Comment by Marc Ramsey on April 20, 2009 at 6:52am

You'd need three receivers for complete roll/pitch/yaw attitude determination. However, the results wouldn't be terribly accurate or repeatable, as the receiver system clocks won't be synchronized, resulting in relative timing errors which degrade the performance (1 nanosecond relative error = ~1 foot position error). Off-the-shelf GPS attitude systems use highly modified receiver hardware and firmware, which is reflected in their US $15000+ prices...

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