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: http://code.ettus.com/redmine/ettus/projects/uhd/wiki --n > Thanks, > Al > > > ----- Original Message ----- > From: "Nick Foster" <n...@ettus.com> > To: <discuss-gnuradio@gnu.org> > 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 > > Discuss-gnuradio@gnu.org > > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
