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A method of micro-doppler signal analysis based on combination of linear canonical transform and S-transform

A technology of micro-Doppler signal and analysis method, applied in the field of micro-Doppler signal analysis of linear canonical transformation combined with S-transform

Inactive Publication Date: 2016-12-14
NANJING UNIV OF SCI & TECH
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Problems solved by technology

Due to the fixed shape of the basic transformation function in the S-transform, it is limited in application

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  • A method of micro-doppler signal analysis based on combination of linear canonical transform and S-transform
  • A method of micro-doppler signal analysis based on combination of linear canonical transform and S-transform
  • A method of micro-doppler signal analysis based on combination of linear canonical transform and S-transform

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Embodiment Construction

[0043] combine figure 1 , the concrete process of the present invention is as follows:

[0044] Step S1, constructing a linear canonical transformation model of the echo signal;

[0045] Step S2, obtaining the time-shift characteristics of the echo signal after the linear canonical transformation;

[0046] Step S3, constructing an S-transform model of the echo signal;

[0047] Step S4, substituting the echo signal after the linear canonical transformation into the S-transform model;

[0048] Step S5, performing linear coordinate transformation after integrating the S-transform model based on the time-shift characteristic of the linear canonical transformation;

[0049] Step S6, obtaining the parameter matrix in the linear canonical transformation model;

[0050] Step S7, adjusting the parameter matrix to obtain the optimal frequency resolution of the time-frequency analysis result.

[0051] For the echo signal s R (t) Establish a linear regular transformation model that ...

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Abstract

The invention provides a method of micro-doppler signal analysis based on combination of linear canonical transform and S-transform. According to the invention, based on echo signal analysis of moving objects performed through the S-transform and linear canonical transform, the optimal time-frequency analysis result frequency resolution is obtained. The method comprises the following steps: a linear regular transformation model of echo signals is constructed; the time-shift characteristic of the echo signals after the linear canonical transform is obtained; an S-transform model of the echo signals is built, and the echo signals after the linear canonical transform is substituted into the S-transform model; based on the time-shift characteristic of the linear canonical transform, the S-transform model is subjected to integration and linear coordinate transformation; a parameter matrix in a linear canonical transform model is obtained; the parameter matrix is adjusted; and the optimal time-frequency analysis result frequency resolution is obtained. The method makes the size of a window function change with the frequency of the analyzed signals, and has a stronger time-frequency analysis function.

Description

technical field [0001] The invention relates to a radar signal processing technology, in particular to a micro-Doppler signal analysis method of linear regular transformation combined with S transformation. Background technique [0002] Potter et al. first proposed a practical time-frequency analysis method based on Fourier transform—short-time Fourier transform (STFT). The basic idea is to assume that the non-stationary signal is stationary within a very short time interval of the analysis window function, and then move the window function along the time axis to calculate the power spectrum at different moments. Later, the short-time Fourier transform theory introduced the concept of self-adaptation, which can select corresponding window functions with different lengths according to different characteristics of the signal. In 1932, physicist E.PWigner proposed the famous Wigner distribution in quantum mechanics, and then Ville introduced it into the field of signal process...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 芮义斌赵若冰李鹏谢仁宏郭山红魏知寒李秀珍严丽萍
Owner NANJING UNIV OF SCI & TECH
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