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Re: [Discuss-gnuradio] Query on GPS

From: David Bengtson
Subject: Re: [Discuss-gnuradio] Query on GPS
Date: Sun, 20 Mar 2005 20:04:33 -0500
User-agent: Mozilla Thunderbird 1.0 (Windows/20041206)

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.


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.

-----Original Message-----
From: address@hidden
[mailto:address@hidden Behalf
Of Eric Blossom
Sent: Sunday, March 20, 2005 6:34 PM
To: address@hidden
Cc: Krzysztof Kamieniecki; address@hidden
Subject: Re: [Discuss-gnuradio] Query on GPS

On Sun, Mar 20, 2005 at 09:21:08AM -0500, David Bengtson wrote:

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


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 ;-)


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