FGFS-4.1/adsb-out
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README.md

"ADS-B Out" add-on for SoftRF-Emu, Stratux, etc...

This repository contains "ADS-B Out" encoder for Tx-capable SDR hardware.

It is currently written is architecture independent Python language and can be used as an add-on for existing open source "ADS-B In" solutions. One known good example is Stratux.

Disclaimer

The source code is published for academic purpose only.

Instructions

  1. Execute ADSB_Encoder.py script with <ICAO> <Latitude> <Longtitude> <Altitude> arguments:
$ ADSB_Encoder.py  0xABCDEF 12.34 56.78 9999.0
$ ls Samples.iq8s
Samples.iq8s
$
  1. Make the raw signal file aligned to 256K buffer size:
$ dd if=Samples.iq8s of=Samples_256K.iq8s bs=4k seek=63
1+0 records in
1+0 records out
4096 bytes (4.1 kB) copied, 0.00110421 s, 3.7 MB/s
$
  1. Transmit the signal into air:
$ hackrf_transfer -t Samples_256K.iq8s -f 868000000 -s 2000000 -x 10
call hackrf_sample_rate_set(2000000 Hz/2.000 MHz)
call hackrf_baseband_filter_bandwidth_set(1750000 Hz/1.750 MHz)
call hackrf_set_freq(868000000 Hz/868.000 MHz)
Stop with Ctrl-C
 0.5 MiB / 1.000 sec =  0.5 MiB/second

User cancel, exiting...
Total time: 1.00038 s
hackrf_stop_tx() done
hackrf_close() done
hackrf_exit() done
fclose(fd) done
exit
$

Validation

$ sudo dump1090 --net --freq 868000000
...

References