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High-resolution Spaceborne SAR Imaging Error Estimation and Compensation Method

An imaging error and compensation method technology, applied in the intersection of aerospace and microwave remote sensing, can solve the problems of space-variable defocusing, tropospheric delay error, etc., to achieve image quality improvement, reduce disturbance tropospheric delay error, and improve imaging quality. Effect

Active Publication Date: 2020-11-24
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The purpose of the present invention is: to propose a high-resolution spaceborne SAR imaging error estimation and compensation method, aiming at the disturbance tropospheric delay error, to solve the introduced space variable defocusing problem

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  • High-resolution Spaceborne SAR Imaging Error Estimation and Compensation Method
  • High-resolution Spaceborne SAR Imaging Error Estimation and Compensation Method
  • High-resolution Spaceborne SAR Imaging Error Estimation and Compensation Method

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] figure 1 It is a processing schematic diagram and flow chart of the high-resolution spaceborne SAR imaging error estimation and compensation method provided by the present invention, and the whole process is divided into six steps. For the obtained high-resolution spaceborne SAR image, the first step: azimuth decompression and deskewing processing; the second step: dividing sub-bands and sub-blocks; the third step: sub-block MDA processing; the fourth step: azimuth processing ; The fifth step: range processing; the sixth step: error phase compensation and azimuth refocus processing. Finally, the precisely focused SAR image after the compensation of the disturbance tropospheric delay error is obtained, Figure 5 The above steps are also shown. The detailed description is as follows:

[0021] The parameters of the known high-resolution spaceborne SAR system ar...

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Abstract

The invention provides a high-resolution spaceborne SAR imaging error estimation and compensation method aimed at a troposphere disturbing delay error. An obtained high-definition spaceborne SAR image is decompressed in the azimuth to obtain azimuth decompression data; deramping is carried out to obtain deramped azimuth decompression data; the data is divided into sub-band along the distance direction, and then divided to sub-blocks along the azimuth; an MDA algorithm is used to estimate an azimuth frequency modulated inclination error introduced for the troposphere disturbance delay error in each sub-block, and the troposphere disturbing delay error is estimated; the troposphere disturbing delay error is used to compensate the azimuth decompression data; and a result is re-focused in the azimuth to obtain an accurately focused high-definition spaceborne SAR image. The method of the invention can be widely applied to improve the quality of the high-definition SAR image and random error estimation and compensation.

Description

technical field [0001] The invention belongs to the cross-technical field of the combination of aerospace and microwave remote sensing, and in particular relates to a method for estimating and compensating delay errors of disturbance troposphere in high-resolution spaceborne SAR (Synthetic Aperture Radar, synthetic aperture radar) imaging. Background technique [0002] The spaceborne SAR system is an active radar detection and imaging system, which can observe and image ground targets all-weather and all-weather, and is widely used in land surveying and mapping, ocean surveying and mapping, natural disaster detection, agricultural observation, global carbon and water cycle observation , military reconnaissance and other aspects, it is one of the important sensors in the field of remote sensing [1] . [0003] However, with the proposal and development of high-resolution spaceborne SAR systems, the impact of disturbance delay errors introduced by tropospheric propagation in t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40
Inventor 李德鑫董臻粟毅张永胜何志华余安喜何峰孙造宇金光虎张启雷
Owner NAT UNIV OF DEFENSE TECH
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