Re: [Gpstk-devel] Interfacing my software receiver with GPSTK - use RINEX?

[Jon C. L. <li...@ar...>]

GPSTk is an excellent tool to do the lat/lon math and RINEX I/O. The 
navigation processing, such as converting the navigation bits into 
engineering units, computing navigation solution, filtering and 
coordinate frame transformation can be done without any every touching 
RINEX. See the gpstk documentation at www.gpstk.org. Look at the 
EngNav/EngAlm/EngEph classes for nav data cracking and PRSolution for 
the nav solution. See the RinexObs* and RinexNav* classes when you want 
to output raw observations. All of these classes are part of the GPSTk 
library in src.

The RINEX specification isn't called an ICD so just google for Rinex. I 
know the US Coast Guard keeps a copy online. Note that the GPSTk doesn't 
support v3 yet. We have plans for it but they aren't underway yet.

Also, I have also written a software receiver simulation that is in the 
apps directory of the GPSTk. I call it a simulation because it is not 
intended to operate in real time. It currently does the nav 
demodulation/cracking but not a nav solution.

jcl

Chris Stankevitz wrote:
> Hi guys,
>
> I wrote a C++ software receiver that takes input from the USRP (a RF 
> front end and ADC that send the bits over USB).  My software implements 
> acquisition and tracking loops.  My tracking loops are nav bit aligned 
> so I have the zeros and ones of the navigation message available.
>
> I'd love to use GPSTK to "do the math" to determine lat/lon.  My 
> understanding is that GPSTK takes RINEX formatted data, which I do not 
> currently output.
>
> Q: Do I need to format my data as RINEX to use GPSTK to come to nav 
> solution?
>
> Q: Where can I find a copy of the RINEX ICD so I can format my data 
> appropriately.  Believe it or not I couldn't find something like this on 
> google.
>
> Thanks!
>
> Chris
>
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