ULTRASONIC LOCATIONING USING FLIGHT TIME CALCULATED FROM COUNTER OFFSETS
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United States of America Patent
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Issued Date -
Feb 12, 2015
app pub date -
Aug 9, 2013
filing date -
Aug 9, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Using counter offsets to allow flight time calculation in an ultrasonic locationing system includes ultrasonic transmitters for emitting ultrasonic bursts, each transmitter having a counter and a synchronization server. A backend controller schedules periodic bursts from each transmitter. A mobile device also has a counter and can receive the ultrasonic bursts, wherein the mobile device can determine a relative counter offset between itself and a transmitter. The mobile device can calculate a corrected reception time of ultrasonic bursts from the transmitters based on the counter value when the burst is detected and the relative counter offset between the mobile device and the transmitter, and report the corrected time to the backend controller for locationing of the mobile device.
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