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Re: [Discuss-gnuradio] DBSRX used for GPS: cycle slip


From: Chris Stankevitz
Subject: Re: [Discuss-gnuradio] DBSRX used for GPS: cycle slip
Date: Mon, 02 Jun 2008 18:54:19 -0700
User-agent: Thunderbird 2.0.0.0 (Windows/20070326)

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




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