ACTA AERONAUTICAET ASTRONAUTICA SINICA >
SAR image registration algorithm based on echo information of overlapping subaperture
Received date: 2022-04-07
Revised date: 2022-04-25
Accepted date: 2022-07-04
Online published: 2022-07-21
Supported by
Aeronautical Science Foundation of China(20182052013)
Synthetic Aperture Radar （SAR） image registration is the process of finding the geometric transformation relationship between multiple SAR images to calibrate different images to a unified spatial coordinate system. When traditional optical image registration methods， such as Scale-Invariant Feature Transform （SIFT） combined with Random Sample Consensus （RANSAC） algorithm， are used for SAR image registration， the registration performance is greatly affected by the interference of multiplicative speckle noise. In this paper， a SAR image registration algorithm is proposed based on the echo information of overlapping subaperture. In the imaging processing of the complex echo data， using the phase information and the subaperture autofocusing algorithm， highly correlated overlapping subaperture images are obtained. The multiimage registration methods are used to achieve the subaperture image registration within and between imaging apertures， so as to improve the accuracy of SAR image registration. The processing results of the measured data of several different scenes show that the proposed algorithm has more homonymous points， fewer mismatched point pairs， and smaller root mean square error than the SIFT + RANSAC algorithm. Moreover， the proposed algorithm is more robust to speckle noise， and thereby gains the improved registration performance.
Zheng YE , Daiyin ZHU , Di WU . SAR image registration algorithm based on echo information of overlapping subaperture[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(8) : 327254 -327254 . DOI: 10.7527/S1000-6893.2022.27254
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