A Novel Absolute Phase Determination Approach for Low Frequency Ultra-wideband SAR Interferometry
Xu Jun-yi① An Dao-xiang① Huang Xiao-tao① Wang Guang-xue②
①(College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China) ②(Department of Information Countermeasures, Air Force Early Warning Academy, Wuhan 430019, China)
Estimation of topography for the generation of Digital Elevation Models (DEM) requires the absolute interferometric phase. However, the existing absolute phase determination methods are complicated for processing the Ultra-WideBand (UWB) Synthetic Aperture Radar Interferometry (InSAR) data. To resolve this problem, a new approach is proposed in this paper. First, to acquire the high accuracy image registration result, the registration offsets are obtained from the interpolation of the offsets of the control points. Then, based on the offsets, the interferometric phase is computed and divided into two partsthe Registration Phase (RP) and the MisRegistration Phase (MRP). The RP is derived from the registration offsets, and the MRP is dependent on the unknown misregistration. Theoretical derivations show that the MRPs are unambiguous in most high coherence areas, so MRP can be unwrapped efficiently, and its absolute phase can be obtained directly without using any auxiliary data. Finally, the absolute interferometric phase is obtained from adding the RP and the true MRP. Compared with the existing algorithms, the proposed approach has lower complexity. Experimental results on P-band UWB InSAR data prove its effectiveness.
许军毅,安道祥,黄晓涛,王广学. 一种新的低频超宽带干涉合成孔径雷达绝对相位估计方法[J]. 电子与信息学报, 2015, 37(11): 2705-2712.
Xu Jun-yi, An Dao-xiang, Huang Xiao-tao, Wang Guang-xue. A Novel Absolute Phase Determination Approach for Low Frequency Ultra-wideband SAR Interferometry. JEIT, 2015, 37(11): 2705-2712.
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