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1. (WO2019026076) CONTACTLESS DETECTION AND MONITORING SYSTEM OF VITAL SIGNS OF VEHICLE OCCUPANTS
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Claims:

1. A method for determining the vital signs of an occupant in a vehicle comprising:

transmitting a radar signal to the occupant and receiving the radar signal reflected from the occupant;

analyzing the reflected radar signal with respect to vibration data of the vehicle to produce a modified signal: and,

analyzing the modified signal to determine the vital signs of the occupant.

2. The method of claim 1 , wherein the vital signs include one or more of breathing rate, heart rate and heart rate variability.

3. The method of claim 1 , wherein the radar signal is from Doppler radar.

4. The method of claim 1 , wherein the reflected signal is obtained in analog form and is converted to a digital form, and the modified signal includes a modified digital signal.

5. The method of claim 4, wherein the vital sign to be measured is breathing rate of the occupant and the radar signal reflected from the occupant results in a signal based on breathing rate harmonics.

6. The method of claim 2, wherein the vital sign to be monitored includes heart rate.

7. The method of claim 6 where the heart rate is determined by processes including:

obtaining the modified signal;

dividing the modified signal into segments, each segment corresponding to a frequency,

analyzing a plurality of peaks of the segment for harmonics, including, for each peak:;

applying weight factors to each of the harmonics;

accumulate the energy from the harmonics as multiplied by the weight factors; and,

determining the peak with the highest accumulated energy.

8. The method of claim 7, wherein the peak determined to have the highest accumulated energy corresponds to the heart rate.

9. The method of claim 2, wherein the determining heart rate variability includes the processes of:

obtaining the modified signal;

determine the artifacts in the modified signal;

analyzing the modified signal for consecutive peaks between the artifacts; and,

determining a portion of the modified signal with at least a predetermined number of consecutive peaks; and,

calculating the heart rate variability parameters from the modified signal with at least a predetermined number of consecutive peaks.

10. The method of claim 1, additionally comprising: dividing the reflected signal into a first pathway for respiration rate frequencies and a second pathway for the heart rate frequencies, prior to the analyzing of the reflected signal.

11. A method of decreasing the impact of movement by a subject on the heart rate measurements for the subject, by filtering the heart rate fundamental frequency and determining the signal by analyzing the signal harmonics.

12: A method of decreasing the impact of movement by a subject on the heart rate

measurements by focusing proximately positioned radar at the aorta area.

13: A method of decreasing the impact of movement by a subject on the breathing rate measurements by focusing proximately positioned radar at the diaphragm area.

14. The method of claim 12 or 13, wherein the aorta area is between the LI and L5 vertebrae.

15. The method claim 1, wherein the vibration data is obtained from an inertial measurement unit.

16. A system for determining the vital signs of a subject comprising:

a radar transceiver for transmitting a signal to the subject and receiving the signal reflected from the subject;

a signal converter for converting the reflected signal to a converted signal for processing by a processor;

a vibration detection unit for detecting vibrations local to the subject and providing data representative of the local vibrations; and,

a processor in electronic communication with the signal converter and the vibration detection unit, programmed to: a) analyze the converted signal with respect to vibration data, to produce a modified signal, and b) analyze the modified signal to determine the vital signs of the occupant.

17. The system of claim 16, wherein the processor programmed to analyze the modified signal to determine the vital signs of the occupant, determines the vital signs including one or more of breathing rate, heart rate, and heart rate variability.

18. The system of claim 16, wherein the vibration detection unit includes and inertial measurement unit (EVIU).

19. The system of claim 16, wherein the signal converter includes an analog to digital converter (ADC).

20. The system of claim 16, additionally comprising: a filtration and amplification circuit in electronic communication with the radar transceiver and the signal converter, including two passband pathways for separating respiratory rate frequencies and heart rate frequencies of the reflected signal.

21. The system of claim 16, wherein the radar transceiver, the signal converter, the processor and the vibration detection unit define a single sensor unit.

22. A method for determining a vehicle occupant based on vital signs, comprising:

transmitting a radar signal to vehicle cabin and receiving the reflected signal;

analyzing the reflected signal with respect to vibration data of the vehicle to produce a modified signal: and,

analyzing the modified signal to determine the presence of vital signs in the vehicle cabin; and,

should the vital signs be present, an occupant has been detected in the vehicle cabin.

23. A method for determining the minimum gain level in a filtering and amplification circuit comprising:

generating a harmonic waveform;

transmitting the waveform and receiving the reflected waveform;

modifying the gain level of an amplifier in the filtering and amplification circuit to detect the reflected waveform.

24. The method of claim 23, performed in a vehicle cabin.

25. The method of claim 24, wherein the vehicle cabin is empty of occupants.

26. A method for determining the number of occupants in a vehicle comprising:

transmitting a radar signal into the vehicle cabin, and receiving the radar signal reflected from one or more occupants;

analyzing the reflected radar signal with respect to vibration data of the vehicle to produce a modified signal: and,

analyzing the modified signal to determine vital signs of the occupants; and,

based on the number of vital signs detected, determining the number of occupants in the vehicle cabin.