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I have made the circuitry for Vehicle tracking device now I'm stuck in the code of Atmel AVRmega2561, which is supporting with flash memory.

Please advise from where should I start.

Syed Mehdi
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    [What have you tried?](http://mattgemmell.com/2008/12/08/what-have-you-tried/) – Some programmer dude May 24 '12 at 11:42
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    You'll have to explain where you're stuck and what your thinking is so far. Questions like this hardly get answered, because there's not really a specific question to answer. – Chris A. May 24 '12 at 11:52
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    Yes. "where do I start" is very general, and you haven't given much specifics on what exactly you've tried so far. Mostly questions like this might not even get an answer - for future questions, show us the code you've tried, and the problems you've encountered (eg the error messages) and ask for specific help with each error you have received. – Taryn East Jul 13 '12 at 00:28

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Start by learning a bit about the Kalman Filter, which will allow you to filter the GPS data.

To help more, we would need to see the circuits and know what you have tried and/or what your experience is.

Alex Chamberlain
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  • Modern GPS chips will do that filtering for you. You can pretty much take their output at face value and throw it directly at your business logic. – MSalters May 24 '12 at 12:55
  • They have all the gyros etc in them? – Alex Chamberlain May 24 '12 at 13:10
  • Eh, no, but gyro's are unrelated to Kalman filters (or position in general, usually - the normal use is heading/bearing). Accelerometers are the one dubious bit, but considering modern GPS accuracy you ignore the accelerometer as long as the GPS fix is good. – MSalters May 24 '12 at 13:20
  • My mind went blank on accelerometers. GPS is still only accurate to 100 metres though, right? – Alex Chamberlain May 24 '12 at 13:49
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    Standard deviation is ~2 meters. Galileo (European GPS) will push it to 1 meter. (It's good enough for my employer to count how many lanes a highway has: the GPS traces of cars on different lanes are sufficiently distinct) – MSalters May 25 '12 at 07:13