I had never heard of fastGPS; sounds pretty useful. What is the end goal for your receiver?
Ryan On Tue, Nov 29, 2011 at 5:10 AM, Nick Othieno <nickothi...@gmail.com> wrote: > I am using fastGPS to do the correlation as well as writing my own MATLAB > correlation scripts. > > Nick > > > On Fri, Nov 25, 2011 at 8:40 PM, Nick Foster <n...@ettus.com> wrote: > >> On Fri, Nov 25, 2011 at 7:01 AM, Nick Othieno <nickothi...@gmail.com> >> wrote: >> > 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. >> >> I've successfully used a DBSRX + active antenna to receive GPS signals >> before. What software are you using to do the correlation and find the >> L1 signal? >> >> --n >> >> > >> > Nick >> > >> > On Fri, Nov 18, 2011 at 9:47 AM, Wolfarth, Ryan <wolfa...@muohio.edu> >> 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 <bpadal...@gmail.com> >> >> wrote: >> >>> >> >>> 2011/11/18 山本弘貴 <k.yamamoto.0...@gmail.com>: >> >>> > 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 >> >>> Discuss-gnuradio@gnu.org >> >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> >> >> >> _______________________________________________ >> >> Discuss-gnuradio mailing list >> >> Discuss-gnuradio@gnu.org >> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> > >> > >> > _______________________________________________ >> > Discuss-gnuradio mailing list >> > Discuss-gnuradio@gnu.org >> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > >> > >> > >
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