Non-contact physiologic motion sensors and methods for use

A method of sensing motion using a motion sensor, the method comprising:

• generating electromagnetic radiation from a source of radiation, wherein the frequency of the electromagnetic radiation is in the radio frequency range;
• transmitting the electromagnetic radiation towards a subject using one or more transmitters;
• receiving a radiation scattered at least by the subject using one or more receivers;
• extracting a Doppler shifted signal from the scattered radiation;
• transforming the Doppler shifted signal to a digitized motion signal, said digitized motion signal comprising one or more frames, wherein the one or more frames comprise time sampled quadrature values of the digitized motion signal;
• demodulating said one or more frames using a demodulation algorithm executed by a processor to isolate a signal corresponding to a physiological movement of the subject or a part of the subject;
• analyzing the signal to obtain information corresponding to a non-cardiopulmonary motion or other signal interference;
• processing the signal to obtain information corresponding to the physiological movement of the subject or a part of the subject, substantially separate from said non-cardiopulmonary motion or other signal interference;
• and
• communicating the information to an output system that is configured to perform an output action,
• wherein demodulating said one or more frames comprises:
• computing in the processor a first set of covariance matrices of a first subset of frames selected from said one or more frames and a second set of covariance matrices of a second subset of frames selected from said one or more frames;
• determining a first A-matrix, wherein the first A-matrix comprises a weighted sum of the first set of covariance matrices;
• determining a first parameter vector corresponding to a first primary value of the first A matrix;
• storing the first parameter vector in a memory device which is in communication with the processor
• determining a second A-matrix, wherein the second A-matrix comprises a weighted sum of the second set of covariance matrices;
• determining a second parameter vector corresponding to a second primary value of the second A-matrix;
• calculating an inner product of the first parameter vector and the second parameter vector;
• multiplying the second parameter vector by the sign of the inner product and
• projecting the values of the second frame on the second parameter vector to obtain the demodulated signal.