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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 09:21:08 -0500
User-agent: Mozilla Thunderbird 1.0 (Windows/20041206)


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


Krzysztof Kamieniecki wrote:

I love replying to myself.

I updated my website with a plot showing the results of a correlator doing a brute force search thru frequency and delay on the real raw data.

Krzysztof Kamieniecki wrote:

I am, slowly but surely. I plan on using the USRP.
I recently got some raw data from a person associated with GPStk if you are interested.

Right now David Bengtson is working on a daughter card.

Other links of interest
My page: http://www.kamieniecki.com/krys/gps/
GnuRadio GPS page: http://comsec.com/wiki?GlobalPositioningSystem

Robert McGwier wrote:

Who is working on a GPS receiver for the USRP or other hardware
in this project?  I would like not to do duplication of effort.


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