Walter, Currently the receiver that triggers our USRPs to record the RF data is quite expensive. We don't use all of its features, but it has a few key parameters that are used in our trigger threshold calculation. If we deploy this same system to another location we'd like to have a USRP function as the trigger. In that sense we are interested in using the USRP as a GNSS receiver, but our goal isn't to get a position solution.
As far as performance metrics go, you need to define a few parameters for your receiver before settling on the USRP as a host. The two that pop into my mind right away are: 1.) which GPS signal(s) do you want to use and 2.) how many channels do you hope to track? If I recall correctly, there's a thread somewhere on this list where a group used the old USRP1 and modified the FPGA to do 4 channel tracking with fast acquisition. Regards, Ryan On Mon, Oct 3, 2011 at 11:56 AM, Walter Barmak <wbar...@proguidemc.com>wrote: > Hi Ryan, > > Thanks very much for your answer! You mean you are inetersted in > developing a stand alone receiver "with" the USRP? > > I'm sorry, what do you mean by performance metrics? > > thanks again, > Walter > > On Mon, 2011-10-03 at 15:52 -0300, Wolfarth, Ryan wrote: > > Hi Walter, > > > > My group is using the USRP to record raw RF data at GPS and GLONASS > > frequencies. We do all of our signal processing in post right now, > > but are interested in developing a stand alone receiver. If you > > search the mailing list you'll find some other folks who are > > implementing GPS receivers on the FPGA. What kind of performance > > metrics are you hoping to obtain? As far as the daughter boards go, > > we use the RFX1200 and RFX1800. I've also heard of people using the > > SBX. > > > > I have no answer to your question regarding OpenGTS: I'm fairly new to > > this system as well. If you're going to do real time tracking your > > best bet is probably to modify the FPGA for performance > > considerations. Hope this helps! > > > > Ryan > > > > On Mon, Oct 3, 2011 at 11:00 AM, Walter Barmak > > <wbar...@proguidemc.com> wrote: > > hi, > > > > i was wondering whether the usrp can be used as a "gps > > receiver". if so, > > 1) how can i achieve this? > > > > 2) any link you could provide for me to read? > > > > > > 3) what daughterboards should be used? > > > > 4) Can the usrp be used with OpenGTS (for example) for > > tracking (usrp as > > a gps receiver)? > > > > thanks in advance, > > walter > > > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > >
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