Method for detecting respiratory rate and heart rate of human body based on quadrature demodulation pulse ultra-wideband radar
A pulsed ultra-wideband, quadrature demodulation technology, applied in the directions of diagnostic recording/measurement, medical science, sensors, etc. Effect
Active Publication Date: 2020-09-22
SUN YAT SEN UNIV
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[0004] In view of the above-mentioned problems, the present invention provides a method for detecting human respiration rate and heart rate based on an orthogonal demodulation pulse ultra-wideband radar that solves at least some of the above-mentioned technical problems. The present invention is based on an orthogonal demodulation pulse ultra-wideband (IR-UWB) radar Measure the regular movement of the human chest caused by respiration and heartbeat to obtain the respiration rate and heart rate of the human body, achieving high accuracy of measurement values with low computational complexity
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[0035] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0036] refer to figure 1 As shown, the method for detecting human respiration rate and heart rate based on orthogonal demodulation pulse ultra-wideband radar provided by the embodiment of the present invention includes the following steps:
[0037] Include the following steps:
[0038] S10, the pulse ultra-wideband radar is initialized, and the pulse repetition frequency is set to 10 Hz;
[0039] S20, transmit the pulse signal th...
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The invention discloses a method for detecting the respiratory rate and heart rate of a human body based on quadrature demodulation pulse ultra-wideband radar. The method comprises the steps that thepulse ultra-wideband radar is initialized; a pulse signal is transmitted, and an echo signal is received; a signal after echo original digital sampling is obtained through analog-to-digital conversion, and the signal is converted into a quadrature demodulated radar echo I / Q signal; a phase difference is obtained; weighted average is carried out to obtain data of distance change between the thoracic cavity of a to-be-measured object and a radar antenna; a piece of sequence data is obtained; discrete Fourier transform is carried out to obtain a frequency domain signal of distance transform; andfrequencies corresponding to peak values of the signals within the heartbeat frequency range and the respiratory frequency range are obtained, and the frequencies are taken as heartbeat and respiratory frequencies of the corresponding to-be-detected object. According to the method, the respiratory rate and the heart rate of the human body are obtained by measuring regular movement of the thoraciccavity of the human body generated by respiration and heartbeat on the basis of quadrature demodulated pulse ultra-wideband radar; and compared with a traditional filter, the method has the advantagesthat the calculation complexity is reduced, and the significance degree of heart rate detection is improved.
Description
technical field [0001] The invention belongs to the field of non-contact physiological index measurement, in particular to a method for detecting human breathing rate and heart rate by orthogonal demodulation pulse ultra-wideband radar based on difference. Background technique [0002] Non-contact measurement can avoid many inconveniences caused by contact measurement. The patent publication number is: CN108577815A uses a Butterworth band-pass filter, and the complexity is relatively high. For the non-differential measurement method, due to the relationship between the respiration rate and the heart rate, the harmonics of the respiration signal have a great influence on the measurement of the heart rate. [0003] Therefore, in the prior art, the measurement method of human respiration rate and heart rate using ultra-wideband radar has a relatively high computational complexity, and there is still room for improvement in accuracy. Contents of the invention [0004] In vie...
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IPC IPC(8): A61B5/0205
CPCA61B5/0205A61B5/725
Inventor 刘倍典朱祥维陈哲正陶文宇
Owner SUN YAT SEN UNIV
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