Coherence analysis of high resolution SAR sub-aperture image and its application in ground feature classification

doi:10.7523/j.ucas.2021.0052

Abstract

Abstract: With the continuous improvement of synthetic aperture radar (SAR) resolution, the transmitted signal bandwidth and synthetic aperture are continuously increasing, which provide more options for subsequent applications. How to develop the potential of high resolution SAR with large synthetic aperture and large signal bandwidth in the application of ground feature classification and interference is worth studying. Coherence, the feature most commonly used in SAR image analysis, is analyzed in this paper. Firstly, the coherence coefficients between the sub-apertures, sub-bands, and repeat-pass interferometric sub-apertures of typical targets, such as man-made targets and natural features, are analyzed theoretically. Then, the above coherence coefficients are calculated using the real data of high-resolution spaceborne SAR to verify the correctness of the analysis. And then, unsupervised feature classifications are performed according to different features of different ground objects in different coherence coefficients, and the features represented by different categories were given. The analysis results in this paper provide support for the optimization application of high-resolution SAR data, and deepen the understanding of the characteristics of different SAR targets.

Key words: high resolution SAR, coherence, sub-apterture, imaging processing bandwidth, image classification

CLC Number:

TN957.52

XING Wenji, JIN Yan, QIU Xiaolan, DING Chibiao, ZHOU Xiao. Coherence analysis of high resolution SAR sub-aperture image and its application in ground feature classification[J]. Journal of University of Chinese Academy of Sciences, 2022, 39(6): 764-775.

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