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Analysis and Simulation of Errors in Distributed InSAR
Author: ZuoYingZhi
Tutor: ZhaoShuQing
School: Harbin Institute of Technology
Course: Signal and Information Processing
Keywords: Interferometric Synthetic Aperture Radar(InSAR) system simulation baseline time synchronization
CLC: TN958
Type: Master's thesis
Year: 2009
Downloads: 31
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Abstract
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Distributed Interferometric Synthetic Aperture Radar (InSAR) system can overcome the time decorrelation between interfeometric signals, and improve the height measurement sensitivity owing to long baseline. As a result more precise digital elevation model(DEM) can be acquired. The influence of errors in distributed InSAR is analyzed in the paper.Some important parameter of InSAR-the baseline is explored in depth, and the formulation of the critical baseline of distributed InSAR is obtained. Then the impact of the baseline on correlation coefficient and measurement precision of height is presented, and the expression of the optimal baseline is derived.Based on the variation of azimuth angle on the condition that pointing error of the echo-receive-only satellite antenna is generated in the antenna coordinate system, the effect of this error on the system performance and interferometry is explored, and the effective deviation of antenna pointing is taken into account.The influence of system errors, including amplitude, phase errors, and orthogonal error, are analyzed and simulated. In the result system errors have an effect on the pulse compression in the range. And the errors of signal generators that invole the errors of reference source and chirp signal generator are researched. Due to that, phase errors are produced in the azimuth direction, while azimuth compression will be affected by the phase errors. After the analysis and simulation the restriction indicators of errors are set up based on simulation results.Finally, the time and frequency synchronization errors are analyzed in the digital data processing of distributed InSAR.
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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar: institutional sub-
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