Advanced ESD coregistration of inteferometric processing for Sentinel-1 TOPS data

doi:10.11947/j.AGCS.2020.20180578

Abstract

Abstract: The TOPS mode images of Sentinel-1 satellite usually use the overlapping regions between bursts to achieve high-precision coregistration by using enhanced spectral diversity (ESD) technique after carrying out geometric coregistration. The geometric coregistration relies on the use of satellite orbit parameters which limiting the registration accuracy. Consequently, the key of sentinel-1 image registration is to accurately estimate the residual offset after geometric registration through enhanced spectral diversity. However, the ESD suffers from incoherent noise making it difficult to meet the requirement of 0.001 of the pixels spacing. In this study, we first improve the ESD performance for single interferometric pair in following aspects: ①develop ESD multi-looking theory, optimized the ESD workflow by using early-multi-looking process; ②apply weighted periodogram to improve the parameter estimation on the basis of the residual offset equal weight observations of ESD phase; ③propose the ESD weighted estimation that exploits range overlapping areas, and an increased number of overlapping areas contribute to the estimated accuracy. On this basis of single-baseline co-registration, we proposed the optimized solutions for time-series image processing: ①use the redundant ESD observations from interferometric pairs to conduct multi-baseline coregistration; ②improve the interferogram quality by distributed scatterers technique so that increase the accuracy of the ESD estimation. The above improvement schemes are mutually complemental and can also be implemented independently. The experiment results show that the above improvement methods can improve the registration accuracy.

Key words: Sentinel-1A/B, enhanced spectral diversity, periodogram, distributed scatterers, early-multilooking, late-multilooking

CLC Number:

P237

WU Wenhao, ZHANG Lei, ZHANG Tengxu, WANG Mingzhou, LONG Sichun, DUAN Meng, ZHOU Zhiwei, ZHU Chuanguang. Advanced ESD coregistration of inteferometric processing for Sentinel-1 TOPS data[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(11): 1451-1462.

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