US 12,216,191 B2
Methods, circuits, and apparatus for motion detection, doppler shift detection, and positioning by self-envelope modulation
Tse-Peng Chen, Taipei (TW)
Assigned to Richwave Technology Corp., Taipei (TW)
Filed by Richwave Technology Corp., Taipei (TW)
Filed on Mar. 23, 2020, as Appl. No. 16/826,584.
Claims priority of provisional application 62/886,293, filed on Aug. 13, 2019.
Claims priority of provisional application 62/827,635, filed on Apr. 1, 2019.
Prior Publication US 2020/0341133 A1, Oct. 29, 2020
Int. Cl. G01S 13/56 (2006.01); G01S 7/292 (2006.01); G01S 7/41 (2006.01); G01S 13/522 (2006.01)
CPC G01S 13/56 (2013.01) [G01S 7/2925 (2013.01); G01S 7/415 (2013.01); G01S 13/522 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for detecting motion of an object in an environment, comprising:
transmitting a first wireless signal related to a transmission signal and receiving a second wireless signal related to an incoming signal, wherein:
the transmission signal is a continuous wave signal,
transmitting the first wireless signal includes transmitting the first wireless signal based on an output signal provided by a power amplifier, and
the second wireless signal is a reflected first wireless signal from the object;
obtaining a modulation signal by combining the continuous wave signal and the incoming signal, wherein the modulation signal contains a Doppler shift caused by the motion of the object;
extracting a signal envelope varied by the Doppler shift from the modulation signal;
determining whether a first signal level of the signal envelope exceeds a first predetermined threshold and a second signal level of the signal envelope is lower than a second predetermined threshold, the first predetermined threshold being higher than the second predetermined threshold; and
responsive to a determination that the first signal level of the signal envelope exceeds the first predetermined threshold and the second signal level of the signal envelope is lower than the second predetermined threshold, determining detection of the motion of the object.