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Surface Height Change Estimation Method Using Band-Divided Coherence Functions with Fully Polarimetric SAR Images
Ryo OYAMA Shouhei KIDERA Tetsuo KIRIMOTO
IEICE TRANSACTIONS on Communications
Publication Date: 2017/11/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
synthetic aperture radar (SAR), fully polarimetric analysis, coherent change detection (CCD), multiply band-divided SAR images, height change estimation,
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Microwave imaging techniques, in particular, synthetic aperture radar (SAR), are promising tools for terrain surface measurement, irrespective of weather conditions. The coherent change detection (CCD) method is being widely applied to detect surface changes by comparing multiple complex SAR images captured from the same scanning orbit. However, in the case of a general damage assessment after a natural disaster such as an earthquake or mudslide, additional about surface change, such as surface height change, is strongly required. Given this background, the current study proposes a novel height change estimation method using a CCD model based on the Pauli decomposition of fully polarimetric SAR images. The notable feature of this method is that it can offer accurate height change beyond the assumed wavelength, by introducing the frequency band-divided approach, and so is significantly better than InSAR based approaches. Experiments in an anechoic chamber on a 1/100 scaled model of the X-band SAR system, show that our proposed method outputs more accurate height change estimates than a similar method that uses single polarimetric data, even if the height change amount is over the assumed wavelength.