Amplitude and Phase Statistics of Multi-look SAR Complex Interferogram

Yu Anxi; Wei Haijun; Dong Zhen; Huang Haifeng

doi:10.14429/dsj.64.4747

Yu Anxi National University of Defense Technology, Changsha
Wei Haijun Naval Equipment Technology Institute, Beijing
Dong Zhen National University of Defense Technology, Changsha
Huang Haifeng National University of Defense Technology, Changsha

DOI: https://doi.org/10.14429/dsj.64.4747

Keywords: Synthetic aperture radar, complex interferogram, amplitude and phase statistics, probability density functions

Abstract

Amplitude and phase statistics of SAR complex interferogram are significant in the study of interferometry and polarimetry. To reduce statistical variations, multi-look processing is adopted by averaging spatially the complex interferogram. In this study, we derive and validate three kinds of probability density functions (PDFs) of multi-look interferogram for different surface feature scenes. For simple homogeneous areas with the gamma distribution intensity, a concise product-form interferometry phase PDF is derived, which is equivalent to a conventional Gauss hypergeometric PDF. For complicated areas with the K and G0 distributions intensity, two new interferometry amplitude PDFs named as Gamma-K and Gamma-G are proposed, and their phase PDFs are approximately preserved. Finally three typical areas including grass, mountain, and city are picked out from a pair of RADARSAT-2 SAR images and studied. Experimental results indicate good agreement between the computed histograms and the theoretical distributions. The results obtained can be applied to the feature classification of polarisation SAR data and the estimation of decorrelation effect of interferometric SAR.

Science Journal, Vol. 64, No. 6, November 2014, pp.564-570, DOI:http://dx.doi.org/10.14429/dsj.64.4747

Author Biographies

Yu Anxi, National University of Defense Technology, Changsha

Dr Yu Anxi received PhD from National University of Defense Technology in 2003. He is currently an Associate Professor with the College of Electronic Science and Engineering, National University of Defense Technology. His current research interests include SAR geocoding, interferometry SAR and differential interferometry SAR.

Wei Haijun, Naval Equipment Technology Institute, Beijing

Dr Wei Haijun received PhD from National University of Defense Technology in 2011. He is currently an engineer with the Naval Equipment Technology Institute. His current research interests include interferometry SAR and equipment fault diagnosis.

Dong Zhen, National University of Defense Technology, Changsha

Dr Dong Zhen received the PhD from National University of Defense Technology in 2001. He is currently a Professor with the College of Electronic Science and Engineering, National University of Defense Technology. His recent research interests include SAR system design and processing, interferometry SAR, and digital beamforming.

Huang Haifeng, National University of Defense Technology, Changsha

Dr Huang Haifeng received the PhD from National University of Defense Technology in 2005. He is currently an Associate Professor with the College of Electronic Science and Engineering, National University of Defense Technology. His current research interests include SAR system design and processing, interferometry SAR.

Amplitude and Phase Statistics of Multi-look SAR Complex Interferogram

Abstract

Author Biographies

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