We have the same plan here: purchase a USRP and dbsrx daughterboards for GPS (GNSS) processing. In the past, we used Zarlink GP2015/2021 chipsets to build GPS receivers and bistatic radar instruments (http://www.opengps.net). The GP2015 front end receives C/A only, but is well designed. The problem is that Zarlink is going to discontinue the GPXXXX line. So we are moving toward SDR techniques. David B.'s C/A front-end work with the Maxim chip could be a good solution with the USRP. Anyway, we hope we can contribute to the GNSS code development.
Dallas Krzysztof Kamieniecki <[EMAIL PROTECTED]> writes: > Hi Ben, > > Have you taken a look at GNURadio wiki? Specifically the GPS page. > http://comsec.com/wiki?GlobalPositioningSystem > > I have some code for software GPS at http://www.kamieniecki.com/krys/gps/ > > My project has been sidetrack by a contract project I am working on using > GNURadio. At this point I have decided on a way to integrate my existing GPS > code with GNURadio so that the few people who are using my code to process raw > data do not have to use GNURadio. I have created a GNURadio block that wraps > my > GPS signal generator. The next step is to create a block that wraps my GPS > Correlator, and then a block that wraps my low level GPS Receiver (a set of > synchronized Correlators with a state machine controllers to track the signals >>From the various GPS satellites) I ordered the dbsrx with the hope that at > least to possibility of getting realtime GPS signal data may spur me on. > > Regards, > Krys > > Quoting Marcus Leech <[EMAIL PROTECTED]>: >> Ben Loftin wrote: >> >> > Could you elaborate on what you mean by seeing GPS L1. Does this me >> > acquisition, tracking, seeing bumps on an FFT, etc. I ask because I >> > am starting to build up algorithms for a GPS receiver to use with >> > USRP. I just finished the first simple one of generating the C/A code >> > for each satellite. You can check it out on on my blog at >> > http://www.phys-x.org/grblog/grblog.html (try the link >> > http://64.6.242.226/grblog/grblog.html since the higher domain >> > registers need some time to refresh). >> > >> > Anybody else developing code for GPS so we can pool our efforts? >> > >> > Ben >> >> I just saw the appropriate spectral bumps--I don't have a GPS processor. >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Dallas Masters, Ph.D. Research Associate Aerospace Engineering Sciences CB 431 / CCAR University of Colorado Boulder, CO 80309-0431 (303) 492-4075 _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
