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robojet

DGPS accuracy

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I have been playing around with a TinyTrak and noticed that the resolution of the NMEA data is in increments of .0001 minutes, which calculates to 0.093 m in latitude, and 0.093*cos(latitude) in longitude and if two identical GPS units are operating in the near vicinity, it seems like it would open many possibilites for an auto-landing plane or putting a giant scale servo on the steering wheel of my full scale truck and take a trip with a manikin behind the wheel. Does anybody know what the actual performance of differential correction data on an ordinary GPS is? Seems like it would be accurate to within a meter unless tall buildings might interfere with the signal or the receivers were listening to different satellites.

Kyle

Edited by robojet

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