【作者】 王萍；

【导师】 汪长城； 李志伟；

【作者基本信息】 中南大学 ， 测绘科学与技术， 2014， 硕士

【摘要】 摘要：极化干涉SAR技术是将极化SAR与干涉SAR结合而新兴起的一个微波遥感技术,他具有对目标高度及物理特性敏感的优势。随着高分辨率雷达数据的获取,极化干涉SAR数据处理及应用存在很多机遇和挑战。本文针对高分辨率雷达数据分析极化方向角补偿对极化干涉SAR数据的影响,着重讨论方向角对干涉相位及PolInSAR模型分解的作用。主要包括以下几个内容：(1)利用建筑物模型及真实高分辨率SAR数据分析建筑物目标的成像特点,总结归纳四种常见的地物散射模型,进而有助于我们理解和掌握建筑物目标的成像机理。(2)实现将极化方向角补偿引入到传统的干涉相位提取,给出极化方向角补偿的干涉相位计算公式并对其进行评价,实验表明该方法提高了传统干涉相位获取的准确性。(3)进一步研究了极化干涉SAR模型分解理论,并应用到建筑物散射相位中心的确定中,针对该过程中得到的相位中心及散射强度进行评价,最终确定常规极化干涉模型分解存在相位中心及散射强度错误估算的问题,因而提出极化方向角补偿的PolInSAR散射模型分解方法。该方法克服了传统分解方法的缺陷,实验结果更符合实际。(4)利用极化方向角补偿的干涉相位和散射相位中心实现建筑物高度提取,并且将极化方向角补偿的PolInSAR模型分解方法得到的散射相位中心与建筑物平面模型结合,实现建筑物三维模型重建。更多还原

【Abstract】 Abstract:Polarimetric interferometric SAR (PolInSAR), which combines interferometry SAR and polarimetry SAR, is a new technology of microwave remote sensing. PolInSAR is sensitive to the physical property and height of ground. With the obtainability of high resolution data, Polarimetric SAR interferometry has great adventures and advantages. This paper mainly surveys the polarization orientation angle effects on PolInSAR data, especially for interferometric phase and scattering phase center of different scattering mechanisms. And the main work of the paper lies in the follows:(1) We analyze the scattering characteristic of building by model making and real SAR data to help us understand the behavior of building in radar image. Then we show the common four scattering models, they are direct scattering model, double-bounce scattering model, volume scattering model and helix scattering model, respectively.(2) Interferometric SAR with the polarization orientation angle compensation has been developed in this paper, and this paper also deduce the interferometric phase after orientation angle compensation. Then we assess the difference between traditional InSAR and polarization orientation angle compensated InSAR by theory and test analysis. And the results indicate that the new method improves the accuracy of phase.(3) The theory of PolInSAR model decomposition is realized and applied to identify phase center of different scattering mechanisms. In this exercise, we propose to apply the polarization orientation angle to PolInSAR model decomposition for the wrong estimation of scattering mechanisms. The orientation angle compensated PolInSAR decomposition overcome the wrong estimation of phase centers and scattering power. We also evaluate the power and phase contribution of polarization orientation angle compensation.(4) Based on the polarization orientation angle compensation, we make use of the interferometric phase and scattering phase center to acquire the height of building, and to rebuilt their3-D model. In this test, we validate the above theory and explore new applications of PolInSAR technology, at the same time.更多还原