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Re: [Discuss-gnuradio] GPS with DBSRX, Almost There

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] GPS with DBSRX, Almost There
Date: Wed, 07 Mar 2007 10:42:10 -0800
User-agent: Thunderbird (X11/20070302)

Peter Monta wrote:
Martin Dvh wrote:

Maybe you could inject a stable frequency near the wanted RX frequency.
Say a few Mhz away from the 1.57542e9 you want to receive.
Then you could use this in the output to remove the jitter and LO drift.

for example:
inject 1600000000 Mhz (=25 harmonic of 64MHz) at the input (after the saw filter) This will result in 24.58 Mhz +jitter +LOdrift at the input of the USRP (after dbs_rx downmix)

I wonder if any 25th harmonic is already in the signal, by virtue
of leakage within the USRP itself?  That would be great.

The 25th harmonic will drift just as much as your signal, so it won't help. Martin's suggestion would only work with a signal with better stability. Of course, you already have some of those -- the stronger satellites.


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