Height Reconstruction Using Multifrequency InSAR Data

Synthetic Aperture Radar interferometric (InSAR) is a new radar imaging technique developed from SAR. Carried forward the merit of SAR, it can provide accurate digital three-dimensional topographic measurement in all weather conditions day and night. Because of the wide and latent applications of InSAR in many areas like military, civil and scientific researches, InSAR is one of the most active fields in remote sensing nowadays. With the emerging of multi-frequency InSAR system, extraction of 3-D and variation information of earth surface using multi-frequency InSAR data has drawn more attention.In this dissertation, height reconstruction algorithm using multi-frequency InSAR data is systematically studied, and a more reasonable procedure for realizing the multi-frequency InSAR imaging is proposed.First, this dissertation provides an overview of principle of InSAR imaging, composition of signal processing procedure, and some factors that affect the DEM reversion. Then, a more detailed discussion on main steps of multi-frequency InSAR data processing, including some classical height reconstruction algorithm using multi-frequency InSAR data, is given. Due to the demerit of the algorithm, we present a new multi-frequency Maximum likelihood estimation (MLE) method based on traditional phase unwrapping method. The experiment results using the simulated and real data are given, and the comparation and analysis of them are also presented. Special stresss is laid on the precision of final DEM. The result of simulated data shows that the imaging flow is very universal and accurate.Finally, our whole work is summarized, and personal opinions about this study field are given. Reconstruction...