Re: [Discuss-gnuradio] Query on GPS

[David Bengtson]

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.

Dave

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?
>
> R C
>
>
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