My current thought's on a GPS front end is to make it GPS specific, as
there are Receiver's on a chip that take care of the details' of
downconversion, filtering, etc. The downside is that it's pretty single
purpose, and doesn't really support anything else. In other words, no
wideband front end on this. If I recall, Matt Ettus was talking about a
wideband RF front end for the USRP.
Dave
Robert McGwier 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.
In addition to this, Brickle and I have specific interests in
Cognitive Radio usage of the USRP as a wideband front end and
likely hooking this in to a system with a narrow band SDR to
prosecute the signal in a higher dynamic range regime. We are
extremely interested in active antenna work as well. I would
like to be doing four channel beam steering by the time of
AMSAT-NA symposium this fall.
Bob
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf
Of Eric Blossom
Sent: Sunday, March 20, 2005 6:34 PM
To: [EMAIL PROTECTED]
Cc: Krzysztof Kamieniecki; [email protected]
Subject: Re: [Discuss-gnuradio] Query on GPS
On Sun, Mar 20, 2005 at 09:21:08AM -0500, David Bengtson wrote:
Hi:
I'm still working on this slowly. I've selected the Maxim 2745 as the
best part available that is reasonably accessible. I've ordered and
received samples of the part from Maxim, and am starting to work on a
block diagram, followed by a schematic. This is looking like a RX module
to plug into the USRP board, and feed data into the FPGA for down
sampling and filtering.
Question for folks on the mailing list. I'm a hardware engineer, and am
more adept in programming in Matlab and solder than Python. Are there
enough folks out there that would be interested in helping with the
software to make this feasible, as I'm certainly not the guy to write
the code. I do feel competent to do the block diagram for the software,
although Krys is probably more up to speed on that. My guess is that we
would need ~ 2 to 3 folks writing code to demodulate the GPS signal and
turn it into a location. We can talk about generating hardware, as it
looks like the GPS board by itself will be pretty cheap, although costs
will have to wait until I have BOM
Dave
I'll make sure (probably with some help from Matt) that we get the
daughterboard glued into the GNU Radio framework.
Between Krys, Bob and others, I'm sure we've got plenty of folks
willing to work on the actual GPS signal processing.
If you build it, they will come ;-)
Eric
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