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jim_gps · Guest

Hi,

I've just about completed my code to decode the WAAS subframe data, but
I've run into a problem in that about 5% of my WAAS packets are failing
the CRC check...! The problem is I've checked my code and I can't see a
problem - so I'm starting to wonder if there is a problem with my test
data which is sourced from a uBlox GPS module.

I've had a good google but can't find any example WAAS packet data on
the web... I don't suppose anyone out there knows where I could
download some test data from, or maybe knows of a GPS receiver that
outputs them that I could log for myself?

It's getting a little frustrating ;o)

Jim

MikeLee · Guest

Why don't you e-mail uBlox about your problem, maybe you helped them
found a bug and they might be happy to assist you.

There is a SigalTap hardware available from NavTech Suppy that output
raw IF data. I'm not sure if they supplied example code for extracting
data. But if you're able to write code to acquire and track GPS/WAAS
signal as in a SW GPS receiver, you could get to the very bottom of
things and decode the WAAS data bits you want.

Mike

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