Patent ID: 10788559

Abstract:
The invention provides for an instrument (100, 300) comprising: a radio-frequency antenna (102) comprising multiple antenna elements (104); a radio-frequency system (106) comprising independent receive channels for receiving a radio-frequency signal (140) from each of the multiple antenna elements; a memory (130) containing machine executable instructions (160, 162); and a processor (124) for controlling the instrument. Execution of the machine executable instructions causes the processor to: control (200) the radio-frequency system to receive the radio frequency signal from each of the multiple antenna elements; extract (202) a noise signal (142) from the radio frequency signal from each of the multiple antenna elements; calculate (204) a normed signal (144) for each noise signal by applying a mathematical norm to each noise signal; calculate (206) a covariance (146) of the normed signal between each of the multiple antenna elements; calculate (208) a motion signal (148) by summing each covariance of the normed signal; and detect (210) motion of a subject by detecting a motion event (150) in the motion signal.