 3)) {
distance = 5280.0 * path.distance[y];
xmtr_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;
xmtr_alt2 = xmtr_alt * xmtr_alt;
/* Calculate the cosine of the elevation of
the receiver as seen by the transmitter. */
cos_rcvr_angle =
((xmtr_alt2) + (distance * distance) -
(dest_alt2)) / (2.0 * xmtr_alt * distance);
if (cos_rcvr_angle > 1.0)
cos_rcvr_angle = 1.0;
if (cos_rcvr_angle < -1.0)
cos_rcvr_angle = -1.0;
if (got_elevation_pattern || fd != NULL) {
/* Determine the elevation angle to the first obstruction
along the path IF elevation pattern data is available
or an output (.ano) file has been designated. */
for (x = 2, block = 0; (x < y && block == 0);
x++) {
distance = 5280.0 * path.distance[x];
test_alt =
four_thirds_earth +
(path.elevation[x] ==
0.0 ? path.elevation[x] : path.
elevation[x] + clutter);
/* Calculate the cosine of the elevation
angle of the terrain (test point)
as seen by the transmitter. */
cos_test_angle =
((xmtr_alt2) +
(distance * distance) -
(test_alt * test_alt)) / (2.0 *
xmtr_alt
*
distance);
if (cos_test_angle > 1.0)
cos_test_angle = 1.0;
if (cos_test_angle < -1.0)
cos_test_angle = -1.0;
/* 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_rcvr_angle >= cos_test_angle)
block = 1;
}
if (block)
elevation =
((acos(cos_test_angle)) / DEG2RAD) -
90.0;
else
elevation =
((acos(cos_rcvr_angle)) / DEG2RAD) -
90.0;
}
/* Determine attenuation for each point along the
path using a prop model starting at y=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]);
if (path.elevation[y] < 1) {
path.elevation[y] = 1;
}
dkm = (elev[1] * elev[0]) / 1000; // km
switch (propmodel) {
case 1:
// Longley Rice ITM
point_to_point_ITM(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);
break;
case 3:
//HATA 1, 2 & 3
loss =
HATApathLoss(LR.frq_mhz, txelev,
path.elevation[y] +
(destination.alt *
METERS_PER_FOOT), dkm, pmenv);
break;
case 4:
// COST231-HATA
loss =
ECC33pathLoss(LR.frq_mhz, txelev,
path.elevation[y] +
(destination.alt *
METERS_PER_FOOT), dkm,
pmenv);
break;
case 5:
// SUI
loss =
SUIpathLoss(LR.frq_mhz, txelev,
path.elevation[y] +
(destination.alt *
METERS_PER_FOOT), dkm, pmenv);
break;
case 6:
loss =
COST231pathLoss(LR.frq_mhz, txelev,
path.elevation[y] +
(destination.alt *
METERS_PER_FOOT), dkm,
pmenv);
break;
case 7:
// ITU-R P.525 Free space path loss
loss = FSPLpathLoss(LR.frq_mhz, dkm);
break;
case 8:
// ITWOM 3.0
point_to_point(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);
break;
case 9:
// Ericsson
loss =
EricssonpathLoss(LR.frq_mhz, txelev,
path.elevation[y] +
(destination.alt *
METERS_PER_FOOT), dkm,
pmenv);
break;
default:
point_to_point_ITM(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 (knifeedge == 1) {
diffloss =
ked(LR.frq_mhz,
destination.alt * METERS_PER_FOOT, dkm);
loss += (diffloss); // ;)
}
//Key stage. Link dB for p2p is returned as 'loss'.
temp.lat = path.lat[y];
temp.lon = path.lon[y];
azimuth = (Azimuth(source, temp));
if (fd != NULL)
fprintf(fd, "%.7f, %.7f, %.3f, %.3f, ",
path.lat[y], path.lon[y], azimuth,
elevation);
/* If ERP==0, write path loss to alphanumeric
output file. Otherwise, write field strength
or received power level (below), as appropriate. */
if (fd != NULL && LR.erp == 0.0)
fprintf(fd, "%.2f", loss);
/* Integrate the antenna's radiation
pattern into the overall path loss. */
x = (int)rint(10.0 * (10.0 - elevation));
if (x >= 0 && x <= 1000) {
azimuth = rint(azimuth);
pattern =
(double)LR.antenna_pattern[(int)azimuth][x];
if (pattern != 0.0) {
pattern = 20.0 * log10(pattern);
loss -= pattern;
}
}
if (LR.erp != 0.0) {
if (dbm) {
/* dBm is based on EIRP (ERP + 2.14) */
rxp =
LR.erp /
(pow(10.0, (loss - 2.14) / 10.0));
dBm = 10.0 * (log10(rxp * 1000.0));
if (fd != NULL)
fprintf(fd, "%.3f", dBm);
/* Scale roughly between 0 and 255 */
ifs = 200 + (int)rint(dBm);
if (ifs < 0)
ifs = 0;
if (ifs > 255)
ifs = 255;
ofs =
GetSignal(path.lat[y], path.lon[y]);
if (ofs > ifs)
ifs = ofs;
PutSignal(path.lat[y], path.lon[y],
(unsigned char)ifs);
}
else {
field_strength =
(139.4 +
(20.0 * log10(LR.frq_mhz)) -
loss) +
(10.0 * log10(LR.erp / 1000.0));
ifs = 100 + (int)rint(field_strength);
if (ifs < 0)
ifs = 0;
if (ifs > 255)
ifs = 255;
ofs =
GetSignal(path.lat[y], path.lon[y]);
if (ofs > ifs)
ifs = ofs;
PutSignal(path.lat[y], path.lon[y],
(unsigned char)ifs);
if (fd != NULL)
fprintf(fd, "%.3f",
field_strength);
}
}
else {
if (loss > 255)
ifs = 255;
else
ifs = (int)rint(loss);
ofs = GetSignal(path.lat[y], path.lon[y]);
if (ofs < ifs && ofs != 0)
ifs = ofs;
PutSignal(path.lat[y], path.lon[y],
(unsigned char)ifs);
}
if (fd != NULL) {
if (block)
fprintf(fd, " *");
fprintf(fd, "\n");
}
/* Mark this point as having been analyzed */
PutMask(path.lat[y], path.lon[y],
(GetMask(path.lat[y], path.lon[y]) & 7) +
(mask_value << 3));
}
}
}
void PlotLOSMap(struct site source, double altitude, char *plo_filename)
{
/* This function performs a 360 degree sweep around the
transmitter site (source location), and plots the
line-of-sight coverage of the transmitter on the ss
generated topographic map based on a receiver located
at the specified altitude (in feet AGL). Results
are stored in memory, and written out in the form
of a topographic map when the WritePPM() function
is later invoked. */
int x, y, z;
struct site edge;
double lat, lon, minwest, maxnorth, th;
static unsigned char mask_value = 1;
FILE *fd = NULL;
if (plo_filename[0] != 0)
fd = fopen(plo_filename, "wb");
if (fd != NULL) {
fprintf(fd,
"%d, %d\t; max_west, min_west\n%d, %d\t; max_north, min_north\n",
max_west, min_west, max_north, min_north);
}
th = ppd / loops;
z = (int)(th * ReduceAngle(max_west - min_west));
minwest = dpp + (double)min_west;
maxnorth = (double)max_north - dpp;
for (lon = minwest, x = 0, y = 0;
(LonDiff(lon, (double)max_west) <= 0.0);
y++, lon = minwest + (dpp * (double)y)) {
if (lon >= 360.0)
lon -= 360.0;
edge.lat = max_north;
edge.lon = lon;
edge.alt = altitude;
PlotLOSPath(source, edge, mask_value, fd);
}
z = (int)(th * (double)(max_north - min_north));
for (lat = maxnorth, x = 0, y = 0; lat >= (double)min_north;
y++, lat = maxnorth - (dpp * (double)y)) {
edge.lat = lat;
edge.lon = min_west;
edge.alt = altitude;
PlotLOSPath(source, edge, mask_value, fd);
}
z = (int)(th * ReduceAngle(max_west - min_west));
for (lon = minwest, x = 0, y = 0;
(LonDiff(lon, (double)max_west) <= 0.0);
y++, lon = minwest + (dpp * (double)y)) {
if (lon >= 360.0)
lon -= 360.0;
edge.lat = min_north;
edge.lon = lon;
edge.alt = altitude;
PlotLOSPath(source, edge, mask_value, fd);
}
z = (int)(th * (double)(max_north - min_north));
for (lat = (double)min_north, x = 0, y = 0; lat < (double)max_north;
y++, lat = (double)min_north + (dpp * (double)y)) {
edge.lat = lat;
edge.lon = max_west;
edge.alt = altitude;
PlotLOSPath(source, edge, mask_value, fd);
}
switch (mask_value) {
case 1:
mask_value = 8;
break;
case 8:
mask_value = 16;
break;
case 16:
mask_value = 32;
}
}
void PlotPropagation(struct site source, double altitude, char *plo_filename,
int propmodel, int knifeedge, int haf, int pmenv)
{
int y, z, count;
struct site edge;
double lat, lon, minwest, maxnorth, th;
unsigned char x;
static unsigned char mask_value = 1;
FILE *fd = NULL;
minwest = dpp + (double)min_west;
maxnorth = (double)max_north - dpp;
count = 0;
if (LR.erp == 0.0 && debug)
fprintf(stdout, "path loss");
else {
if (debug) {
if (dbm)
fprintf(stdout, "signal power level");
else
fprintf(stdout, "field strength");
}
}
if (debug) {
fprintf(stdout,
" contours of \"%s\"\nout to a radius of %.2f %s with Rx antenna(s) at %.2f %s AGL\n",
source.name,
metric ? max_range * KM_PER_MILE : max_range,
metric ? "kilometers" : "miles",
metric ? altitude * METERS_PER_FOOT : altitude,
metric ? "meters" : "feet");
}
if (clutter > 0.0 && debug)
fprintf(stdout, "\nand %.2f %s of ground clutter",
metric ? clutter * METERS_PER_FOOT : clutter,
metric ? "meters" : "feet");
if (debug) {
fprintf(stdout, "...\n\n 0%c to 25%c ", 37, 37);
fflush(stdout);
}
if (plo_filename[0] != 0)
fd = fopen(plo_filename, "wb");
if (fd != NULL) {
fprintf(fd,
"%d, %d\t; max_west, min_west\n%d, %d\t; max_north, min_north\n",
max_west, min_west, max_north, min_north);
}
th = ppd / loops;
// Four sections start here
//S1
if (haf == 0 || haf == 1) {
z = (int)(th * ReduceAngle(max_west - min_west));
for (lon = minwest, x = 0, y = 0;
(LonDiff(lon, (double)max_west) <= 0.0);
y++, lon = minwest + (dpp * (double)y)) {
if (lon >= 360.0)
lon -= 360.0;
edge.lat = max_north;
edge.lon = lon;
edge.alt = altitude;
PlotPropPath(source, edge, mask_value, fd, propmodel,
knifeedge, pmenv);
count++;
if (count == z) {
count = 0;
if (x == 3)
x = 0;
else
x++;
}
}
}
//S2
if (haf == 0 || haf == 1) {
count = 0;
if (debug) {
fprintf(stdout, "\n25%c to 50%c ", 37, 37);
fflush(stdout);
}
z = (int)(th * (double)(max_north - min_north));
for (lat = maxnorth, x = 0, y = 0; lat >= (double)min_north;
y++, lat = maxnorth - (dpp * (double)y)) {
edge.lat = lat;
edge.lon = min_west;
edge.alt = altitude;
PlotPropPath(source, edge, mask_value, fd, propmodel,
knifeedge, pmenv);
count++;
if (count == z) {
count = 0;
if (x == 3)
x = 0;
else
x++;
}
}
}
//S3
if (haf == 0 || haf == 2) {
count = 0;
if (debug) {
fprintf(stdout, "\n50%c to 75%c ", 37, 37);
fflush(stdout);
}
z = (int)(th * ReduceAngle(max_west - min_west));
for (lon = minwest, x = 0, y = 0;
(LonDiff(lon, (double)max_west) <= 0.0);
y++, lon = minwest + (dpp * (double)y)) {
if (lon >= 360.0)
lon -= 360.0;
edge.lat = min_north;
edge.lon = lon;
edge.alt = altitude;
PlotPropPath(source, edge, mask_value, fd, propmodel,
knifeedge, pmenv);
count++;
if (count == z) {
count = 0;
if (x == 3)
x = 0;
else
x++;
}
}
}
//S4
if (haf == 0 || haf == 2) {
count = 0;
if (debug) {
fprintf(stdout, "\n75%c to 100%c ", 37, 37);
fflush(stdout);
}
z = (int)(th * (double)(max_north - min_north));
for (lat = (double)min_north, x = 0, y = 0;
lat < (double)max_north;
y++, lat = (double)min_north + (dpp * (double)y)) {
edge.lat = lat;
edge.lon = max_west;
edge.alt = altitude;
PlotPropPath(source, edge, mask_value, fd, propmodel,
knifeedge, pmenv);
count++;
if (count == z) {
count = 0;
if (x == 3)
x = 0;
else
x++;
}
}
} //S4
if (fd != NULL)
fclose(fd);
if (mask_value < 30)
mask_value++;
}
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);
}
}
}

18
models/los.hh Normal file
View File

@@ -0,0 +1,18 @@
#ifndef _LOS_HH_
#define _LOS_HH_
#include <stdio.h>
#include "../common.h"
void PlotLOSPath(struct site source, struct site destination, char mask_value,
FILE *fd);
void PlotPropPath(struct site source, struct site destination,
unsigned char mask_value, FILE * fd, int propmodel,
int knifeedge, int pmenv);
void PlotLOSMap(struct site source, double altitude, char *plo_filename);
void PlotPropagation(struct site source, double altitude, char *plo_filename,
int propmodel, int knifeedge, int haf, int pmenv);
void PlotPath(struct site source, struct site destination, char mask_value);
#endif /* _LOS_HH_ */

49
models/sui.cc Normal file
View File

@@ -0,0 +1,49 @@
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
double SUIpathLoss(float f, float TxH, float RxH, float d, int mode)
{
/*
f = Frequency (MHz)
TxH = Transmitter height (m)
RxH = Receiver height (m)
d = distance (km)
mode 1 = Hilly + trees
mode 2 = Flat + trees OR hilly + light foliage
mode 3 = Flat + light foliage
http://www.cl.cam.ac.uk/research/dtg/lce-pub/public/vsa23/VTC05_Empirical.pdf
*/
d = d * 1000; // km to m
if (f < 1900 || f > 11000) {
printf("Error: SUI model frequency range 1.9-11GHz\n");
exit(EXIT_FAILURE);
}
// Terrain mode A is default
double a = 4.6;
double b = 0.0075;
double c = 12.6;
double s = 10.6; // Optional fading value
int XhCF = -10.8;
if (mode == 2) {
a = 4.0;
b = 0.0065;
c = 17.1;
s = 6; // average
}
if (mode == 3) {
a = 3.6;
b = 0.005;
c = 20;
s = 3; // Optimistic
XhCF = -20;
}
double d0 = 100;
double A = 20 * log10((4 * M_PI * d0) / (300 / f));
double y = (a - b * TxH) + c / TxH;
double Xf = 6 * log10(f / 2000);
double Xh = XhCF * log10(RxH / 2);
return A + (10 * y * log10(d / d0)) + Xf + Xh + s;
}

6
models/sui.hh Normal file
View File

@@ -0,0 +1,6 @@
#ifndef _SUI_HH_
#define _SUI_HH_
double SUIpathLoss(float f, float TxH, float RxH, float d, int mode);
#endif /* _SUI_HH_ */