On Tue, Mar 06, 2007 at 04:57:55PM -0500, Gregory W Heckler wrote: > Brian: > > From what I see it does not continuously stream data, which is a > requirement for my needs. Additionally I am looking at recording GPS L2C > and the new Galileo frequencies, so a tuneable front end is a must. >
I'm pretty sure that it's capable of continuously streaming data. It's basically a GPS front end chip connected to an FX2. It might need a software tweak or two, but if they started with the USRP code, it'll stream by default. Eric > Brian Padalino wrote: > >On 3/6/07, Gregory W Heckler <[EMAIL PROTECTED]> wrote: > >>I've noticed that the DLL of my software receiver settles to +15 Hz, and > >>the true IF is +24 kHz from the predicted IF. This would indicate that > >>the 64 MHz board clock is ~1 kHz from its spec value. This, in itself is > >>not a problem, but I was wondering if this was within tolerances of the > >>onboard XO? > > > >I believe the XO on the USRP has a 50ppm spec, so 1kHz is well within that. > > > >>The real problem lies in the fact that the carrier tracking loop (a 3rd > >>order PLL) of my software receiver cannot achieve phase lock. The phase > >>jitter looks high, and the LO frequency drifts so much it dominates over > >>the Doppler derived from satellite motion. > >> > >>If anyone would like any GPS IF data I would be happy to email it to > >>your personal email address (indicate how many seconds of data you would > >>like). Thanks! > > > >On a side note, have you seen that SiGe device available from Spark > >Fun Electronics? I posted earlier today about it. It might be of > >interest? > > > > http://www.sparkfun.com/commerce/product_info.php?products_id=8238# > > > >Brian _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
