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
<[EMAIL PROTECTED]> 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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