reading packets direct from the radarbox

[brianmc]

has anyone written a program that will read the packets direct from the radarbox?

The data and the way it is presented does not quite suit my desires.  And I don't get routes for most of my flights....I would like to do something about that

thanks for any and all ideas.

[AirNav Development]

You can access data in real-time on the application's port 30003. To access raw data information contact our support at [email protected]

[brianmc]

support@airnav   was NO help...in fact they refused to help.

So if anyone has tried reading data direct from the radar box I would interested to know what you learned.

Thanks

[tarbat]

Well, I hope Airnav don't mind me posting this - I hope it simply illustrates the futility of attempting this.

I have tried reading data direct from the radar box, and this is what I learnt.  All you will see is a phase modulated signal in its raw form.  Some charting of the signal shows that you would also need to shift bit values to align on word boundaries, and the amount you need to shift fluctuates over time.

So, taking this packet as an example:
11 60 7f 80 7f 87 87 80 7f 00 7f 80 78 78 70 78
78 78 38 78 78 7f 80 7f 00 7f 00 78 7f 87 80 78
7f 80 7f 07 87 c7 80 7f 80 78 7c 70 78 7f 80 7f
00 7c 78 7f 87 c7 87 83 00 78 00 0a

With a phase shift of -3, gives this waveform:


This looks like a phase modulated, 56-bit short squitter with preamble - A DF11 for 400A99.

Good luck developing software to process the raw data.

[tarbat]

And I don't get routes for most of my flights....I would like to do something about that

You could try feeding port 30003 data into Planeplotter, and then use FD7 to generate routes.  It's still unreliable, since there is no source of route data that's 100% (or even 60%) complete and accurate.