Re: [Discuss-gnuradio] gr-air-modes: problem with uhd and USRP1

[Nick Foster]

On Wed, 2010-12-01 at 13:55 -0500, Allen Vinegar wrote:
> I am getting output like the following:
>  (-35) Type 11 (all call reply) from ac85cc in reply to interrogator 4
>  (-34) Type 11 (all call reply) from ac85cc in reply to interrogator 4
>  (-35) Type 11 (all call reply) from ac85cc in reply to interrogator 4
>  (-33) Type 4 (short surveillance altitude reply) from ac85cc at 5900ft
>  (-33) Type 0 (short A-A surveillance) from ac85cc at 5875ft
>  (-34) Type 11 (all call reply) from ac85cc in reply to interrogator 0
>  (-34) Type 0 (short A-A surveillance) from ac85cc at 5825ft
>  (-34) Type 0 (short A-A surveillance) from ac85cc at 5825ft
>  (-34) Type 0 (short A-A surveillance) from ac85cc at 5800ft
>  (-33) Type 0 (short A-A surveillance) from ac85cc at 5600ft
>  (-33) Type 0 (short A-A surveillance) from ac85cc at 5575ft
>  (-36) Type 11 (all call reply) from ac85cc in reply to interrogator 0
> 
> 
> 
> However I can't renewed output to GoogleEarth. On occasion I get a plane 
> showing as in the attached file but I can't get a continually renewing 
> display.

Those squitters don't contain any position information. The majority
(70% or so) of Mode S-equipped aircraft do not broadcast their position
via ADS-B. ADS-B packets are type 17 and you will see lat/lon in the
text when they come up.

The default KML settings only display aircraft which were heard in the
last 5 minutes. This is to prevent old data from being displayed on
screen. You can edit modes_kml.py to change that timeout if you like.

If your display doesn't auto-renew, look at the network link settings in
Google Earth. Make sure under the "Refresh" tab the "Time-Based Refresh"
is set to "Periodically" and set the timeout to 4 or 5 seconds.

--n

> 
> 
> Any ideas on how to fix?
> 
> 
> 
> Thank you,
> 
> Al Vinegar
> 
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "madengr" <address@hidden>
> To: <address@hidden>
> Sent: Monday, November 29, 2010 11:16 PM
> Subject: Re: [Discuss-gnuradio] gr-air-modes: problem with uhd and USRP1
> 
> 
> >
> > Nick,
> >
> > Got it working on my USRP2 by changing to line 57 to:
> > self.u = uhd.single_usrp_source("addr=192.168.1.15",
> > uhd.io_type_t.COMPLEX_FLOAT32)
> >
> > and line 119 to:
> > result = self.u.set_center_freq(freq,0)
> >
> > I'm getting 0 aircraft locations in the KML file but the stdout is as
> > follows:
> >
> > (-40) Type 11 (all call reply) from e9fc9f in reply to interrogator 5
> > (-41) Type 11 (all call reply) from 2c4e09 in reply to interrogator 0
> >
> > I assume these are Mode-S packets, thus no position info?
> >
> >
> > -- 
> > View this message in context: 
> > http://old.nabble.com/gr-air-modes%3A-problem-with-uhd-and-USRP1-tp30326133p30336873.html
> > Sent from the GnuRadio mailing list archive at Nabble.com.
> >
> >
> > _______________________________________________
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