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Permalink Reply by swordfishBob on July 22, 2011 at 6:39pm

Hi,
I don't yet have experience with this in a UAV environment, but have been working on a ground-vehicle GPS project. You'll likely find the relationship between speed and DOP varies significantly between different modules based on number of satellites tracked, sensitivity, and smoothing algorithms. At low speeds in open country, the absolute positional error will be fairly slow-changing once the visible satellites are locked, so speed and heading will be more accurate than position, except for the occasional jump as satellite selection changes. At higher speeds and with less reliable signal, your error will flop around more, though if you're doing 190km/h does it really matter whether it's 180 or 200 (apart from bragging rights)? I'm guessing 200km/h would be more likely in open terrain where signal is better.

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