US 11,808,838 B2
Motion state detection apparatus and method based on wireless signals and system
Qian Zhao, Beijing (CN); Jun Tian, Beijing (CN); Hongchun Li, Beijing (CN); Genming Ding, Beijing (CN); and Lili Xie, Beijing (CN)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by Fujitsu Limited, Kawasaki (JP)
Filed on Jan. 28, 2020, as Appl. No. 16/774,321.
Claims priority of application No. 201910249161.7 (CN), filed on Mar. 29, 2019.
Prior Publication US 2020/0309940 A1, Oct. 1, 2020
Int. Cl. G01S 13/62 (2006.01)
CPC G01S 13/62 (2013.01) 8 Claims
OG exemplary drawing
 
1. A microwave radar system, comprising:
a signal transmitter configured to transmit wireless signals to a space where an object is located;
a signal receiver configured to receive wireless signals reflected;
a memory; and
a processor coupled to the memory and configured to:
calculate variations of energy distribution of reflection points with time according to the wireless signals reflected, the wireless signals being microwave radar signals; and
determine a motion state of the object detected according to the calculated variations of energy distribution of reflection points with time, the motion state comprising a stationary state and a nonstationary state,
wherein the processor is configured to:
calculate distribution of energies of the reflection points at two moments relative to at least one of position information of the object and a moving speed of the object, and
calculate a similarity between distributions at the two moments, which measures the variations of energy distribution of reflection points with time.