MTD filter bank design method based on second-order cone optimization theory

Abstract

The invention belongs to the field of signal processing, and discloses a MTD filter bank design method based on second-order cone optimization theory, which comprises: initializing basic parameters ofa filter; searching parameters, and calculating a covariance matrix of earth clutter; obtaining an interference signal frequency and power and calculating a covariance matrix of interference: obtaining radar noise power and calculating coherence matrixes of ground clutter, interference and noise; using a method similar to the minimum variance undistorted response to linearly constrain the filtercenter frequency; under the condition that the amplitude-frequency response sidelobe level of the filter is limited, modifying the condition of the above linear constraint; and transforming into a second-order cone programming real number problem that is easy to solve. The MTD filter based on the second-order cone programming theory is designed, by limiting the sidelobe level, a deeper notch in the strong interference frequency region or the meteorological clutter region is freely formed, the problem that the filter is distorted near zero frequency is solved, and the advantages of low-speed moving target detection are enhanced.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a design method of an MTD (Moving Target Detection) filter bank based on second-order cone optimization theory, which is used for the suppression of clutter by radar and realizes the detection of targets by radar Background technique [0002] Effective suppression of clutter signals is the premise and basis for normal target detection in radar systems. Among 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 bandpass 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 tran...

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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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