[time-nuts] SDR GPS

bg at lysator.liu.se bg at lysator.liu.se
Wed Nov 30 02:35:59 EST 2011


> On 24/11/11 12:19, Poul-Henning Kamp wrote:
>>
>> Has any of you played with this:
>>
>> 	http://www.sparkfun.com/products/8238
>>
>
> I have. I managed to log data, write code to use FFT correlation search
> and then lock-up to a good strong bird and decode the sub-code.
>
> One has to look in a few books to "get it" but it's fun. Much harder to
> real-time decode, but I didn't spend quality time on achieving an
> efficient digital RF section.
>
> The dataformat is inefficient with only 2 out of 8 bits used, so one
> might consider stuffing the bits, but it would be a trivial fix.
>
> Cheers,
> Magnus

There is also a limitation in the orginal module limiting continous data
collection to 30(?) seconds. You need to remove a timer in the (USB)
microcontroller on the device and recompile. This was no problem with open
source tools.

--

   Björn





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