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Re: [Discuss-gnuradio] Query on GPS

From: David Bengtson
Subject: Re: [Discuss-gnuradio] Query on GPS
Date: Fri, 25 Mar 2005 23:27:42 -0500
User-agent: Mozilla Thunderbird 1.0 (Windows/20041206)

GLONASS spec's are available on-line from Russia. Google found the site, and the spec is a decently sized Word document. The GPS L1 Freq is a CDMA signal at 1575.42 MHz, with a signal BW of~3 MHz. GLONASS is FDMA, with 25 500 kHz channels from 1589 to 1610 MHz. I suspect that you could design a receiver for both, although I haven't run through the spec's in any detail yet. It looks like the Maxim part I'm looking at would work, although the sample rate's may be off.


Robert Cicconetti wrote:

On Sun, 20 Mar 2005 21:33:21 -0000, Robert McGwier
<address@hidden> wrote:
We can do this I am sure.  I thank Dave and Krys for the advance
work they have been doing when not many (any?) were "listening".
If we allow the FPGA to do (carrier phase/code) (acquisition/tracking )
in a joint-detection process run on the FPGA, I believe we can do a 12
channel receiver.

I've been mostly lurking, but I have one question.. is it possible to
get position fixes from GLONASS birds as well? I suppose it depends on
the front end filters in the hardware interface. I know I seldom get a
12-satellite lock from just the GPS satellites. Are the two systems
different enough to eat an excessive amount of FPGA space?


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