High speed high resolution ultrasonic position and orientation tracker
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United States of America Patent
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Aug 16, 1994
Grant Date -
N/A
app pub date -
Jul 10, 1992
filing date -
Jul 10, 1992
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A continuous wave ultrasonic tracking system using an ultrasonic transmitter acoustically radiating a continuous wave ultrasonic transmitted signal and an ultrasonic receiver detecting the transmitted signal as a received signal. The system mixes the transmitted and received signals to create an interference pattern characterized by interference fringes, counts the number of the fringes by which the pattern changes with respect to a fixed point and stores the number as a number of wavelengths of the displacement between the transmitter and receiver, interpolates a location of the fixed point between successive ones of the interference fringes as a fraction of a wavelength and stores the fraction of a wavelength and computing the displacement by combining the number of wavelengths and the fractional number of wavelengths.
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