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Extraction method and device of breath and heartbeating signals in life probe radar

A heartbeat signal and life detection technology, which is applied in the field of breathing and heartbeat signal extraction, can solve problems such as failure to achieve expected results

Active Publication Date: 2011-04-20
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

However, the radar receiving signal is affected by the nonlinear image of the system, and often encounters signals that do not belong to the additive combination. If a single linear filter is used to separate and process these signal components, the expected effect cannot be achieved.

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  • Extraction method and device of breath and heartbeating signals in life probe radar
  • Extraction method and device of breath and heartbeating signals in life probe radar
  • Extraction method and device of breath and heartbeating signals in life probe radar

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Embodiment Construction

[0063] like figure 1 As shown, a method for extracting breathing and heartbeat signals in a life detection radar, the specific process is as follows:

[0064] Step S10, preprocessing the radar received signal. Specifically, the radar receiving signal is low-pass filtered to filter out high-frequency noise, thereby improving the signal-to-noise ratio.

[0065] Step S20, performing empirical mode decomposition on the preprocessed signal to obtain a limited number of intrinsic mode functions. The Empirical Mode Decomposition (EDM) algorithm can deal with nonlinear and non-stationary signals. Compared with the wavelet transform, it does not need to select a basis function, but adaptively decomposes into a limited number of intrinsic modes according to the characteristics of the signal itself. Function (Intrinsic Mode Function, imf), different imfs reflect the evolution characteristics of the signal on different time scales, so the breathing and heartbeat signals can be extracted...

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Abstract

The invention provides extraction method and device of breath and heartbeating signals in life probe radar. The method comprises the following steps of: pre-processing a radar receiving signal; carrying out empirical mode decomposition to the pre-processed signal to acquire finite inherent modal functions; quickly carrying out Fourier transform to each decomposed inherent modal function; respectively calculating total capacity, breath frequency band capacity and heartbeating frequency band capacity corresponding to each inherent modal function; and selecting the corresponding inherent modal functions according to the proportion relation of the total capacity, breath frequency band capacity and heartbeating frequency band capacity to respectively reconstruct breath and heartbeating signals. By adopting the method and the device provided by the invention, the breath and heartbeating signals can be extracted more accurately, thereby the invention has the self-adaptation characteristic and can be adapted to the change of the environment.

Description

【Technical field】 [0001] The invention relates to the technical field of signal processing, in particular to a method and device for extracting breathing and heartbeat signals in a life detection radar. 【Background technique】 [0002] Through-wall life detection radar integrates radar and biomedical engineering technology, can penetrate non-metallic media (such as brick walls, ruins, etc.), non-contact, long-distance detection of human breathing and heartbeat and other information, widely used in shock post-rescue, special patient care, and anti-terrorism fights. [0003] The basic principle of the through-wall life detection radar is: the transmitter generates a continuous wave signal cos(2πf 0 t), radiated from the transmitting antenna to the target, the continuous wave signal penetrates non-metallic obstacles, and returns after encountering the target. The echo signal enters the low-noise amplifier through the receiving antenna, and then performs preprocessing after fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0205G01S7/02
Inventor 潘水洋李烨王强吴晶
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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