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> "Also, it would be nice to fool the GPS through a jammer that emits false signals in order to make it report a fake location, after placing cameras at that pl

> "Also, it would be nice to fool the GPS through a jammer that emits false signals in order to make it report a fake location, after placing cameras at that place to record whoever shows up." First : don't confuse jamming with spoofing. Jamming is extremely easy to perform by any idiot, while spoofing GPS is significantly harder https://archive.fosdem.org/2019/schedule/event/sdr_gps/ https://archive.fosdem.org/2019/schedule/event/sdr_gps/ Second : keep in mind that both of them are actually illegal in most countries, and besides unless you exactly know what you are doing it's fairly easy to jam/spoof on much larger areas than you would intend to ! (and GNSS is not restricted to consumer products and maps but are used in a lot of industrial/serious applications so it can actually have consequences)

squarefoot 5y ago
> spoofing GPS is significantly harder I recall seeing someone's project that did exactly that: transmitting at a very short distance a radio signal that spoofed a number of satellites so that the GPS receiver would report completely bogus positions. Anyway, that would be unnecessary as I completely missed that the GPS receiver is connected through a serial port, therefore spoofing NMEA strings would be much easier.
noasaservice 5y ago
> while spoofing GPS is significantly harder You are very wrong. Spoofing GPS is downloading a file, and then running a commandline program with a hackrf attached. The *only* hard part is getting a HackRF or other TX capable SDR. Download and compile https://github.com/osqzss/gps-sdr-sim https://github.com/osqzss/gps-sdr-sim Download today's ephermis https://cddis.nasa.gov/archive/gnss/data/daily/ https://cddis.nasa.gov/archive/gnss/data/daily/ run: gps-sdr-sim -e $EPHERMISFILE -l $LAT,$LON,$ALT And, if you're nearby an airport, you're violating felonies with FCC AND FAA.
- kragen 5y ago
  Jamming is easy enough that people do it by accident. There was a guy with a broken VCR a number of years back that got a visit from the FCC because it was jamming, I think, VOR beacons. Having a broken VCR is significantly easier than downloading a file and then running a commandline program with a hackrf attached.

squarefoot 5y ago

> spoofing GPS is significantly harder I recall seeing someone's project that did exactly that: transmitting at a very short distance a radio signal that spoofed a number of satellites so that the GPS receiver would report completely bogus positions. Anyway, that would be unnecessary as I completely missed that the GPS receiver is connected through a serial port, therefore spoofing NMEA strings would be much easier.

noasaservice 5y ago

> while spoofing GPS is significantly harder You are very wrong. Spoofing GPS is downloading a file, and then running a commandline program with a hackrf attached. The *only* hard part is getting a HackRF or other TX capable SDR. Download and compile https://github.com/osqzss/gps-sdr-sim https://github.com/osqzss/gps-sdr-sim Download today's ephermis https://cddis.nasa.gov/archive/gnss/data/daily/ https://cddis.nasa.gov/archive/gnss/data/daily/ run: gps-sdr-sim -e $EPHERMISFILE -l $LAT,$LON,$ALT And, if you're nearby an airport, you're violating felonies with FCC AND FAA.

kragen 5y ago
Jamming is easy enough that people do it by accident. There was a guy with a broken VCR a number of years back that got a visit from the FCC because it was jamming, I think, VOR beacons. Having a broken VCR is significantly easier than downloading a file and then running a commandline program with a hackrf attached.