Systems and methods for respiratory rate measurement

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;
• processing said one or more frames to obtain information corresponding to the cardiopulmonary movement of the subject or a part of the subject, substantially separate from non-cardiopulmonary motion or other signal interference;
• estimating the subject's respiratory rate from the cardiopulmonary movement information;
• and
• communicating the information to an output system that is configured to perform an output action.

A system for sensing motion using a motion sensor, the system comprising:

• a source of radiation configured to generate electromagnetic radiation, wherein the frequency of the electromagnetic radiation is in the radio frequency range;
• one or more transmitters configured to transmit the electromagnetic radiation towards a subject;
• one or more receivers configured to receive a radiation scattered at least by the subject;
• a processor configured to:
• extract a Doppler shifted signal from the scattered radiation;
• transform 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;
• process said one or more frames to obtain information corresponding to the cardiopulmonary movement of the subject or a part of the subject, substantially separate from non-cardiopulmonary motion or other signal interference;
• estimate the subject's respiratory rate from the cardiopulmonary movement information;
• and
• a communication system configured to communicate the information to an output system that is configured to perform an output action.