Detection method for vital signs of human body target
A technology of human targets and vital signs, applied in the measurement of pulse/heart rate, medical science, sound wave diagnosis, etc., it can solve the problems of being unsuitable for long-distance weak signal detection, difficult to detect the micro-movement characteristics of human targets, etc., and achieve rapid heartbeat and respiration detection. Effect
Inactive Publication Date: 2013-10-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0005] The current non-contact detection is based on radar echo analysis, the micro-Doppler effect is affected by the radar carrier frequency, the traditional radar operating frequency is low, the micro-Doppler effect has little influence, and the micro-Doppler effect is detected in a lower frequency band Le modulation is unlikely, and the micro-movement characteristics (heartbeat, breathing) of human targets are more difficult to detect in a noisy environment, which is not suitable for the detection of long-distance weak signals
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[0018] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.
[0019] Terahertz waves refer to electromagnetic waves with frequencies ranging from 0.1THz to 10THz and wavelengths ranging from 3mm to 30um, between millimeter waves and infrared, and long-wave bands coincide with millimeter waves (submillimeter waves). The frequency of terahertz waves is very high, and the spatial resolution is very high. Terahertz radar technology can detect smaller targets and more accurate positioning than microwave radar, and has higher resolution and stronger confidentiality. Since the wavelength of the terahertz frequency band is much smaller than that of existing microwaves, it is more suitable for the realization of extremely large signal bandwidth and extremely narrow antenna beam, which is conducive to obtaining fine imaging of targets; the Doppler effect caused by object movement is more significant, which is condu...
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The invention discloses a detection method for vital signs of a human body target, which comprises the following steps: firstly, establishing a radar human body target echo signal model containing a micro-doppler effect; performing time-frequency analysis, thereby obtaining time-frequency energy distribution of the echo signal; optimizing the time-frequency energy distribution, thereby obtaining a centroid curve; and performing time-frequency analysis again, thereby extracting heartbeat frequency and breathing frequency. According to the detection method provided by the invention, the vital sign information of the human body target is confirmed by detecting doppler information of a terahertz radar echo; the echo signal is treated by repeatedly utilizing a time-frequency analysis method; the micro-moving information, such as heartbeat and breath, is lastly extracted; various inconveniences brought by contact detection are solved; and the quick heartbeat and breath detection can be performed on the human body target within a certain distance according to the detection method.
Description
technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a method for detecting vital signs of a terahertz radar human target by utilizing the micro-Doppler effect. Background technique [0002] Whether it is simple personal health monitoring, diagnosing chronic health conditions, or even searching for people in earthquakes or avalanches, being able to accurately detect heartbeat and breathing rates has a wide range of security applications. Heartbeat and breathing detection has many applications in military, biomedical and rescue operations. There are many ways to detect the heartbeat frequency, some are contact methods, and some are non-contact methods. [0003] Contact methods include: palpation heart rate measurement, ECG, heart sound, photoelectric pulse heart rate measurement, and respiratory belt breathing detection, etc. However, these detection methods mainly rely on contact sensors and electrodes...
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IPC IPC(8): A61B8/02A61B8/00
Inventor 李晋徐政五吴元杰皮亦鸣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA