22 Jan
2014
22 Jan
'14
4:54 p.m.
I know someone who's reveiving FIS-B with a GDL 39, although his
home base is about 100 km north-east. I'm somewhat confident that
I should have the coverage. One problem is, from what I heard,
the ground stations will not broadcast anything until a UAT-equipped
aircraft checks in.
Regardless, I was hoping that Nick or other experts chime in on
the code itself. Honestly I have no clue what I'm doing here.
I imagine that if signal is present, then vector pointed by Q+jI
rotates at ~300 revolutions per second. Therefore, I calculate
the phase angle difference between two samples taken at twice
the UAT bit rate and see if it's anywhere reasonable. It may
be a bogus technique for any number of reasons.
-- Pete
On Wed, 22 Jan 2014 08:25:57 -0800
David Jacobowitz <david.jacobowitz(a)gmail.com> wrote:
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