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Maximum posterior probability-based super-resolution method of airborne foresight sea surface target angle

A technology of maximum a posteriori probability and target angle, applied in radio wave measurement systems, instruments, etc., can solve the problems of lack of target prior information, easy to appear false targets, poor clutter suppression effect, etc., and achieve low computational complexity, The effect of strong imaging adaptability and enhanced adaptability

Inactive Publication Date: 2018-09-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, due to the lack of prior information of the target, the method has a poor effect on clutter suppression, and false targets are prone to appear in the case of low signal-to-clutter ratio.

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  • Maximum posterior probability-based super-resolution method of airborne foresight sea surface target angle
  • Maximum posterior probability-based super-resolution method of airborne foresight sea surface target angle
  • Maximum posterior probability-based super-resolution method of airborne foresight sea surface target angle

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Embodiment Construction

[0045] The present invention mainly uses simulation experiments to demonstrate the feasibility and effectiveness of the proposed radar angle super-resolution method. In the present invention, all steps, conclusion are verified correctly on the Matlab2015 simulation platform, below in conjunction with accompanying drawing and specific implementation steps, the present invention is further elaborated.

[0046] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0047] see figure 1 , the present invention provides an airborne forward-looking sea surface target angle super-resolution method based on maximum a posteriori probability, which is realized through the following process:

[0048]Step 1, initialize the airborne scanning radar parameters.

[0049] In this example, according to figure 2 The geometric model of the forward-looking imaging of the airborne scanning radar is shown, and according to the system ...

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Abstract

The invention provides a maximum posterior probability-based super resolution method of an airborne foresight sea surface target angle, belonging to the field of radar imaging and signal processing. According to the method, a traditional range high resolution technology is used on the basis of establishing a radar echo signal two-dimensional convolution model, namely high resolution of radar echorange is realized by pulse compression and range migration correction technology; in the azimuth, radar angle super-resolution imaging is realized by adopting a sea-surface target retrieval method. According to the statistic distribution characteristic of sea-surface clutter, the sea-surface clutter distribution is represented by adopting rayleigh distribution, and the sea-surface distribution characteristic is expressed by utilizing distribution which has an adjustable characteristic based on generalized gaussian distribution, and the MAP iterative solution is exported under the Bayesian framework to realize sea-surface target angle super-resolution. The method has the advantages of low calculation complexity, strong imaging adaptability under complicated sea state and different target scenes.

Description

technical field [0001] The invention belongs to the field of radar imaging and signal processing, in particular to an airborne forward-looking sea surface target angle super-resolution method based on maximum a posteriori probability. Background technique [0002] The high-resolution imaging of forward-looking sea targets by airborne radar has important application value in the fields of maritime rescue, maritime early warning, and ship navigation in severe weather. For the traditional synthetic aperture radar (SAR) technology and Doppler beam sharpening (DBS) method, due to the limitation of the working mechanism, it is impossible to achieve angular high-resolution imaging in the forward-looking area. At present, the radar imaging of the forward-looking area on the sea mostly adopts the method of airborne scanning radar, and its high resolution in the range direction is realized by pulse compression and range migration correction technology; however, the resolution in the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 黄钰林李昌林王茹斐张永伟张永超张寅杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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