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Design Method of Variable Notch Width MTD Filter Based on Prior Information

A technology of filter design and prior information, applied in the field of signal processing, can solve the problem of fixed notch width and achieve the effect of reducing filtering loss

Active Publication Date: 2018-08-21
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, propose a kind of variable notch width moving target detection MTD filter design method based on prior information, to solve the problems in the moving target detection MTD filter in the above-mentioned method The notch width of each finite-long-impulse-response FIR filter near its zero frequency is a fixed problem of

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  • Design Method of Variable Notch Width MTD Filter Based on Prior Information
  • Design Method of Variable Notch Width MTD Filter Based on Prior Information
  • Design Method of Variable Notch Width MTD Filter Based on Prior Information

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Embodiment Construction

[0050] The steps of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0051] refer to figure 1 , The specific implementation steps of the present invention are as follows.

[0052] Step 1, look up parameters.

[0053] By looking up the ground clutter power spectrum variance and ground clutter power table in different scenarios, the power spectrum variance and ground clutter power of the radar working scene are obtained.

[0054] The example of the present invention adopts the air-to-air intelligence radar, and the equidistant line array is shared by sending and receiving. σ c 2 Indicates that the ground clutter power of the radar working scene obtained by searching is expressed by δ c 2 express.

[0055] Step 2, obtain the covariance matrix of the ground clutter.

[0056] According to the following Gaussian power spectral density formula, calculate the clutter power spectral density of the radar working sce...

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Abstract

The invention discloses a design method for a recess width variable MTD filter based on prior information. The method comprises the steps of 1) searching parameters; 2) obtaining a covariance matrix of ground clutters; 3) obtaining initialized interference signal power; 4) designing an FIR filter of a digit integrated method; 5) searching a power spectrum variance of the ground clutters; 6) obtaining an FIR filter of an optimal clutter improvement factor; and 7) designing the recess width variable MTD filter. According to the invention, the prior information of a radar surrounding scene is obtained, so that the clutter improvement factor of the output end of the filter is kept optimal. The problem that the recess width in the zero frequency position of the MTD filter is fixed in the prior art is solved. The MTD filter designed in the method has different expected recess widths for different central frequencies, and detection for low-speed movement objects is enhanced.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and further relates to a design method of an MTD (Moving Target Detection) filter with variable notch width based on prior information in the technical field of clutter suppression. The invention can be used for the radar to suppress the clutter and realize the detection of the target. Background technique [0002] Effective suppression of clutter signals is the premise and basis for normal target detection in radar systems. In the adaptive clutter suppression method, moving target detection MTD (Moving Target Detection) is a commonly used technology. The moving target detection MTD filter uses a filter bank composed of multiple bandpass filters to filter the radar echo, and then detects the output of the filter bank to find the target. The easiest way to realize the moving target detection MTD filter bank is to use the discrete Fourier transform DFT filter bank. The moving target di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36G01S7/41
CPCG01S7/36G01S7/414
Inventor 赵永波孙林程增飞刘宏伟何学辉苏洪涛
Owner XIDIAN UNIV
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