POS MV V4 User Guide
Introduction
Copyright © Applanix Corporation, 2009
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GAMS heading error is largely due to GNSS receiver noise and multipath
errors. By blending this information with the IMU data in the Kalman Filter,
POS MV can average the GAMS heading error down to a blended heading
accuracy of typically 0.02° RMS (0.03° for WaveMaster) or better.
The Kalman Filter uses information in the IMU coordinate frame. POS MV
must therefore rotate GNSS heading information into this frame.
After alignment, the IMU delivers measurements of vessel heading relative to
true north. These possess an accuracy of ±0.02° RMS (±0.03° for
WaveMaster) or better, independent of vessel manoeuvres or latitude.
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