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Distance extension target detection method on basis of matched fuzzy function

A technology of distance expansion target and ambiguity function, which is applied in the direction of radio wave measurement system, instrument, etc., and can solve the problem of no high-speed rotation

Active Publication Date: 2014-12-24
XIDIAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, this situation is only suitable for low-speed, and no high-speed rotating target

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  • Distance extension target detection method on basis of matched fuzzy function
  • Distance extension target detection method on basis of matched fuzzy function
  • Distance extension target detection method on basis of matched fuzzy function

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Experimental program
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Embodiment Construction

[0043] The present invention will be further explained below in conjunction with the drawings:

[0044] Reference figure 1 , Is a flowchart of the method for detecting a distance extended target based on a matching ambiguity function of the present invention. The method for detecting a distance extended target based on a matching ambiguity function includes the following steps:

[0045] Step 1. Use radar to transmit signal, use radar to receive and receive echo signal, then mix the echo signal and reference signal to obtain the mixed signal r, and estimate the noise standard deviation of the mixer signal r

[0046] The specific sub-steps are:

[0047] Use broadband radar to transmit signal (wideband chirp signal), broadband radar receiver receives the echo signal (echo of broadband chirp signal reflected by the target), and then de-skewing the echo signal to achieve signal down conversion , The process of skew processing is: mixing the echo signal and the reference signal to obtain ...

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Abstract

The invention belongs to the technical field of radar target detection and particularly relates to a distance extension target detection method on the basis of matched fuzzy function. The distance extension target detection method includes steps of mixing echo signals and reference signals to obtain mixed signals, and estimating noise standard deviations of signals of a mixer; acquiring standardized signals of the mixed signals; subjecting the standardized signals of the mixed signals to discrete Fourier transform to obtain frequency domain signals after the discrete Fourier transform; dividing the frequency domain signals after the discrete Fourier transform into N / L sub-frequency domain signals by a function of a rectangular window; taking module values of various frequency values within each sub-frequency domain signals and summing the module values to obtain sequence imax of the N / L sub-frequency domain signals with the largest sum of the module values of the frequency values in the sub-frequency domain signals, and structuring matching signals; acquiring mutual fuzzy functions of the matching signals and the mixed signals to obtain regional integral characteristic values P; setting detection threshold eta, if the P is larger than or equal to the eta, indicating that targets exist, and if the P is smaller than the eta, indicating that the targets do not exist.

Description

Technical field [0001] The invention belongs to the technical field of radar target detection, and in particular relates to a range expansion target detection method based on a matching ambiguity function. Background technique [0002] The target's echo signal is related to two radar constants: the wavelength of the transmitted signal and the range resolution. If the size of the target along the line of sight of the radar is greater than the wavelength of the radar emission wave, the target can be seen as a combination of a series of scattered physical reflection centers, and the echo signal can be seen as a superposition of echoes reflected by multiple separate scattering centers . [0003] In recent years, high-resolution radar has made significant progress and has been widely used in imaging. In a high-resolution radar system, the range resolution is smaller than the size of the target in the radar's line of sight. Therefore, the scattering centers are distributed in differen...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 李明曹润清左磊吴艳薄涛
Owner XIDIAN UNIV