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Updated GPS Sim (markdown)

Erwin Ried 2020-05-03 17:22:56 +02:00
parent 05ff1e0b23
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GPS-Sim.md

@ -3,7 +3,7 @@ This app allows you to broadcast GPS baseband signal data streams.
## Generator ## Generator
You can use [gps-sdr-sim](https://github.com/osqzss/gps-sdr-sim) to generate data for this app. You can use [gps-sdr-sim](https://github.com/osqzss/gps-sdr-sim) to generate data for this app.
`gps-sdr-sim -e RINEX_NAVIGATION_FILE -l LAT,LONG,HEIGHT -o BBD_NNNN.C8` `gps-sdr-sim -e RINEX_NAVIGATION_FILE -l LAT,LONG,HEIGHT -o SOMENAME.C8`
That will create `SOMENAME.C8`, but note that you also need to specify its sample rate and frequency in another file, as explained below. That will create `SOMENAME.C8`, but note that you also need to specify its sample rate and frequency in another file, as explained below.
@ -16,15 +16,14 @@ Create `SOMENAME.TXT` with:
sample_rate=2600000 sample_rate=2600000
center_frequency=1575420000 center_frequency=1575420000
``` ```
This file should use the same filename as the .C8 file but with .TXT extension. It contains the sample rate and center frequency for the .C8 file. Copy the files to your PortaPack MicroSD and open the .C8 file in the GPS Sim app.
Copy to your PortaPack MicroSD and open the file from the GPS Sim app.
## Example ## Example
We can create a realistic movement using a NMEA GGA stream generator like https://nmeagen.org/. In this website create several multi point lines with the positions you want. Download the NMEA file clicking "Generate NMEA file". We can create a realistic movement using a NMEA GGA stream generator like https://nmeagen.org/. In this website create several multi point lines with the positions you want. Download the NMEA file clicking "Generate NMEA file".
`gps-sdr-sim.exe -e brdc3540.14n -g OUTPUT.nmea -d DURATION -o MYGPSWALK.C8` `gps-sdr-sim.exe -e brdc3540.14n -g OUTPUT.nmea -d DURATION -o MYGPSWALK.C8`
You also need to create `MYGPSWALK.TXT` as specified above, using the same filename as the .C8 file but with .TXT extension. This file contains the sample rate and center frequency. You also need to create `MYGPSWALK.TXT` as specified above.
## Compatibility ## Compatibility
Depending on several factors, results may vary. A modern device will use several sources and methods to validate the current position, so spoofing positions may not be possible in all situations. To improve your chances to receive simulated GPS data, try: Depending on several factors, results may vary. A modern device will use several sources and methods to validate the current position, so spoofing positions may not be possible in all situations. To improve your chances to receive simulated GPS data, try: