[Hackrf-dev] Attempting to Transmit GPS Using the HackRF One

[Mark Lachniet]

When I did this, I found that phones are harder to trick than a regular 
GPS.  Are you trying a navigation GPS?

If you are using only smartphones, the signal may be going out, but 
whatever logic the phone is using (possibly the presence of WLAN 
networks) deems the data unreliable and doesn't use it.  Try turning on 
a regular car GPS like a Garmin or Nuvi, it may show the location you 
desired (at least that was what happened to me)

Mark

On 7/9/2020 4:59 PM, John Akin wrote:
> I am working on a project that involves a GPS receiver and I need a 
> GPS generating device to produce test data.  I thought the HackRF One 
> sounded perfect for the job.
> I have gone through the tutorial videos on Great Scott Gadget’s site 
> and implemented the FM radio project, so I believe that I have 
> verified my HackRF is definitely working as an FM receiver.  Now I am 
> seeking guidance in the transmitting of GPS.
> I found several tutorial videos on line that make it look easy enough 
> and, following their examples, I have been using the HackRF transfer 
> command to transmit the GPS signal (the command syntax I have used is, 
> “hackrf_transfer -t .\gpssim.bin -f 1575420000 -s 2600000 -a 1 -x 0 -C 
> 2 -R.”)
> I see the Transmit LED is on, as I would expect, but I am not having 
> luck in verifying the transfers are occurring using apps for either 
> Android phones, or iPhones.  The GPS location reported by these aps is 
> my physical location no matter what coordinates I supply.
> I have also connected, via SMA cable, the HackRF to my project and the 
> GPS receiver does not appear to be receiving GPS coordinates either.  
> The GPS sentences it reports contain no latitude or longitude values.
> Anyone have any recommendations?
> Thanks!
>
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