Positioning............. :-) On Tue, Nov 29, 2011 at 9:55 AM, Wolfarth, Ryan <wolfa...@muohio.edu> wrote:
> 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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