[Hackrf-dev] Adding HackRF support to dump1090

[Tom]

Well done.

 

Look forward to trying this out.

 

From: HackRF-dev [mailto:hackrf-dev-bounces at greatscottgadgets.com] On Behalf Of Ilker Temir
Sent: Sunday, 28 June 2015 11:49 AM
To: Donald Pupecki
Cc: hackrf-dev at greatscottgadgets.com
Subject: Re: [Hackrf-dev] Adding HackRF support to dump1090

 

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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