Hi Ryan, What did you use for your setup, ie daughterboards, antenna and LNA (if you do not mind my asking). I have been trying a setup for months that uses a DBSRX2 and a mighty mouse 2 antenna only, but I have never been able to acquire the L1 signal. I am wondering where I have gone wrong in the setup.
Nick On Fri, Nov 18, 2011 at 9:47 AM, Wolfarth, Ryan <[email protected]> wrote: > Hi folks, > > My group is using USRPs to do the task Kouki described, although our flow > diagram is a little different. We only use the USRP2 to receive the raw RF > data which is written to file. This data is processed to the point where > we decode the navigation bits, but no position is ever found. We're more > interested in the effects of ionosphere scintillations on GNSS signal > structure so we don't need to calculate antenna position. > > I can recommend two books that have helped me immensely. The Kaplan "blue > book:" > > > http://www.amazon.com/Understanding-GPS-Principles-Applications-Second/dp/1580538940/ref=sr_1_1?ie=UTF8&qid=1321627222&sr=8-1 > > And the Kaplan "blue book:" > > http://www.gpstextbook.com/ > > I do know of a group that has used a USRP1 to develop a 4 channel L1 > receiver, but they had to modify the FPGA to do all the real time > processing. Let me know if you have additional questions! > > -Ryan > > > On Fri, Nov 18, 2011 at 7:56 AM, Brian Padalino <[email protected]>wrote: > >> 2011/11/18 山本弘貴 <[email protected]>: >> > Hi, All >> > I have very trouble >> > My experiment enviroment isUBUNTU 11.04 , USRP N200, DBSRX2 ,active >> > antenna and gnuradio >> > I am worrying about good software GPS receiver is not exist . >> > I want to receive L1 signal , and want to demodulate that signal >> > However GPS signal is used Spread spectrum modulation scheme. >> > I try to creating gnuradio-companion's blocks.(use to Spread spectrum >> > demodulation blocks) >> > but that is very difficult so Now I think method is >> > >> > GPS L1 signal → USRP N200 → gnuradio-companion(UHD_source→File_sink) >> > → software decode soft → output(Location data) >> > >> > >> > Eventually I want to Calculate location data, >> > Please let me know if you're a good this way >> >> I recently came across this product listing at Spark Fun: >> >> http://www.sparkfun.com/products/10981 >> >> Which has a link to a book all about GPS receiving and even comes with >> MATLAB source code: >> >> >> http://www.amazon.com/Software-Defined-GPS-Galileo-Receiver-Single-Frequency/dp/0817643907 >> >> I am sure, with the source, you could adapt it to use the USRP >> recorded signal, and then possibly port the MATLAB over to either >> Python (using Josh's signal processing in Python blocks) or straight >> C++. >> >> > I am sorry that My English is not good >> > >> > Kouki >> >> Good luck - it's definitely not a trivial task, but it sounds extremely >> fun. >> >> Brian >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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