Have you ruled out the USRP overflowing? I have had that problem bite me too. It causes all of the tracking channels to dump in my receiver, but I could see how it could also cause a jump in the frequency estimate (delay in time domain == shift in frequency domain) coming out of your FFT acquisition.
-----Original Message----- From: [EMAIL PROTECTED] on behalf of Chris Stankevitz Sent: Mon 6/2/2008 8:54 PM To: Heckler, Gregory W. (GSFC-596.0) Cc: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] DBSRX used for GPS: cycle slip Heckler, Gregory W. (GSFC-596.0) wrote: > I was referring to the Doppler estimate output by your PLL over time > (traditional tracking), whereas > you indicated that you were looking at repeated acquisition attempts. Greg, While performing traditional tracking with a PLL using "prompt" accumulations, I noticed my PLL could not keep track. As a debugging tool I conducted repeated acquisitions and it was there I noticed that the freq was suddently changing -- aha the source of my PLL problem! This image should give you an idea of what we are doing. It's a matlab plot of various outputs from our traditional tracker. http://img233.imageshack.us/img233/4064/gpswm9.gif Thanks, I will take a look at the frequency being passed to DBSRX. Chris _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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