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Signal processing algorithm of non-contact type vital sign monitoring system

A technology for vital signs and signal processing, applied in the field of radar, can solve the problems of phase correctness, demodulation amplitude error, demodulation result influence, etc., to achieve the effect of high calculation accuracy and strong practical applicability

Inactive Publication Date: 2013-05-01
NANJING UNIV OF SCI & TECH
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Problems solved by technology

At present, the commonly used signal processing algorithm for processing the vital signs monitoring system is arctangent method phase demodulation. When using this algorithm, the test conditions are very strict, that is, the two signals obtained by the front-end analog dual-branch quadrature demodulation need to be strictly Orthogonal, otherwise it will have a great impact on the correctness of the demodulated phase, and at the same time, the noise generated by the system itself and the amplitude error of the demodulated wave will affect the demodulation result

Method used

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  • Signal processing algorithm of non-contact type vital sign monitoring system
  • Signal processing algorithm of non-contact type vital sign monitoring system
  • Signal processing algorithm of non-contact type vital sign monitoring system

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] combine figure 1 , figure 2 and image 3 ,

[0040] The analog terminal sends two quadrature signals as well as ,

[0041] After step 11 get , after step 12 to get ,

[0042] After step 13 get , after step 14 to get ,

[0043] After step 15 get , after step 16 to get ,

[0044] After step 21 get (or ),

[0045] Since the given example is zero mean, the result obtained after step 22 is the same as step 21, that is (or ).

[0046] After step 23 get (or )

[0047] After step 24, the two eigenvalues ​​are 8.5949 and 0, and the corresponding eigenvectors are and , (or two eigenvalues ​​of 199.198 and 0, the corresponding eigenvector is and ),

[0048] After step 25, the result of step 26 is the heartbeat principal component (or breath principal components ).

[0049] Obtain real-time heartbeat waveform thro...

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Abstract

The invention discloses a signal processing algorithm of a non-contact type vital sign monitoring system. The signal processing algorithm comprises the following steps of step 1, respectively carrying out heartbeat signal and breathing signal separation on the received signals of a path I and a path Q; step 2, extracting the main components of heartbeat and breathing by a main component analyzing algorithm; and step 3, respectively carrying out smooth conversion and Fourier conversion on the heartbeat and breathing components obtained in step 2, so as to obtain the waveforms and the frequencies of heartbeat and breathing. The signal processing algorithm has the advantages that the effectivity and the reliability are realized, the vital sign signals can be monitored in a real-time way, the monitoring precision is high, and the real-time performance is high.

Description

technical field [0001] The invention belongs to the field of radar, and especially designs a signal processing algorithm of a non-contact vital sign I household system. Background technique [0002] Heartbeat and breathing are important physical characteristics of the human body. At present, the commonly used signal processing algorithm for processing the vital signs monitoring system is arctangent method phase demodulation. When using this algorithm, the test conditions are very strict, that is, the two signals obtained by the front-end analog dual-branch quadrature demodulation need to be strictly Orthogonal, otherwise it will have a great impact on the correctness of the demodulated phase, and at the same time, the noise generated by the system itself and the amplitude error of the demodulated wave will have an impact on the demodulation result. The present invention can effectively solve the above problems. Contents of the invention [0003] The purpose of the presen...

Claims

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Application Information

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IPC IPC(8): A61B5/08
Inventor 洪弘朱晓华李彧晟李洪涛顾陈黄剑
Owner NANJING UNIV OF SCI & TECH
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