Ground Wave Prediction System (GWPS 4)
The Ground Wave Prediction System 4 (GWPS 4) is a graphical user interface driven tool for predicting the propagation of radio waves in the MF and HF frequency bands over the surface of the Earth. The program can be used to generate area prediction charts of ground-wave field strength, signal-to-noise ratio (SNR), and frequency range (single and multi-surface) for the user selectable transmitter location and area of interest. Many other two-dimensional plots can be generated.
GWPS 4 is an application designed to run under Microsoft Windows XP or Windows 7 installed on modern personal computers. The program will run under 32- or 64-bit versions of Windows 7. A minimum of 50 Mega Bytes of hard disk space is required to install and run the program.
Latest Version: GWPS Version 4 - released April, 2011
The Ground Wave Prediction System 4 is a GUI-driven tool for predicting the propagation of radio waves in the MF and HF frequency bands over the surface of the Earth.
GWPS 4.0 New Features
- Area prediction charts of ground-wave field strength (dB above 1 mV/m), signal-to-noise ratio (SNR), and frequency range (single and multi-surface) for the user selectable transmitter (Tx) location and area of interest.
- Area prediction results are generated using full multi-surface calculations and a new high spatial resolution (0.02° or 2 km at the equator) table of surface conductivity and dielectric permittivity.
- Up to 500 x 500 grid cells within the user selectable area of interest so that multi-surface area predictions can exploit the full resolution of the new high-resolution land-sea-ice table.
- Implementation of a faster multi-surface algorithm to reduce the calculation time required for large numbers of grid cells.
- New high spatial resolution land mass outlines including islands, reefs, and lakes.
- Export of area prediction results in KMZ file format for importing as an information layer within Google Earth®.
- Area prediction charts of background noise (CCIR or ITU atmospheric noise + made noise + galactic noise).
- Latest ITU-R recommended method for calculating the total noise by combining atmospheric, galactic and man-made noise levels.
- Improved area prediction input dialogue including more user selectable regional geographic maps.
- Moving the cursor throughout the area prediction displays the geodetic coordinates, range, bearing, and parameter value.
- The option to overlay range markers (circles) at preset intervals from the Tx.
- The option to contour and/or smooth the area prediction results.
- All the familiar features of GWPS 3 remain in GWPS 4.
- Revised HTML User Guide.
- Graphical interface for specifying parameters (ground conditions/local noise conditions/transmitting and receiving antenna specifications).
- World map for location selection or easy location lookup.
- Numerical range estimate.
- Electric field strength versus range plots.
- Range versus frequency plots.
- Range versus power plots.
- Range versus time of day plots.
- Frequency versus time of day plots.
- Automatic access to up to date ionospheric data downloaded from the Web.
- Full documentation and user guide.
Listed below are known problems and solutions of ASAPS and GWPS.
|Date: 13 February 2012|
|Comment: ASAPS V6.1 Patch for ASAPS V6.0
1. Several customers have reported difficulty saving prediction files when running ASAPS under Windows 7. We suggest they change the ASAPS user directory path to the application data path under their user account directory.
For example, under Databases --> Configuration --> User Directory, change "C:\PROGRAM FILES\IPS\ASAPS6" to "C:\Users\yourusername\AppData\"
2. ASAPS dialogues are now centred under the ASAPS application window, rather than the centre of the screen. This will help users running multiple applications on large, high resolution monitors.
3. The input of frequency for surface-wave calculations is now restricted to the range 15 kHz to 50000 kHz.
4. The input of "Required % Days" is now restricted to the practical range 10 to 90%.
5. Improved algorithm for interpolating atmospheric noise model across time blocks.
6. Improved manual entry and saving of 3D antenna gain patterns.
7. The magnetic field model has been updated to IGRF 2011.
8. Improved atmospheric noise model.
9. Other improvements and bug fixes to increase the useability and stability of the program.
|Date: 20 December 2011|
|Comment: GWPS 4.1 Patch free for GWPS 4.0 customers
Updated: 13 February 2012
1. The ability to export and import input prediction dialogue parameters.
2. The ability to save and retrieve user-defined areas of interest within the input prediction dialogue.
3. The input parameters prediction dialogue now "remembers" the last world map chosen by the user.
4. Terminal geodetic coordinates are now stored with greater numerical precision permitting location of stations to the nearest 100 m.
5. The exported KML/KMZ files now use relative directory paths facilitating greater flexibility in the sharing of prediction results across platforms.
6. User selection of azimuth used to select different range profiles of atmospheric noise when calculating 2D graphs of range versus power and frequency.
7. User selection of fixed minimum and maximum colour scale values for field strength and SNR area predictions.
8. Range circle lines now drawn using selectable units of nmi, mi, and km.
9. Other minor improvements and bug fixes to increase the usability and stability of the program.
10. HTML documentation now also included as a single PDF file.
|Date: 4 April 2010|
|Comment: ASAPS V5.4 Patch for ASAPS V5.3
1. Compatibility with 64-bit Windows 7 operating system. Backwards compatibility with 32-bit Windows operating systems.
2. VBX grid component used in the T-index and Antenna dialogues in versions up to ASAPS 5.3 has been replaced by a custom spread sheet.
3. The ASAPS 5 User Guide has been converted from Windows Help format (.hlp) to HTML Help format (.chm) so that it can be viewed with Windows Vista and Windows 7.
|Date: 4 June 2008|
|Comment: ASAPS V5.3 Patch for all previous versions of ASAPS V5 to ASAPS V5.2
Contains all previous V5 patches and upgrades below.
1. Updated Tutorial for version 5.3
2. Multi-surface: Implementing the Rec 368-5 Annex II Millington ?Application to mixed Paths? method. Calculating Field Strength over multiple surface types as described in CCIR recommendation 368-5
3. "Surface Wave" and "Multi-Surface" displays modified to use the Prediction Confidence parameter in the Station Configuration menu.
4. Modify computation of All Modes Score for SNR Frequency Set Test and Frequency Selection to use the logarithmic average of the maximum SNR value from all modes that satisfy the required criteria for each frequency.
5. User Guide: ITU vs CCIR noise method explanation to clarify use of Atmospheric, Man-Made and Galactic noise components calculations if they are selected for Atmospheric noise in Station Config menu.
6. User Guide:"Database restrictions" updated regarding Tx power, Rx bandwidth and frequency limits in a Frequency Set for the skywave and surface wave.
7. Antenna Database: CODAN Antenna gain patterns added.
8. Antenna Database: bugfixes for (a) deleting 2D frequency & elevation angle records (b) 3D antenna database problem (c) caching
9. Frequencies above 32.77MHz allowed: BUF and Surface Wave displays in ASAPS could previously only display frequencies up to 32,766 KHz in the specified Frequency Set for Skywave and Surface Wave.
10. Area Predictions: Units stated corrected to dBuV/m (dB above a microVolt per metre). Changed the units title above the colour scale from "dBW/Hz" to "dBuV/m" and also changed the title in the Area Prediction table from "Noise @ BUF" to "Noise field strength @ BUF"
11. Area Prediction: Mouse position now displays range, bearing and units as well as latitude, longitude and data
12. Area Prediction: Correction to SNR Area Prediction and Area Table to show dB values below zero.
13. Area Prediction: "Ionospheric modes" display changed to interpolate better between modes (eg. 1E to (100 by 100 grid points) grids and higher frequencies (40 MHz).
14. Area Prediction: Bugfix that now allows for high density (100 by 100 grid points) grids and higher frequencies (40 MHz).
15. Corrected minor problem with the labelling of the 1st E-mode and 2nd E- and F-modes for hop lengths in the range 2025-2050km. Now the EMUF mode extends to hop lengths up to 2050 km, as stated in the Original Model document, and is not rounded off to 2025 km as in previous versions of ASAPS5.
|Date: 31 March 2006|
|Comment: ASAPS V5.2 Patch for all previous versions of ASAPS V5|
1. Modification to SNR Frequency Set Selection algorithm when calculating the top frequency.
2. A choice between ITU and CCIR Atmospheric Noise maps.
3. Multi-Surface groundwave SNR contour plots available for specific frequencies as part of Area predictions.
4. Area predictions now have a maximum of 100 x 100 coordinates in the grid, as opposed to 50 x 50 for earlier versions.
5. 2D antennas - bug fix for problem importing antennas with non-integer frequencies.
6. EZNEC antenna files:
7. FST 16 months / T index selection - bug fix to allow this option to be 'de-selected' from the FST dialog box.
|Date: 27 April 2005|
|Comment: ASAPS V5.1 Patch for all previous versions of ASAPS V5|
1. GRAFEX Frequency Set Test to include 'all modes' score and the availabilities of the main and all modes.
2. "SNR confidence level" renamed to "Prediction Confidence" (or PC) level, with a link to this provided in the Station Configuration.
3. Titles for the method to be used to calculate PCL (polarization coupling loss), i.e., "Old algorithm" and "New algorithm", replaced by "Approximation" and "Full calculation".
4. SNR Frequency Set Test - E mode inclusion for 3000-4000km
5. GRAFEX - View|Select Frequency Set Cancel button erases current frequency set selection in all Views using it.
6.SNR Frequency Selection:
7. Improve the algorithm to select the Best Frequency Set.
8. EMUF factor-distance table improved.
9. Include the 'All Modes' score in the GRAFEX and SNR Frequency Set Selection and Test Concise formats.
10. Latest magnetic field model IGRF10 included, valid for predictions to 2015. This updates Field Strength through pathloss and polarisation coupling loss calculations.
|Date: 30 April 2004|
|Comment: ASAPS V5 Patch for versions of ASAPS V5 prior to 30 April 2004.|
1. Points 1., 2. and 3 as listed below in the Patch dated 31 October 2003.
2. Points 2., 3. and 4 as listed below in the Patch dated 12 March 2004.
3. A problem was found with the ASAPS5 Surface Wave prediction when the Atmospheric Noise switch is toggled "on" and "off". The noise module "frno_new1.cpp" that was plugged into the GWPS3 Kernel did not have a flag to switch off the Atmospheric Noise. Hence there was still a diurnal variation in the Surface Wave SNR calculation, even if the Atmospheric Noise was switched "off" and the Man Made Noise was lower than the CCIR Atmospheric Noise (e.g Remote or -164 dBW/Hz @3MHz).
|Date: 12 March 2004|
|Comment: ASAPS V5 Patch for versions of ASAPS V5 prior to 12 March 2004.|
1. Points 1., 2. and 3 as listed below in the Patch dated 31 October 2003.
2. There was a bug in the ASAPS5 Kernel when calculating the bearings between the Transmitter and Receiver locations, when they are aligned with the North-South meridian. This was inserted to prevent a division by zero error and the programmer used Pi/2 instead of Pi for a bearing of 180 degrees. The bearing in GRAFEX and Field Strength predictions is not only used for display purposes, but is also used for the 3D Antenna Gain calculation. This means that for Circuits aligned with due North (0 degrees) or due South (180 degrees), the 3D Antenna Gain calculation was using a bearing in error by 90 degrees. For example, the bearing between Transmitter and Receiver and vice versa was 0, 270 degrees instead of 0 ,180 degrees and 90, 360 degrees instead of 180 ,360 degrees. This bug has now been fixed in the ASAPS5 Kernel via the FPATH.DLL, FPRED.DLL and FPLOS.DLL files included in the patch below.
3. EZNEC antenna gain patterns can now be imported to the antenna database. When importing EZNEC antennas, the filename is used as the antenna name and the text on the 3rd line is used as the antenna description. This facility is incorporated in the updated TINANT.DLL included in the patch file below.
|Date: 31 October 2003|
|Comment: ASAPS V5 Patch for versions of ASAPS V5 prior to 31 October 2003.|
1. The latest release of ASAPS5 does not crash when attempting to open ASAPS4 prediction files, but displays an error message "Could not open document". ASAPS5 can open ASAPS4 GRAFEX (.PRD) files but not ASAPS4 Field Strength files (.FSH), because there is extra data for the new Polarisation Coupling Loss algorithm and SNR confidence levels. Therefore, you can still open an ASAPS4 GRAFEX file and "Recompute", selecting a Frequency Set to regenerate the Field Strength prediction with ASAPS5.
2. While calculating Antenna Gain patterns or when doing the Surface Wave calculation, ASAPS5 now displays an appropriate message in the Status Bar at the bottom left hand corner of the main application window, indicating the reason for the delay.
3. The TinAnt.DLL containing the T-index Grid and Antenna Dialogue has been changed, removing debug output that produces gcache.out and toagb.out files. ASAPS4 did not generate gcache.out or toagb.out files and they are only used for testing, slowing down ASAPS5 considerably especially when using 3D antennas.
|Date: 13 October 2003|
|Comment: ASAPS V5 Patch for versions of ASAPS V5 prior to 8 October 2003.|
When importing T-indices from a text file in the T-index Dialogue and importing / exporting Antennas with text files in the Antenna Dialogue, the ASAPS V5 application window lost precedence, popping behind other windows on the screen.
Also, when selecting a T-index text file in the T-index Dialogue, the "Cancel" button caused ASAPS V5 to "freeze" and become unresponsive.
Furthermore, clicking the buttons multiple times in the T-index Dialogue and Antenna Dialogue now only carries out the command once, waiting until the user is finished. These problems with the T-index Dialogue and Antenna Dialogue have been fixed in the new tinant.dll dated 8 October 2003.
|Date: 12 February 2002|
|Comment: ASAPS for Windows V4.0 and MS Windows 2000|
ASAPS V4 is a 16-bit program. As such, there may be some instances in which it does not perform as expected when run under MS Windows 2000. For example, users may find that when the cursor is located over the minimise/maximise/close buttons at the top right-hand side of the ASAPS screen, the following error message appears:
WASAPS caused an access violation in wow32.dll
ASAPS V5, a 32-bit program due for release in 2003, has been tested successfully on MS Windows 2000.
|Date: 6 July 1999|
|Comment: ASAPS for Windows V4.0 update of fpath.dll|
For near vertical incidence propagation predictions performed at the end of a month and at begining of the next month the differences in MUF's for an hour were greater than expected.
This file has only been tested with ASAPS v4.0.
fpath.dll = 0f5d809739f12349d0d9fa8bf844be39
|Date: 17 June 1998|
|Comment: ASAPS for Windows V4.0 update of TEXT2TDB.EXE|
When you run TEXT2TDB and it goes SPLAT this patch is for you.
Note: You can get around this problem by using the Update from file button on the T-index DB dialog.
|Comment: ASAPS for Windows V4.0 update of ANTENNA.DLL|
If you get the message ERROR: AntRec: SetAngs when converting/importing an ASAPS 2.x antenna database this patch is for you.
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