Determining sensor orientation in indoor navigation
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United States of America Patent
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Jun 13, 2017
Grant Date -
Dec 15, 2016
app pub date -
Jun 11, 2015
filing date -
Jun 11, 2015
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Abstract
A method and system are provided for improved pedestrian dead reckoning. In an embodiment, the crab angle of a device, i.e., the angle by which the device direction of travel differs from the device orientation, is determined via the processing of measurements from a vector accelerometer. The measured acceleration vector is rotated so that one component is vertical, and the crab angle is then found by determining a horizontal direction having the greatest energy. Correlations between the two horizontal acceleration components and the vertical acceleration component may be computed to determine the user's gait, further improving dead reckoning, e.g., for improving indoor position resolution.
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