Multi-Source Doppler Radar System for Monitoring Cardiac and Respiratory Functions and Positioning of Vehicle Seat Occupant

A seating system for a vehicle comprising:

• a vehicle seat with a seatback;
• a first sensor positioned at a first location within the seatback corresponding to an anatomical location of a heart of a person sitting in the seat, the first sensor is configured to transmit a first signal from behind the person toward the anatomical location of the heart and to receive a first reflected signal of the first signal reflected from the person as modulated by a movement of the heart and by a random motion of the person relative to the location of the first sensor, wherein the first reflected signal includes a component corresponding to the movement of the heart and a component corresponding to the random motion of the person relative to the first location of the first sensor;
• a second sensor positioned in front of the person at a second location within the vehicle corresponding to the anatomical location of the heart, the second sensor is configured to transmit a second signal from in front of the person toward the anatomical location of the heart and to receive a second reflected signal of the second signal reflected from the person as modulated by the movement of the heart and by the random motion of the person relative to the location of the second sensor, wherein the second reflected signal includes the component corresponding to the movement of the heart and a component corresponding to the random motion of the person relative to the second location of the second sensor;
• wherein the component of the first reflected signal corresponding to the random motion of the person relative to the first location of the first sensor and the component of the second reflected signal corresponding to the random motion of the person relative to the second location of the second sensor are additive inverses of one another;
• and
• a controller configured to combine the first and second reflected signals to generate a biometric signal having the component corresponding to the movement of the heart and being void of the components corresponding to the random motion of the person relative to the locations of the first and second sensors whereby the biometric signal is indicative of cardiac information of the person.

A seating system for a vehicle comprising:

• a vehicle seat with a seatback and a seat bottom;
• a first sensor positioned at a first location within the seatback corresponding to an anatomical location of a heart of a person sitting in the seat, the first sensor is configured to transmit a first signal from behind the person toward the anatomical location of the heart and to receive a first reflected signal of the first signal reflected from the person as modulated by a movement of the heart relative to the first location of the first sensor, wherein the first reflected signal includes a first component corresponding to the movement of the heart relative to the first location of the first sensor;
• a second sensor positioned at a second location within the seat bottom corresponding to the anatomical location of the heart, the second sensor is configured to transmit a second signal from beneath the person toward the anatomical location of the heart and to receive a second reflected signal of the second signal reflected from the person as modulated by the movement of the heart relative to the second location of the second sensor, wherein the second reflected signal includes a second component corresponding to the movement of the heart relative to the second location of the second sensor;
• and
• a controller configured to process the first and second reflected signals to extract the first component from the first reflected signal based on a correlation with the second component of the second reflected signal and to generate a biometric signal having the first component whereby the biometric signal is indicative of cardiac information of the person.