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Re: [Discuss-gnuradio] Gnuradio Mode S project released

From: Allen Vinegar
Subject: Re: [Discuss-gnuradio] Gnuradio Mode S project released
Date: Sun, 24 Oct 2010 12:24:30 -0400

Thanks for quick answer!


----- Original Message ----- From: "Nick Foster" <address@hidden>
To: "Allen Vinegar" <address@hidden>
Cc: <address@hidden>
Sent: Sunday, October 24, 2010 12:18 PM
Subject: Re: [Discuss-gnuradio] Gnuradio Mode S project released

On Sun, 2010-10-24 at 12:15 -0400, Allen Vinegar wrote:
What would be involved in running this with a USRP2 and WBX?

Download, compile, run. You should plug an antenna in at some point in
the process.

If you aren't using UHD yet, you'll have to download and install UHD and
gr-uhd as well as burn a new SD card image. Instructions for that
process are here:



----- Original Message ----- From: "Nick Foster" <address@hidden>
To: <address@hidden>
Sent: Saturday, October 23, 2010 9:52 PM
Subject: [Discuss-gnuradio] Gnuradio Mode S project released

> Hi all,
> I finally got around to cleaning up my Mode S receiver enough for > public
> release. The following is a short description of the software:
> The Gnuradio Mode S project implements a Mode S/ADS-B receiver. Mode S
> is the latest aircraft transponder technology, primarily used in
> commercial aircraft. Probably 30% of those aircraft currently broadcast
> their position via ADS-B (more in Europe, less in the US), which is a
> protocol that uses Mode S extended squitters as the transport layer. By
> 2020 all aircraft operating in controlled US airspace will be required
> to broadcast ADS-B.
> The receiver demodulates and decodes the 1090MHz PPM-modulated Mode S
> transmissions using industry-standard techniques to mitigate FRUIT
> (transmissions on top of one another) and correct multiple bit errors.
> Using a USRP with a DBSRX + LNA + SAW filter, ranges of 220 miles have
> been regularly seen. The WBX should allow similar ranges without the
> filter and LNA, although I haven't really tested WBX much. It is of
> course line-of-sight, making antenna site selection important.
> TL;DR: Follow airplanes around from 200 miles with your USRP.
> The receiver allows interfacing to a number of output formats, > including
> KML for Google Earth. Screenshots of the Google Earth interface can be
> found here:
> http://nerdnetworks.org/~bistromath/photos/adsb/
> There is also a TCP port 30003 interface to use with PlanePlotter, a
> third-party application to view aircraft data. PlanePlotter isn't free,
> and I haven't tested it at all, so while it should work, YMMV. If you > do
> test it, let me know.
> There are definitely still bugs in it -- one thing that comes to mind > is > that a very few aircraft seem to produce data which uses correct > headers
> for position packets but which contains non-position data. This causes
> "impossible" aircraft positions. Luckily it seems to be pretty rare.
> Future developments for the receiver include implementation of > networked
> multilateration using the VRT timestamps of USRP2. Multilateration
> allows the time-based triangulation of aircraft which use Mode S but
> which do not broadcast ADS-B. Three or more networked USRP2s should
> allow position determination to a reasonable degree of accuracy.
> Clone the Git repository to build the software with the usual
> bootstrap/configure/make/make install rigmarole; it should compile on
> anything you have Gnuradio installed on, although with a 4Msps data > rate
> it does require a bit of CPU power. In order to use the KML output you
> will have to have libsqlite3 and python-sqlite installed, although > since
> those are Python dependencies it will still compile without them. I
> think that's it for the dependencies. Oh, it uses UHD, so you should
> finally get around to building UHD and gr-uhd to use this software.
> git clone git://github.com/bistromath/gr-air-modes.git
> There is also a CGRAN page with corresponding SVN repo, which is a
> mirror of the Github repo:
> https://www.cgran.org/wiki/gr-air-modes/
> The Python executable is src/python/uhd_modes.py.
> Best,
> Nick
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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