Research on permanent scatterer extraction methods in differential SAR tomography

Bihui Cheng; Hui Liu; Ziye Guo; Yuxi Jiang; Xinyu Guo; Shuaihua Tian

doi:10.1117/12.2611675

15 February 2022 Research on permanent scatterer extraction methods in differential SAR tomography

Bihui Cheng, Hui Liu, Ziye Guo, Yuxi Jiang, Xinyu Guo, Shuaihua Tian

Proceedings Volume 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021); 121661F (2022) https://doi.org/10.1117/12.2611675
Event: Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 2021, Hong Kong, Hong Kong

Abstract

Differential Tomography SAR (D-TomoSAR) is a significant technology for large-scale land subsidence monitoring, which can be utilized to obtain deformation information. In particular, it owns unique technical advantages, such as high deformation sensitivity and accuracy. D-TomoSAR allows resolving layovers by handle the situation where multiple scatterers exist within a range-azimuth resolution cell. However, the extraction of scatterers is a critical and challenging issue. As we all know, there are four main parameters for a PS in SAR images. They are namely amplitude, phase, coherence and signal-to-clutter ratio (SCR). In this paper, the characteristic of the four parameters is analyzed firstly. Then, according to the characteristic of the four parameters, three different methods of PS extraction are studied theoretically, which are amplitude dispersion (AD) threshold method, coherence coefficient (CC) threshold method and SCR threshold method in temporal and spatial domain. Finally, the SAR data from TerraSAR-X satellite are used for experimental at North Star Times Tower in Beijing, China. The extraction results of the three approaches are compared. The experimental results show that AD and SCR methods are more reliable than CC method. It is due to that CC approach is affected by the neighborhood pixels to a large extent. Additionally, SCR method is more time saving than AD and CC methods. Therefore, we can conclude that SCR approach is suitable for engineering application.

Citation Download Citation

Bihui Cheng, Hui Liu, Ziye Guo, Yuxi Jiang, Xinyu Guo, and Shuaihua Tian "Research on permanent scatterer extraction methods in differential SAR tomography", Proc. SPIE 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 121661F (15 February 2022); https://doi.org/10.1117/12.2611675

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KEYWORDS

Synthetic aperture radar

Tomography

Signal to noise ratio

Buildings

Scattering

Coherence (optics)

Interferometric synthetic aperture radar

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