Re: [Discuss-gnuradio] usrp dbsrx to use in seti and radioastronomy

[Dallas Masters]

We have the same plan here: purchase a USRP and dbsrx daughterboards
for GPS (GNSS) processing.  In the past, we used Zarlink GP2015/2021
chipsets to build GPS receivers and bistatic radar instruments
(http://www.opengps.net).  The GP2015 front end receives C/A only, but
is well designed.  The problem is that Zarlink is going to discontinue
the GPXXXX line.  So we are moving toward SDR techniques.  David B.'s
C/A front-end work with the Maxim chip could be a good solution with
the USRP.  Anyway, we hope we can contribute to the GNSS code
development.

Dallas

Krzysztof Kamieniecki <address@hidden> writes:

> Hi Ben,
>
> Have you taken a look at GNURadio wiki? Specifically the GPS page.
> http://comsec.com/wiki?GlobalPositioningSystem
>
> I have some code for software GPS at http://www.kamieniecki.com/krys/gps/
>
> My project has been sidetrack by a contract project I am working on using
> GNURadio. At this point I have decided on a way to integrate my existing GPS
> code with GNURadio so that the few people who are using my code to process raw
> data do not have to use GNURadio. I have created a GNURadio block that wraps 
> my
> GPS signal generator. The next step is to create a block that wraps my GPS
> Correlator, and then a block that wraps my low level GPS Receiver (a set of
> synchronized Correlators with a state machine controllers to track the signals
>>From the various GPS satellites) I ordered the dbsrx with the hope that at
> least to possibility of getting realtime GPS signal data may spur me on.
>
> Regards,
> Krys
>
> Quoting Marcus Leech <address@hidden>:
>> Ben Loftin wrote:
>> 
>> > Could you elaborate on what you mean by seeing GPS L1.  Does this me 
>> > acquisition, tracking, seeing bumps on an FFT, etc.  I ask because I 
>> > am starting to build up algorithms for a GPS receiver to use with 
>> > USRP.  I just finished the first simple one of generating the C/A code 
>> > for each satellite.  You can check it out on on my blog at 
>> > http://www.phys-x.org/grblog/grblog.html (try the link 
>> > http://64.6.242.226/grblog/grblog.html since the higher domain 
>> > registers need some time to refresh).
>> >
>> > Anybody else developing code for GPS so we can pool our efforts?
>> >
>> > Ben
>> 
>> I just saw the appropriate spectral bumps--I don't have a GPS processor.
>> 
>> 
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-- 
Dallas Masters, Ph.D.
Research Associate
Aerospace Engineering Sciences
CB 431 / CCAR
University of Colorado
Boulder, CO 80309-0431
(303) 492-4075