gps-sdr-sim VS gnss-sdr

Looking at the GitHub, I see the duration is defined by USER_MOTION_SIZE and can be specified in either dynamic or static mode. Can I get some insight on the benefits of using dynamic/static? I need to transmit a fixed GPS point, if that matters.

> not trivial or cheap

It sounds like your experience may have been a while ago? In 2022, it is fairly trivial and cheap: https://github.com/osqzss/gps-sdr-sim

I can not ;^) personally confirm that this works with a HackRF, which is like $300, but probably with any other reasonable tx-capable sdr.

Link of the repository: GPS-SDR-SIM

GPS-SDR-SIM

> while spoofing GPS is significantly harder

You are completely, utterly wrong. Spoofing GPS is downloading a file, and then running a commandline program with a hackrf attached.

Download and compile https://github.com/osqzss/gps-sdr-sim

Download today's ephermis 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.

I want to simulate GPS signals by using GPS-SDR-SIM (GPS-SDR-SIM GitHub page)

You realise you can write software yourself to interpret the signals from GPS satellites? Here's an open-source implementation.

Something I always enjoy pointing out is that GPS signals can be decoded by anybody, the source code is available here. Needless to say, there are references and calculations based on satellites all over it.

If you're interested in running some code, there's [1] which is fairly active, but as I recall is Linux only. There is also [2] which is a Matlab (or Octave) GNSS receiver implementation; quite well documented and informative. It's meant to be a companion to the author's book [3], which itself I found quite concise and approachable.

[1] https://github.com/gnss-sdr/gnss-sdr

They like to pretend it is using towers or balloons or something else, none of them have ever coherently answered it with a viable way this could result in the GPS we can use from the device in our pocket. It also casually expands the circle of people involved in this conspiracy by thousands, to include all developers at Apple and other phone manufacturers that write/maintain the GPS components of their OS as well as contributors to open source projects like GNSS-SDR, an open-source software-defined GNSS receiver.

People also have to write the software to compute your location from these broadcasts, this means basically every company that has produced GPS receivers would have to be in on it. But there's an open source one, surprisingly nobody has raised an issue as to why it contains all this weird code that doesn't make sense if it's not coming from a satellite.

GNSS-SDR