Imaging method for large dynamic range Doppler biological signal

A Doppler biological and large dynamic range technology, applied in the field of large dynamic range Doppler biological signal imaging, can solve problems such as limitations and DC offset uncertainty

Inactive Publication Date: 2014-07-30
ZHEJIANG UNIV
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  • Claims
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Problems solved by technology

However, due to the uncertainty of the DC offset in the quadrature baseband signal, the limitation of the value range of the general arctangent operation leads to the phase ambiguity pro...

Method used

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  • Imaging method for large dynamic range Doppler biological signal
  • Imaging method for large dynamic range Doppler biological signal
  • Imaging method for large dynamic range Doppler biological signal

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Experimental program
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Embodiment approach

[0026] like figure 1 As shown, the radio frequency front-end module includes a transmitting antenna TX and a receiving antenna RX. First, the electromagnetic wave is transmitted to the surface of the moving organism to be tested through the antenna TX; the receiving antenna RX receives the reflected signal, and then the down-conversion module digitally and quadraturely down-converts the reflected signal to two baseband signals: signal Q and signal I; The signal undergoes a dynamic circle center tracking algorithm to remove the useless DC component and retain the useful DC component, and then the phase information demodulated by the extended arctangent algorithm is not limited by the phase ambiguity, thereby recovering the motion information of the measured object.

[0027] Its specific working process is as follows:

[0028] 1) The RF front-end module transmits a single-frequency carrier electromagnetic wave signal to the surface of the moving organism to be tested, and is re...

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Abstract

The invention discloses an imaging method for a large dynamic range Doppler biological signal. A radio frequency front end module emits electromagnetic waves to the surface of a moving living body to be detected by an antenna; a lower frequency conversion module performs digital and orthogonal down-conversion on a signal reflected back to a base band signal; a dynamic circle center tracking algorithm is performed on the base band signal, a useless direct component is removed, a useful direct component is kept, and the characteristic that phase information demodulated by an expanding antitangent algorithm is not limited by phase ambiguity, so that the motion information of the measured object is recovered. Compared with a traditional non-contact biological signal detection system which can only detect small-amplitude motion of the sub-wavelength level, a system related to the method has the advantages of multiple functions and application scenarios, the limitation of the small amplitude motion can be broken through, the method is applied to detection on meter-level multi-wavelength large-amplitude motion, and the related non-contact large-amplitude motion detection applications in the biomedical field and the like are realized.

Description

technical field [0001] The invention relates to a Doppler biological signal imaging method, in particular to a Doppler biological signal imaging method for a large dynamic range. Background technique [0002] In recent years, researchers at home and abroad have made great progress in the study of small-scale motion detection such as non-contact heart rate measurement using electromagnetic waves. However, due to the uncertainty of the DC offset in the quadrature baseband signal, the limitation of the value range of the general arctangent operation leads to the phase ambiguity problem, and the detection of large dynamic range motion, especially the detection of large-scale motion at multiple electromagnetic wave wavelength levels has been limited. Extremely restrictive. Contents of the invention [0003] The purpose of the present invention is to provide a Doppler biological signal imaging method for large dynamic range. Compared with the traditional non-contact biosignal ...

Claims

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Application Information

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IPC IPC(8): A61B5/024A61B5/11
Inventor 吕勤毅冉立新
Owner ZHEJIANG UNIV
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