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A Method of Geometric Correction of SAR Image Using Software Cache Technology

A geometric correction and software technology, applied in the field of SAR imaging, can solve problems such as low efficiency

Active Publication Date: 2021-05-07
北京理工雷科电子信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of inefficiency when accessing external memory frequently and with a small amount of data in the geometric correction process, the present invention proposes a method for using software cache technology for geometric correction of SAR images

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  • A Method of Geometric Correction of SAR Image Using Software Cache Technology
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  • A Method of Geometric Correction of SAR Image Using Software Cache Technology

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Embodiment

[0049] The invention is designed to realize software cache under PC environment, and evaluate its efficiency. Table 1 describes the parameters of the test environment. The fast device in the table is the actual location of the software cache, and the slow device is the external memory, which is the storage location of the image before and after correction.

[0050] Table 1 Basic information of the test platform

[0051]

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Abstract

The present invention proposes a method for using software cache technology for geometric correction of SAR images. The specific steps are: in the processor memory, a section of free area is used as a software cache area, and uncorrected SAR images are stored in multiple blocks. The addresses of the data stored in each block are continuous; according to the geometric correction law, determine the corresponding relationship between each pixel of the SAR image before correction and the corrected image of a predetermined blank; step 3, along the oblique line in the direction of the antenna azimuth angle Traverse the pixels on the blank corrected image, use the cache mechanism to extract pixel values ​​and fill them in the blank corrected image until all the pixels on the blank uncorrected image have been traversed. The invention breaks through the bottleneck caused by the low efficiency of the processor accessing the external memory, and improves the data interaction efficiency.

Description

technical field [0001] The invention relates to a method for using software cache technology for SAR image geometry correction, belonging to the technical field of SAR imaging. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution imaging radar, which overcomes the shortcomings of optical imaging affected by weather and day and night, and has the ability to work all day and all weather. However, compared with the real geographic graphics, the SAR image generated after two-dimensional pulse pressure has certain geometric deformation. Geometric correction is the process of eliminating geometric deformation of SAR images, and finally obtains SAR images consistent with the real geographical environment. [0003] Geometry correction is a computation-intensive process, characterized by a large amount of computation and high frequency of memory access. Several existing literatures try to solve the efficiency problem of geometric correction from the per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T2207/10044G06T5/80
Inventor 刘峰高立宁刘腾飞
Owner 北京理工雷科电子信息技术有限公司