[Hackrf-dev] Adding HackRF support to dump1090

[Ilker Temir]

Thanks! signed to unsigned conversion was the culprit. I first tested it 
with cox by converting the file and then tweaked my code to do that 
within the receive path.

I now have a working port of dump1090 to HackRF. I need to do some 
cleanup but as soon as done, will post it on GitHub and announce on this 
forum.

On 6/27/15 1:29 PM, Donald Pupecki wrote:
>
> I don't believe hackrf_transfer and rtl_sdr output in the same format. 
> They are both 8 bit but the hackrf output is signed whereas the rtl 
> output is unsigned.
>
> If you get this working a hackrf please post the port on github or 
> somewhere as that would be sweet.
>
> On Jun 27, 2015 4:00 PM, "Ilker Temir" <ilker at ilkertemir.com 
> <mailto:ilker at ilkertemir.com>> wrote:
>
>     Hello,
>
>     I am trying to add HackRF support to Salvatore Sanfilippo's
>     dump1090 tool (https://github.com/antirez/dump1090) as a learning
>     exercise. The tool was originally designed for RTL SDR devices.
>     However, I can't seem to get this port to work.
>
>     To eliminate potential issues in my code, I simplified the
>     troubleshooting steps. Here are the basic set of troubleshooting
>     steps I am using:
>
>     Per tool's documentation, a data file can be captured with rtl_sdr
>     utility in the following way:
>
>             rtl_sdr -f 1090000000 -s 2000000 -g 50 output.bin
>
>     Then you can pipe it into dump1090 like this:
>             dump1090 --ifile output.bin
>
>     I made an assumption that the HackRF equivalent of rtl_sdr command
>     above would be the following:
>
>             hackrf_transfer -r output.bin -f 1090000000 -s 2000000 -p
>     0 -a 0 -l 40 -g 62
>
>     However, capturing packets with HackRF this way and piping them
>     into dump1090 doesn't do anything. I have tried this sitting next
>     to an airport and capturing packets while planes were landing and
>     taking off. I don't have an RTL SDR dongle so I can't test the
>     rtl_sdr command myself. It didn't make to sense to buy a RTL SDR
>     device after HackRF but if I can't crack this, I am considering to
>     buy one.
>
>     BTW, I also tried different gain settings, and sample rate of 8e6
>     with hackrf_transfer, no difference. That said, I never enabled
>     amp_enable.
>
>     Would anyone know if rtl_sdr and hackrf_transfer capture the
>     packets in the same way and format? Or do I need to do some kind
>     of a conversion or translation in between the two to make them
>     compatible?
>
>     Any help or idea will be appreciated.
>
>     P.S. I am aware of gr-air-modes for HackRF to decode ADS-B
>     signals. My goal is to hack dump1090 and add HackRF support as a
>     learning exercise.
>
>     Thanks,
>
>     Ilker
>
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