Method for applying software cache technology to geometric correction of SAR images

Abstract

The invention discloses a method for applying a software cache technology to geometric correction of SAR images. The method specifically comprises the following steps of: in a processor memory, takingan idle area as a software cache area, and storing uncorrected SAR images in a plurality of blocks, wherein addresses of data stored in the blocks are continuous; determining a corresponding relationship between the uncorrected SAR images and each pixel of pre-given blank corrected images according to a geometric correction rule; and traversing the pixel points on the blank corrected images alongan inclined line in an antenna azimuth angle direction, extracting pixel values via a cache mechanism and filling the pixel values into the blank corrected images until the pixel points on all the blank uncorrected images are traversed. The method has the advantages of breaking through the bottleneck caused by low efficiency of accessing external memories by processors, and improving 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...

AI Technical Summary

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 geome

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