GPS Sim

This app allows you to broadcast GPS baseband signal data streams.

Generator

You can use gps-sdr-sim to generate data for this app.

gps-sdr-sim -e RINEX_NAVIGATION_FILE -l LAT,LONG,HEIGHT -o BBD_NNNN.C8 That will create BBD_NNNN.C8, but note that you also need to specify its sample rate and frequency in another file, as explained below.

RINEX navigation file for GPS ephemerides

Download the latest file for this parameter directly from Nasa: https://cddis.nasa.gov/archive/gnss/data/daily/

Sample rate and frequency specification

Create BBD_NNNN.TXT with:

sample_rate=2600000
center_frequency=1575420000

Copy to your PortaPack MicroSD and open the file from the GPS Sim app.

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".

gps-sdr-sim.exe -e brdc3540.14n -g OUTPUT.nmea -d DURATION -o BBD_NNNN.C8

You also need to BBD_NNNN.TXT as specified above.

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:

• Turn off Wifi/BT/Cellular (airplane mode)
• Go inside, where the device loses GPS signal
• Reboot the device after doing the previous two steps

If the device runs Android, follow your attempts with GPS Test.

Known results

Type	Make	Model	Locks on spoofed GPS?	GPS acts "jammed"?	Comments
Tablet	Samsung	Note 7	No	Yes
Phone	Huawei	P30 lite	No	Yes
Phone	Huawei	Mate 10 Pro	No	Yes
Smartwatch	Huawei	Amazfit Bip	No	No
Phone	Apple	iPhone 6	Yes	No	Works with WIFI on

References

https://blog.csdn.net/shukebeta008/article/details/103270214