SAR moving target imaging method based on minimum image entropy

A technology of moving targets and image entropy, applied in the field of remote sensing and radar imaging, which can solve problems such as complex algorithms and many variables to be solved.

Inactive Publication Date: 2020-04-21
PLA NO 63686 CORPS
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Problems solved by technology

This type of method does not make any parametric model assumptions for the phase error of the target signal, and directly estimates the phase error of the target signal through an optimization algorithm. Therefore, there are many variables to be solved and the algorithm is more complicated.

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  • SAR moving target imaging method based on minimum image entropy
  • SAR moving target imaging method based on minimum image entropy
  • SAR moving target imaging method based on minimum image entropy

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art.

[0018] The invention provides a SAR moving target imaging method based on minimum image entropy, which can obtain accurate moving target imaging results while greatly reducing the amount of SAR system data, and provides information for accurate identification of moving targets.

[0019] For the convenience of understanding, the observation model is described in detail first. In this paper, the traditional single-antenna SAR system is considered, and the working mo...

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Abstract

The invention provides an SAR moving target imaging method based on minimum image entropy. The method comprises the following steps: using an RMA algorithm for imaging processing on SAR echo data to obtain an SAR complex image of an observation scene; extracting sub-image data containing a moving target and record the data as ROI data; constructing a compensation function of a phase error, and converting an ROI data self-focusing imaging process into an optimal solution problem with the minimum image entropy as the criterion; and then carrying out search optimization to obtain an imaging processing result with the minimum entropy value, that is, a final moving target imaging result. According to the method, SAR moving target imaging processing can be realized by using a small number of echo data, so that important information is provided for accurate identification of the moving target.

Description

technical field [0001] The invention relates to the technical field of remote sensing and radar imaging, in particular to a SAR moving target imaging method. Background technique [0002] Synthetic Aperture Radar (SAR) can realize all-weather, all-time, high-gain ground stationary target imaging. However, in many military applications, there are not only stationary targets but also some moving targets in the observation scene. Traditional SAR does not have the ability to detect and image moving targets, and moving targets can only be superimposed on stationary target images in the form of defocus. Using SAR system to obtain the results of moving target detection and imaging has become a research hotspot in the military and civilian fields. [0003] Moving target imaging using SAR mainly needs to solve two problems: 1) remove the interference of ground clutter; 2) compensate the phase error caused by target motion. Relatively speaking, the echo signal of the moving target ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9029
Inventor 顾福飞李红艳傅敏辉黄虹伟郭才发王旭良戴正旭
Owner PLA NO 63686 CORPS
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