> > Can you explain what modifications have to be done to support HackRF? >
I haven’t tested my code with HackRF, but it should work on any other SDR platform with proper data format and signal amplitude. The current 4MHz sampling rate can be too high for USB 2.0 on HackRF. You can change SAMP_FREQ to 2.6e6, and the corresponding IQ_BUFF_SIZE to 260000. Since HackRF stores I/Q sample pairs in signed 8-bit integers, you need to allocate iq_buff in “signed char”, instead of “short” for the 16-bit bladeRF format. The simulated I/Q samples will then be stored in “signed char” format as well with a proper ADC_GAIN. I think that all the modifications you need to playback the simulated I/Q data samples for HackRF with the transfer command: hackrf_transfer -t gpssim.bin -f 1575420000 -s 2600000 -a 1 -x 0
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