Another failure of decoding UAT

David Jacobowitz david.jacobowitz at gmail.com
Wed Jan 22 16:25:57 UTC 2014


This may be dumb because I haven't looked into it, but is it reasonable to
expect to receive a signal?

Are you in the US? There really aren't that many UAT equipped aircraft yet.
The FAA is rebroadcasting ADSB ES responses on UAT as well as providing
weather and other data, but that is all coming from ground stations. If you
need line of sight and you're on the ground yourself you may be out of luck.

- Dave J
On Jan 22, 2014 7:36 AM, "Pete Zaitcev" <zaitcev at kotori.zaitcev.us> wrote:

> The hardware receives the Extended Squitter at 1090 MHz, so we may
> assume that it works. I'm using a little monopole antenna sized for
> 978 MHz for this, sitting right on the connector.
>
> -- Pete
>
> On Wed, 22 Jan 2014 12:35:35 +0200
> Nikos Balkanas <nikos.balkanas at eyeonix.com> wrote:
>
> > Have you checked your hardware? Mostly antenna and grounds...
> >
> > BR,
> > Nikos
> >
> >
> > On Wed, Jan 22, 2014 at 6:54 AM, Pete Zaitcev <zaitcev at kotori.zaitcev.us
> >wrote:
> >
> > > Guys,
> > >
> > > As you know, our sample rate is not good enough to decode UAT's FSK in
> > > a conventional way, so I thought to try something else: use 2 samples
> > > per bit to detect the frequency shift. This is obviously unreliable,
> > > but I hoped to see something at least. But it didn't work: seems like
> > > decoding noise.
> > >
> > > The code is here:
> > >  https://github.com/zaitcev/ruat
> > >
> > > Anyone is willing to critique? Where did I go wrong?
> > >
> > > Thanks,
> > > -- Pete
>
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