Method and system for positional measurement using ultrasonic sensing
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United States of America Patent
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Aug 16, 2011
Grant Date -
Aug 12, 2010
app pub date -
Apr 20, 2010
filing date -
Nov 28, 2005
priority date (Note) -
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Abstract
A method for determining position and alignment is provided. The method includes monitoring a first and second sequence of ultrasonic signals transmitted from the first device to a second device, estimating a location of the first device from Time of Flight measurements of the ultrasonic signals at respective microphones on the second device, calculating a set of phase differences, weighting a difference of an expected location and estimated location of the first device with the set of phase differences to produce a relative displacement, and reporting a position of the first device based on the relative displacement.
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