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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