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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