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Re: [Discuss-gnuradio] Tracking a Carrier Frequency

From: Don Latham
Subject: Re: [Discuss-gnuradio] Tracking a Carrier Frequency
Date: Thu, 6 Aug 2009 18:10:02 -0600 (MDT)
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Hi Thomas: What you propose might work; it's a simple bang-bang servo
frequency control. It's success depends a lot on the frequency
characteristics of the drift you are trying to track. I have absolutely no
idea about the difficulty of implementation in Gnuradio, I'm sure that
depends a lot on the rest of your app.

> Hello everyone,
> I have an application in which I need the USRP to track a carrier
> frequency being received. What I mean by "tracking the carrier" is I need
> the USRP to stay tuned to the carrier frequency even if the carrier
> frequency drifts (or if the USRP's frequency reference drifts).
> I was thinking that I could peridically (perhaps once per second) take the
> FFT, find the frequency of the greatest magnitude, and re-tune the USRP to
> this frequency.
> Is there any reason why this wouldn't work, and is there a better way? It
> seems to me this would be a common problem, and there would already be a
> good solution, but I haven't been able to find one.
> Thanks,
> Thomas
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> Discuss-gnuradio mailing list
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Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304

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