[time-nuts] SDR GPS

k4cle at aol.com k4cle at aol.com
Wed Dec 7 18:24:30 EST 2011


You may want to take a look at:


Regards, Doug, K4CLE

Connected by DROID on Verizon Wireless

-----Original message-----
From: Magnus Danielson <magnus at rubidium.dyndns.org>
To: time-nuts at febo.com
Sent: Wed, Nov 30, 2011 00:18:40 GMT+00:00
Subject: Re: [time-nuts] SDR GPS

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.


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