Quote:
Originally Posted by dtengineering
There are also neat tricks for improving GPS accuracy. One of the less expen sive ones... although not a particularly useful one for real-time robotics applications... is to leave your GPS sitting in one place for an hour or so and record all the positional readings (they will fluctuate a bit). Then you compare them to the readings of a nearby receiver at a known location. Since some of the errors in your signal are caused by random atmospheric fluctuations, and since a nearby receiver will have similar fluctuations, then the errors between the two sets of readings should be similar. Since the reference receiver is at a known location, it will be possible to determine a known error, and modify the results for the mobile GPS unit. I suppose this technique could be modified to offer real-time benefits, but I don't know if I'd want to do that on a VEX platform.
Jason
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WAAS (wide area augmentation system) does this for you on relatively new GPS receivers. it takes what the satellites are giving and compares it to a known location (WAAS station)