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Sea clutter suppression and target detection method

A technology for target detection and sea clutter, used in radio wave measurement systems, measurement devices, reflection/re-radiation of radio waves, etc.

Active Publication Date: 2021-01-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0004]In order to solve the traditional sea clutter suppression method based on tunable Q factor wavelet transform (TQWT) to key parameter combination (Q, r, J) or dependent on the target prior information, or rely on a large number of experiments, the present invention proposes a sea clutter suppression and target detection method based on adaptive adjustable Q factor wavelet transform (A-TQWT)

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  • Sea clutter suppression and target detection method

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[0045] The effectiveness of the present invention will be described below in conjunction with the accompanying drawings and simulation examples.

[0046] According to the sea clutter suppression and target detection model of the present invention, the weak moving target of simulation is added on the basis of measured sea clutter data, and Matlab (a kind of computer algorithm language) is used to carry out simulation verification, and concrete simulation parameters and sea clutter The information of the clutter measured data is as follows:

[0047] Sea clutter measured data information: The data is measured by X-band fully coherent radar. The radar operating frequency is 9.39GHz, the pulse width is 200ns, the pulse repetition frequency is 1000Hz, and the number of pulses is 131072. The data file contains the echo signals of 14 range gates; the range resolution of the radar is 30m when measuring this set of data, and the main sea environment condition is that the wave height is ...

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Abstract

The invention belongs to the field of sea clutter suppression and target detection, and relates to a sea clutter suppression and target detection method based on adaptive adjustable Q factor wavelet transform. On the basis of deep analysis of sea clutter characteristics and target echo characteristics, evaluation indexes are designed in advance according to oscillation characteristic differences of sea surface targets and sea clutters, TQWT key parameter combinations (Qopt, ropt, Jopt) capable of being better matched with target characteristics are obtained through self-adaptive constraint, sea surface echo signals are analyzed through adopting a morphological component analysis (MCA) method to obtain the optimal sparse representation of the target, and selecting an appropriate threshold to determine a reconstructed wavelet coefficient set for reconstruction according to the proportion of each wavelet sub-band of a target component in the total energy so as to obtain a reconstructed signal of the target. Therefore, the target and the sea clutter can be effectively separated, and the purposes of sea clutter suppression and target detection can be achieved.

Description

technical field [0001] The invention belongs to the field of sea clutter suppression and target detection, and relates to a method for sea clutter suppression and target detection based on adaptive adjustable Q factor wavelet transform. Background technique [0002] Tunable Q-factor wavelet transform (Tunable Q-factor wavelet transform, TQWT) is a discrete-time wavelet transform with tunable Q factor, which is parameterized by ternary parameter combination (Q, r, J), where Q stands for quality factor, which reflects the duration of wavelet oscillation; r stands for redundancy, which refers to the total oversampling rate of all subbands of wavelet transform when the number of decomposition layers J is infinite; divide the total number of wavelet coefficients by the length of the signal for TQWT To calculate, J represents the number of decomposition layers; J layer decomposition produces J+1 wavelet sub-bands in total, including J high-pass sub-bands and 1 low-pass sub-band. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S13/58G01S7/41G01S7/02
CPCG01S13/88G01S13/58G01S7/418G01S7/41G01S7/023Y02A90/10
Inventor 宗竹林冯云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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