Subsampling Motion Detector for Detecting Motion of Object Under Measurement
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United States of America Patent
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Nov 14, 2019
app pub date -
Jul 25, 2019
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Jun 6, 2016
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Abstract
A subsampling motion detector used to detect motion information of an object under measurement receives a first wireless radio frequency (RF) signal and transmits a second wireless RF signal, the first wireless RF signal being generated by reflecting the second wireless RF signal from the object. The subsampling motion detector has a high frequency oscillator for outputting a high frequency oscillation signal, a low frequency controllable oscillator for generating a low frequency oscillation signal according to a control signal, and a subsampling analog-to-digital converter (SSADC). The SSADC detects a phase difference between the high frequency oscillation signal and the low frequency oscillation signal at time periods indicated by the low frequency oscillation signal. The SSADC outputs a phase detection digital output signal according to the detected phase difference. The control signal is generated and the motion information of the object is calculated according to the phase detection digital output signal.
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