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SIGNAL SERVER CHANGELOG
3.20 Beta - 14 Jul 2019 - N9OZB Mods
1. Added .GZ (Gzip) file processing for .sdf.gz DEM tiles.
2. Added .BZ2 (Bzip2) file processing for .sdf.bz2 DEM tiles.
3. Added much improved Antenna file options, new command line options for:
a. AZ/EL file/path with a unique filename, no longer locked to output filename.
b. Can specify command line pattern rotation azimuth, overrides value in file.
c. Can specify command line pattern downtilt and direction, overrides file.
4. Added command line option for color palette file, not locked to output name,
filename/path is used for .scf, .lcf and .dcf files, depending on mode.
5. Fixed major bug in .udt file processing in West (negative) longitudes.
6. Fixed ITM "Conf" and "Rel" options (ITM "situations" and "times") on cmdline.
7. Increased HD Version capacity from 9 to 32 DEM tiles (.sdf files).
8. Updated command line help msg, CHANGELOG, and README.md documentation.
9. Removed extra unused variables, cleaned up code and fixed a few logic issues.
10. Restructured src tree, updated Makefile. Much cleaner directory structure.
11. Added Antenna & UDT test file "ant-udt_test" to ./test.sh suite.
12. Added sample color palette files in ./color.
13. Added some conversion & postdownload scripts to ./utils/sdf.
14. Added sample antenna file DB413-B in ./antenna.
15. Tried to keep cmdline color/antenna and all changes backward compatible.
16. Added base run (runsig.sh) and kmz conversion script (genkmz.sh) files.
17. Added dandy User Manual for reference.
3.11 - 25 Sept 2018
More LIDAR edge cases, tidying of many meridian hacks(!) and regression tested with different LIDAR resolutions and configurations eg. 1x2, 2x1..
Meridian issue fixed for 30m but deliberately broken for 2m due to previous crap hacks causing a headache. Can be fixed in DEM by re-processing LIDAR tiles to NOT span the meridian.
3.10 - 15 Apr 2018
360 min_west fix
3.09 - 7 Feb 2018
Meridian LIDAR cropping fix
3.08 - 17 Dec 2017
Proper fix for nearfield void
More LIDAR edge cases: 1x2, 2x1...
Removed exit() if no colour file
Polyfilla for gaps at tile edges
SUI model clutter factor
3.07 - 2 Sep 2017
Bugfixes for LIDAR edge cases with mismatched tiles, missing tiles etc.
3.06 - 23 June 2017
Cropping edge cases with > 100km and LOS
3.05 - 18 June 2017
LIDAR overhaul for mismatched tiles and different resolutions. No longer expects x/y grid of tiles of equal size.
Dynamic resampling so user can specify *any* resolution less than maximum resolution of data.
3.04 - 19 April 2017
Added Egli VHF/UHF model courtesy of G6DTX
Adjusted SUI correction factor for height. Most academic papers have /2000 but some are /2. Only out by 1e3 :O
New propagation model unit test script at models/test.cc
Added 10 to ARRAYSIZE again as it was needed :p
3.03 - 19 March 2017
Path profile bugfix for some models
Error handling for when prop loss < free space loss
3.02 - 22 Feb 2017
Gareth's error handling
3.01 - 16 Feb 2017
Image crop (Major performance improvement later on), SUI bugfix, txelev replaced
3.0 - 02 Feb 2017
Image rendering library support. Uses third party PNG lib instead of expensive PPM.
Code cleanup by a professional developer.
More errors to stderr
2.94 - 03 Oct 2016
Reduced MAXPAGES array for LIDAR to allow for uber large tiles
2.93 - 30 Sep 2016
More tiles
2.92 - 29 September 2016
Overhauled LIDAR functions to read in (more) native format tiles.
Replaced 'super tile' code with more scalable multi-tile code: currently limited to 16.
2.9 - 01 September 2016
MODIS Landcover support in ASCII Grid format. Works for 1200/3600 SRTM only.
2.82 - 15 July 2016
Fixed bug in SUI model which was making it over optimistic.
2.81 - 01 July 2016
Added Rx gain value for PPA report only and tweaked text report to show ERP/EIRP with and without Rx gain
2.8 - 08 June 2016
Widened scope of LIDAR / ASCII Grid input to include sub-meter accurate tiles. (ac000)
Optimised memory usage (ac000)
Tidied and refactored some code (ac000)
Updated Readme and callsign because I passed my intermediate :)
2.75 - 22 Apr 2016
Added Hata model logic for f < 200MHz
2.72 - 07 Feb 2016
Expanded LIDAR coverage to read in 4 adjacent ASCII tiles in a 2x2 grid
Removed requirement to specify -res in LIDAR mode as it's in the file header
2.71 - 14 Jan 2016
LIDAR longitude bugfix for Greenwich meridian tiles
Adjusted ITM parameters warnings
2.7 - 03 Jan 2016
Added support for LIDAR data in ASCII grid format with WGS84 bounds
Increased resolution to +54000 pixels per degree (2m)
Removed support for Windows SDF filenames without:colons.
2.63 - 10 Nov 2015
Added sanity check and handicap to ECC33 model when used with low Tx heights in hilly areas = sea of red
2.62 - 30 Oct 2015
Fixed near field 'lattice' bug at 30m resolution caused by previous fix to fill in void around antenna.
Credit to Nils Lofstad for helping nail this down.
2.61 - 27 Oct 2015
FSPL model floor reduced from 150MHz to 20MHz.
2.6 - 9 June 2015
Multi-threading support added by Michael Ramnarine
PlotPropagation() and PlotLOSMap() use four threads by default
Feature can be disabled with -nothreads flag
Static and global variables have been made thread safe
2.5 - 27 May 2015
Code refactored by Andrew Clayton / ac000 with header files
New Makefile with c / c++ multi mode compilation
Single executable now with run time switch for HD mode
Models separated into directory
2.44 - 25 Mar 2015
Improved PPA text report to list other prop models
Added HD mode to build script
2.43 - 06 Mar 2015
Improved model error handling
Tweaked params for Ericsson model and inverted environment variables to match rest
v2.41 - 27 February 2015
Simpler PPA output for scripting
Enabled new models for PPA (previously just ITM)
#Define to enable HD mem options/build at build time (-DHD)
Optimised build command (-Ofast) to improve speed by 14%
Improved test script
2.4 - January 2015
Added SUI, ECC33, Ericsson models in new 'models' module
Added model validation
Retired individual model files as some models only 1 or 2 lines of code
2.31 - October 2014
ERP up to 5MW for Mexican TV(!)
2.3 - 29 September 2014
Replaced itm.cpp with itwom3.0.cpp and added ITWOM model as result
2.23 - 14 August 2014
Improved diffraction model to work only for dips deeper than 20m and not to exaggerate result by an arbitrary figure (3)
Fixed false 'frequency too low' error message for FSPL model which was intended for Hata models only.
2.22 -
Fixed LOS not outputting bounds
2.2 -
Made .dot output opt in to save some disk space
Changed version number to line 1 of main.cpp instead of buried in code in two places.
v2.1 -
Added experimental dual core support with -haf
Requires double the RAM
1.3.8 - 16 Jan 2014
Added Free Space Path Loss model (with optional diffraction)
1.3.7 - 30 Dec 2013
Added propagation model option (-pm)
Added HATA urban/suburban/open models (150-1500MHz)
Added COST231-Hata (urban) model (1500-2000MHz)
Added custom Knife Edge Diffraction option (-ked) to enhance new models
Removed unused variables
1.3.6 - 12 Aug 2013
Added LOS model for up to 100GHz
Added 1 arc second (3600 pixels/degree) support (-res 3600)
1.3.5 - 07 Jul 2013
Reduced maxpages to 9
Added memset() to clear DEM before use
1.3.4 - 16 May 2013
High resolution SRTM1 1-arc second DEM support added.
Use -res 3600 and ensure .sdf files are produced with srtm2sdf-hd
1.3.3 - 04 Nov 2012
Air planning:
Increased maximum Tx height to 60,000 (m/f)
Increased maximum Rx height to 60,000 (m/f)
1.3.2 - 04 Oct 2012
Re-instated grey scale option to allow for terrain background.
Off by default. Enable with switch -t
1.3 - 03 Jan 2012
Added user defined clutter layers from SPLAT! (-udt switch)
1.2 - 31 Dec 2011
Max colours increased from 32 to 128
Radius value fixed at metric
Metric / Imperial conversion bug fixed
1.1 - 08 Dec 2011
Max Tx altitude increased to 20,000(m) for high altitude aircraft. "Can you 'ere me now?"
Added 2 new options -tercon, -terdic for *custom* dielectric values and ground conductivity. -te terrain option remains. Use with care!
New Earth Dielectric range (Permittivity): 80 to 0.1
New Conductivity range (Siemens/m): 0.01 to 0.000001
1.0 - 19 November 2011
Signal Server forked from SPLAT!

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# Signal Server
Multi-threaded radio propagation simulator based upon SPLAT! by Alex Farrant QCVS, 2E0TDW.
SPLAT! Project started in 1997 by John A. Magliacane, KD2BD
This server application will generate RF coverage predictions, producing either 2D profile plots (Point-to-Point) or 360 degree polar plots in WGS-84 projection as PPM Bitmaps.
For detailed information and historical reference data related to this project see the SPLAT! documentation. Propagation models added to this project have been sourced from reputable academic sources and all efforts have been taken to ensure their accurate implementation. Not all models are ITU ratified and you use them entirely at your own risk.
WARNING: The accuracy of the output is directly proportional to the accuracy of the inputs and the time taken defining and validating them.
## Requirements
* Linux
* GCC,G++
* Multicore CPU (optional)
* ~2GB Memory
* SRTM terrain tile(s) or ASCII Grid tile(s)
Signal Server is a very resource intensive multicore application. Only publish it for common use if you know what you are doing and you are advised to wrap it with another script to perform input validation.
Additional programs/scripts will be required to prepare inputs such as .hgt tiles (srtm2sdf.c), 3D antenna patterns (.ant) and user defined clutter (.udt) or manipulate the bitmap output (.ppm). More information can be found in the SPLAT! project.
## File extensions and types used by signalserver:
.asc LIDAR topo data file in ASCII grid format.
.jpg LIDAR topo data file in JPEG format.
.sdf SPLAT! topo data file in SPLAT! format, lo-res 90m (from SRTM3).
.sdf.gz topo data file in SPLAT! data format, gzip compressed, lo-res 90m.
.sdf.bz2 topo data file in SPLAT! data format, bzip2 compressed, lo-res 90m.
-hd.sdf SPLAT! topo data file in SPLAT! format, hi-res 30m (from SRTM1).
-hd.sdf.gz topo data file in SPLAT! data format, gzip compressed, hi-res 30m.
-hd.sdf.bz2 topo data file in SPLAT! data format, bzip2 compressed, lo-res 90m.
.scf signal level color palette file.
.lcf loss level color palette file.
.dcf dbm level color palette file.
.az SPLAT! antenna pattern azimuth data file.
.el SPLAT! antenna pattern elevation data file.
.lrp LIDAR antenna pattern data file.
.udt user defined terrain data clutter data text file.
.sh miscellaneous shell scripts and batch files.
.ppm portable pixmap - output plot graphic rendering (native).
.png portable network graphics - output plot graphic rendering (converted).
.kml Google Earth Keyhole Markup Language - output viewable with Google Earth.
.kmz Google Earth Keyhole Markup Language, compressed.
## Installation
```
cd src
make install
```
## Test
```
./test.sh
```
## Parameters
```
Version: Signal Server 3.20 (Built for 100 DEM tiles at 1200 pixels)
License: GNU General Public License (GPL) version 2
Radio propagation simulator by Alex Farrant QCVS, 2E0TDW
Based upon SPLAT! by John Magliacane, KD2BD
Some feature enhancements/additions by Aaron A. Collins, N9OZB
Usage: signalserver [data options] [input options] [antenna options] [output options] -o outputfile
Data:
-sdf Directory containing SRTM derived .sdf DEM tiles (may be .gz or .bz2)
-lid ASCII grid tile (LIDAR) with dimensions and resolution defined in header
-udt User defined point clutter as decimal co-ordinates: 'latitude,longitude,height'
-clt MODIS 17-class wide area clutter in ASCII grid format
-color File to pre-load .scf/.lcf/.dcf for Signal/Loss/dBm color palette
Input:
-lat Tx Latitude (decimal degrees) -70/+70
-lon Tx Longitude (decimal degrees) -180/+180
-rla (Optional) Rx Latitude for PPA (decimal degrees) -70/+70
-rlo (Optional) Rx Longitude for PPA (decimal degrees) -180/+180
-f Tx Frequency (MHz) 20MHz to 100GHz (LOS after 20GHz)
-erp Tx Total Effective Radiated Power in Watts (dBd) inc Tx+Rx gain. 2.14dBi = 0dBd
-gc Random ground clutter (feet/meters)
-m Metric units of measurement
-te Terrain code 1-6 (optional - 1. Water, 2. Marsh, 3. Farmland,
4. Mountain, 5. Desert, 6. Urban
-terdic Terrain dielectric value 2-80 (optional)
-tercon Terrain conductivity 0.01-0.0001 (optional)
-cl Climate code 1-7 (optional - 1. Equatorial 2. Continental subtropical
3. Maritime subtropical 4. Desert 5. Continental temperate
6. Maritime temperate (Land) 7. Maritime temperate (Sea)
-rel Reliability for ITM model (% of 'time') 1 to 99 (optional, default 50%)
-conf Confidence for ITM model (% of 'situations') 1 to 99 (optional, default 50%)
-resample Reduce Lidar resolution by specified factor (2 = 50%)
Output:
-o basename (Output file basename - required)
-dbm Plot Rxd signal power instead of field strength in dBuV/m
-rt Rx Threshold (dB / dBm / dBuV/m)
-R Radius (miles/kilometers)
-res Pixels per tile. 300/600/1200/3600 (Optional. LIDAR res is within the tile)
-pm Propagation model. 1: ITM, 2: LOS, 3: Hata, 4: ECC33,
5: SUI, 6: COST-Hata, 7: FSPL, 8: ITWOM, 9: Ericsson,
10: Plane earth, 11: Egli VHF/UHF, 12: Soil
-pe Propagation model mode: 1=Urban,2=Suburban,3=Rural
-ked Knife edge diffraction (Already on for ITM)
Antenna:
-ant (antenna pattern file basename+path for .az and .el files)
-txh Tx Height (above ground)
-rxh Rx Height(s) (optional. Default=0.1)
-rxg Rx gain dBd (optional for PPA text report)
-hp Horizontal Polarisation (default=vertical)
-rot ( 0.0 - 359.0 degrees, default 0.0) Antenna Pattern Rotation
-dt ( -10.0 - 90.0 degrees, default 0.0) Antenna Downtilt
-dtdir ( 0.0 - 359.0 degrees, default 0.0) Antenna Downtilt Direction
Debugging:
-t Terrain greyscale background
-dbg Verbose debug messages
-ng Normalise Path Profile graph
-haf Halve 1 or 2 (optional)
-nothreads Turn off threaded processing
```
### REFERENCE DATA
Signal server is designed for most of the environments and climates on Planet Earth but Polar region support is limited above extreme latitudes. (Svalbard is ok).
It can run with or without terrain data and can even be used to simulate radiation of other EM emissions like light.
#### -sdf
##### Directory containing Digital Elevation Models (DEM)
SDF formatted tiles can be created by converting SRTM tiles (30m or 90m) in HGT format with the [srtm2sdf.c](https://www.google.co.uk/search?q=srtm2sdf.c) utility from SPLAT!. At the time of writing these tiles can be obtained for free from the [USGS website](https://dds.cr.usgs.gov/srtm/).
Note these can be compressed using gzip or bzip2 if desired to save disk space and speed up loading the files. For hi-res (HD) SRTM1 (30m) data, bzip2 compresses best, and for lo-res SRTM3 (90m) data, gzip seems to achieve the best compression. Either will work fine for whichever data format and resolution is used.
#### -lid
##### WGS84 ASCII grid tile (LIDAR) with dimensions and resolution defined in header
LIDAR data can be used providing it is in ASCII grid format with WGS84 projection. Resolutions up to 25cm have been tested. 2m is recommended for a good trade off. Cellsize should be in degrees and co-ordinates must be in WGS84 decimal degrees.
To load multiple tiles use commas eg. -lid tile1.asc,tile2.asc. You can load in different resolution tiles and use -resample to set the desired resolution (limited by data limit).
```
ncols 2454
nrows 1467
xllcorner -1.475333294357
yllcorner 53.378635095801
cellsize 0.000006170864
NODATA_value 0
0 0 0 0 0 0 0 0 0 0 0 0 0 ...
```
#### -udt
##### User defined CSV clutter file
This text file allows you to define buildings with co-ordinates and heights.
Elevations in the UDT file are evaluated and then copied into a temporary file under /tmp. Then the contents of the temp file are scanned, and if found to be unique, are added to the ground elevations described by the digital elevation data in memory. Height units are determined by appending M for meters or nothing for feet.
There is no special parsing for comments, so any lines of data that don't contain 3 numbers separated by commas are interpreted as a comment.
Format: latitude,longitude,height(M)
```
// This is a comment!
54.555,-2.221,10M
54.555,-2.222,10M
54.555,-2.223,10M
```
### Antenna radiation pattern(s)
Antenna pattern data is read from a pair of files having the same base name as the output file (-o), but with .az and .el extensions for azimuth and elevation patterns. This name can be overridden with the command line option -ant followed by a base filename or path and base filename for the .az and .el files. The program will first search for command line specified antenna files with -ant, then it will default to searching for antenna files having the same name as the output file.
```
045.0
0 0.8950590
1 0.8966406
2 0.8981447
3 0.8995795
4 0.9009535
5 0.9022749
```
The first line of the .az file specifies the direction measured clockwise in degrees from True North. This is followed by azimuth headings (0 to 360 degrees) and their associated normalized field patterns (0.000 to 1.000) separated by whitespace. This direction can be overridden by the command line option -rot followed by a positive direction value from 0 to 360 degrees. This value will override any direction specified in the first line of the .az file. If not specified on the command line, the program will default to using the direction from the first line of the .az file.
The structure of SPLAT! elevation pattern files is slightly different. The first line of the .el file specifies the amount of mechanical beamtilt applied to the antenna. A downward tilt is expressed as a positive angle, while an upward tilt is expressed as a negative angle. This data is followed by the azimuthal direction of the tilt, 0 to 360 degrees, separated by whitespace. These can be overridden by the command line options -dt for downtilt and -dtdir for downtilt azimuthal direction. The options, like -rot above, will override any values embedded in the .el file if specified on the command line.
The remainder of the file consists of elevation angles and their radiation pattern (0.000 to 1.000) values separated by whitespace. Elevation angles must be specified over a -10.0 to +90.0 degree range. In this example, the antenna is tilted down 2 degrees towards an azimuth of 045.0 degrees.
```
2.0 045.0
-10.0 0.172
-9.5 0.109
-9.0 0.115
-8.5 0.155
-8.0 0.157
```
## Examples
### 90m resolution
- INPUTS: 900MHz tower at 25m AGL with 5W ERP, 30km radius
- OUTPUTS: 1200 resolution, 30km radius, -90dBm receiver threshold, Longley Rice model
```
./signalserver -sdf /data/SRTM3 -lat 51.849 -lon -2.2299 -txh 25 -f 900 -erp 5 -rxh 2 -rt -90 -dbm -m -o test1 -R 30 -res 1200 -pm 1
```
### 30m resolution
- INPUTS: 450MHz tower at 25f AGL with 20W ERP, 10km radius
- OUTPUTS: 3600 resolution, 30km radius, 10dBuV receiver threshold, Hata model
```
./signalserverHD -sdf /data/SRTM1 -lat 51.849 -lon -2.2299 -txh 25 -f 450 -erp 20 -rxh 2 -rt 10 -o test2 -R 10 -res 3600 -pm 3
```
### 2m resolution (LIDAR)
- INPUTS: 1800MHz tower at 15m AGL with 1W ERP, 1 km radius
- OUTPUTS: 2m LIDAR resolution, 5km radius, -90dBm receiver threshold, Longley Rice model
```
./signalserverLIDAR -lid /data/LIDAR/Gloucester_2m.asc -lat 51.849 -lon -2.2299 -txh 15 -f 1800 -erp 1 -rxh 2 -rt -90 -dbm -m -o test3 -R 1 -pm 1
```
### Scripting
By using wrapper scripts like runsig.sh and genkmz.sh, you can streamline running signalserver by pre-setting some commonly used options in the runsig.sh file. Those options should the be ones you use every time you run signalserver, like "-m" for metric or "-sdf ./sdf_file_path", for example, so you won't have to specify those options every time you run it. The genkmz.sh file will convert the output ppm file into a .png with transparent background, then will convert it to a Google Earth Keyhole Markup Language (KML) file, and then it compresses it for size to a (KMZ) file. For example, using the provided sample runsig.sh and genkmz.sh:
### Plot 70cm Service contour, 700W ERP, 300 feet AGL, DB413-B, to 150 mi:
sudo ./runsig.sh -lat 42.428889 -lon -87.812500 -txh 300 -f 446.000 -erp 700 -R 150 -res 600 -rel 50 -rt 39 -ant antenna/DB413-B -rot 225 -color color/blue -o example-service | ./genkmz.sh
### Plot 70cm Interference contour, 700W ERP, 300 feet AGL, DB413-B, to 150 mi:
sudo ./runsig.sh -lat 42.428889 -lon -87.812500 -txh 300 -f 446.000 -erp 700 -R 150 -res 600 -rel 10 -rt 21 -ant antenna/DB413-B -rot 225 -color color/blue -o example-service | ./genkmz.sh

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0
0 1.0000
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97 0.2630
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101 0.2399
102 0.2291
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104 0.2188
105 0.2138
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107 0.1995
108 0.1950
109 0.1905
110 0.1862
111 0.1820
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113 0.1698
114 0.1660
115 0.1622
116 0.1585
117 0.1549
118 0.1514
119 0.1479
120 0.1445
121 0.1413
122 0.1380
123 0.1349
124 0.1318
125 0.1288
126 0.1288
127 0.1259
128 0.1230
129 0.1202
130 0.1202
131 0.1175
132 0.1175
133 0.1148
134 0.1148
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136 0.1122
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178 0.1122
179 0.1122
180 0.1122
181 0.1122
182 0.1122
183 0.1122
184 0.1122
185 0.1122
186 0.1122
187 0.1122
188 0.1122
189 0.1122
190 0.1122
191 0.1122
192 0.1096
193 0.1096
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3
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3
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4804083
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