There've been numerous threads on the Gnuradio mailing list about code to receive GPS using the Ettus Research USRP hardware. I don't know whether anyone has actually made it work, but it appears that it's been the subject of quite a few academic projects.

John
----

On 2/1/2012 4:28 AM, Attila Kinali wrote:
On Tue, 31 Jan 2012 16:21:40 -0800
"Tom Van Baak"<t...@leapsecond.com>  wrote:

We're waiting for some brave soul to implement an SDR-based
GPS timing receiver; we can all then experiment with the TBolt
model instead of the TIC/DAC model of GPSDO.

I'm planning that... I don't think it's too difficult to do, given
all the information (papers and books) that are available on how
to build GPS receivers. But it will be a damn lot of work.
So don't hold your breath. It will probably take a couple of years
until i even get around to design a board for it, not to mention to
write all the code.

                        Attila Kinali


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