DUAL DIFFERENTIAL DOPPLER MOTION DETECTION
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United States of America Patent
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Issued Date -
Jul 30, 2015
app pub date -
Jun 23, 2014
filing date -
Jun 21, 2013
priority date (Note) -
Abandoned
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Abstract
A motion detector has an RF transceiver configured to transmit a first frequency RF signal and a second frequency RF signal into an area where motion is to be detected. A frequency difference between the first frequency signal and the second frequency signal is small and chosen to cause a calculated range dependent Doppler phase shift between the first frequency and the second frequency. The two resulting Doppler shift signals have a frequency dependent on the movement speed of an object in the area, and a difference in amplitude or signal strength between the Doppler shift signals remains relatively invariant as a function of range for a moving object in the area in comparison with an amplitude or signal strength of the Doppler shift signals. Signal level or signal power of a difference in amplitude between the Doppler shift signals is analyzed for the purpose of movement or range detection.
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