Algorithm of generating DEM in real-time for airborne dual-antenna InSAR system and its realization

doi:10.7523/j.issn.2095-6134.2014.05.014

Abstract

Abstract:

In order to meet the requirement of terrain mapping in real time, we solve the problem of large computation in algorithm and provide real-time DEM generating algorithm based on airborne dual-antenna InSAR system. The algorithm utilizes non-linear ECS auto-registration imaging algorithm to generate high-accuracy registrated dual-channel SAR images, and omits the sabsequent time-consuming registration course. Fast filter is performed on the two SAR images to generate high-quality interferometric fringe, and then fast phase unwrapping algorithm based on partitioning the dense residues area is done to get the unwrapped phase. For the traditional time-consuming calibration problem, estimation of initial phase deviation in real time based on external coarse precision DEM data is performed. By combining the parameters such as baseline length, baseline obliquity, and absolute time delay, DEM is generated in real time. Through analyzing the real-time performance of the algorithm, the hardware structure to realize the algorithm is brought forward. The processed results of the real InSAR data show the validation of the algorithm.

Key words: InSAR, auto-registration, phase unwrapping, initial phase offset, real-time DEM

CLC Number:

TN959.3

CHEN Lifu, LIN Yueguan, PENG Shurong, LI Hongying. Algorithm of generating DEM in real-time for airborne dual-antenna InSAR system and its realization[J]. , 2014, 31(5): 678-684.

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