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Method for realizing angular super-resolution imaging of forward-looking sea surface targets in sea clutter background

A technology of super-resolution imaging and target angle, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as target dislocation and noise amplification

Active Publication Date: 2015-09-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of target dislocation and noise amplification in the existing airborne forward-looking sea surface target angle super-resolution imaging technology, and propose a forward-looking sea surface target angle super-resolution imaging method under the background of sea clutter

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  • Method for realizing angular super-resolution imaging of forward-looking sea surface targets in sea clutter background
  • Method for realizing angular super-resolution imaging of forward-looking sea surface targets in sea clutter background
  • Method for realizing angular super-resolution imaging of forward-looking sea surface targets in sea clutter background

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Embodiment Construction

[0088] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0089] For the convenience of describing the content of the present invention, the following terms are first explained:

[0090] (1) Radar angle super-resolution

[0091] Radar angular super-resolution means that the radar breaks through the inherent resolution limit of the imaging system and achieves high resolution in azimuth through the method of signal processing.

[0092] (2) Real beam scanning radar

[0093] Real beam scanning radar is a radar that transmits the antenna beam by mechanical rotation, so that the beam scans the scene target uniformly or non-uniformly in azimuth.

[0094] (3) Sea clutter

[0095] In the radar field, the echo signal reflected from the sea surface is called sea clutter, which is determined by the wave, wind speed, the direction and duration of the wave relative to the radar beam, the appearance of wave crests, low t...

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Abstract

The invention discloses a method for realizing angular super-resolution imaging of forward-looking sea surface targets in a sea clutter background. According to the convolution characteristic of azimuth dimension echoes of scanning radar, echo signals of the scanning radar are rearranged into a form of the product of an azimuth dimension target vector and a convolution measurement matrix in the distance dimension order. Then a maximum posterior target function for solving original scene distribution is constructed on the basis of the Bayes formula according to characteristics that sea clutter obeys Rayleigh distribution and the sea surface targets obey Laplace, original sea surface target distribution is inverted by the aid of an acquired maximum posterior deconstruction iterative equation, and angular super-resolution imaging is realized. According to the method, the Rayleigh distribution is used for representing sea clutter characteristics, the Laplace distribution is used for representing the target characteristics, an iteration expression of the convolution inversion problem is derived in the Bayes principle, reconstruction of original imaging scenes is realized, and azimuth high-definition pictures of the forward-looking sea surface targets are acquired.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, in particular to the design of a forward-looking sea surface target angle super-resolution imaging method under the background of sea clutter. Background technique [0002] The high-resolution imaging of the forward-looking sea area of ​​the airborne platform has huge application requirements in the fields of sea detection and imaging, sea surface target search and rescue, ship formation identification, and ship attack. However, due to the narrow Doppler bandwidth caused by the movement of the target and the airborne platform in the forward-looking area, it is impossible to use synthetic aperture radar (SAR) and Doppler beam sharpening (DBS) to achieve high target azimuth in the forward-looking area. Resolution imaging. Therefore, the airborne radar usually obtains the real beam echo signal in the forward-looking area by means of scanning sampling. Since the radar transmit signal is a lin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89
CPCG01S7/414G01S13/89
Inventor 张寅王月黄钰林查月波杨建宇武俊杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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