A Design Method of mtd Filter Bank Based on Second-Order Cone Optimization Theory

Abstract

The invention belongs to the field of signal processing, and discloses an MTD filter bank design method based on second-order cone optimization theory, including: initializing the basic parameters of the filter; searching for parameters, calculating the covariance matrix of ground clutter; obtaining the frequency of interference signals and power and calculate the covariance matrix of interference: obtain the noise power of the radar and calculate the covariance matrix of ground clutter, interference and noise; use a method similar to the minimum variance undistorted response to linearly constrain the filter center frequency; in Under the condition of restricting the side lobe level of the filter's amplitude-frequency response, modify the above linear constraint conditions; transform it into an easy-to-solve second-order cone programming real number problem; design an MTD filter based on the second-order cone programming theory, by limiting the side lobe The lobe level can freely form a deeper notch in the strong interference frequency area or meteorological clutter area, which overcomes the problem of filter distortion near zero frequency and enhances the advantages of low-speed moving target detection.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to an MTD (Moving Target Detection) filter bank design method based on the second-order cone optimization theory, which is used for radar to suppress clutter and realize radar detection of targets Background technique [0002] Effective suppression of clutter signals is the premise and foundation of normal target detection for radar systems. Among the adaptive clutter suppression methods, moving target detection MTD is a commonly used technique. The moving target detection MTD filter uses a filter bank composed of multiple band-pass filters to filter the radar echo, and then detects the output of the filter bank to find the target. [0003] 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 display MTI processing is added before the discrete Fourier transform DFT f...

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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a MTD filter bank design method based on the second-order cone optimization theory, to solve the serious performance degradation of the moving target detection MTD filter in the prior art when the center frequency is close to zero frequency , the problem of filter distortion, and the problem that the windowing method cannot make the filter form a wide notch in a specific frequency band such as meteorological clutter or strong interference

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