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Research on Ground-Based SFCW SAR Differential Interferometry Techniques

Author: ZhangXiang
Tutor: LuBiYing
School: National University of Defense Science and Technology
Course: Electronic Science and Technology
Keywords: Foundations synthetic aperture radar Stepping frequency continuous wave Differential interferometry Complex Image Registration Atmospheric effects
CLC: TN957.52
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


The foundation stepping frequency continuous wave (Stepped Frequency Continuous Wave, SFCW) synthetic aperture radar (SAR) differential interferometric techniques submillimeter measurement accuracy can be obtained with a long-range, large-scale, continuous space coverage of the real-time monitoring capabilities in artificial large buildings and surface deformation monitoring field has broad application prospects. Observation model and differential foundation SFCW SAR interferometry signal processing flow based on the foundation SFCW SAR system on how to improve measurement accuracy, research foundation SFCW SAR differential interferometric measurement of certain key technologies. First, create a foundation SFCW SAR observation model, and then combined with the observation model analysis step frequency continuous wave distance and azimuth synthetic aperture imaging principle, the foundation SFCW SAR differential interferometry data handling processes. Measurement accuracy of the to affect foundation SAR differential interferometry main factors - the instability of the observation platform, the instability of the system frequency interferometric phase error and deformation true value solver error simulation analysis. Second, the research foundation SFCW SAR differential interferometric measurements in two key technical issues - foundation SAR complex image sub-pixel level registration and atmospheric effects influence correction technology. SAR complex image registration in the foundation study SAR complex image registration steps and commonly used method based on the use of foundation SAR complex image with complex image registration method based on the combination of Fourier-Mellin transform and coherence accurate and measured image data validation, access to sub-pixel registration accuracy. The impact of the correction of the atmospheric effects, in-depth analysis of atmospheric effects on ground-based SAR differential interferometry, a the artificial control point correction method and meteorological data calibration method, atmospheric effects affect the calibration test program to verify the correction effect to improve foundation SFCW SAR differential interferometric measurement accuracy. Then, the use of the existing foundation SFCW SAR system, design a the differential interferometric displacement measurement test, test foundation SFCW SAR systematic differential interferometry performance submillimeter measurement accuracy, high dynamic target deformation, high-precision measurements. Finally, the foundation SFCW SAR differential interferometric techniques applied to the body wall moving target detection, an image difference and interferometric phase moving target detection method combined; on the basis of the traditional image difference change detection, further interferometric phase detection greatly reduces the false alarm rate, under the premise of the same detection probability.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar equipment,radar > Radar receiving equipment > Data,image processing and admission
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