多基线InSAR获取高精度DEM技术研究

项目名称： 多基线InSAR获取高精度DEM技术研究

项目编号： No.40871213

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 徐青

作者单位： 中国人民解放军信息工程大学

项目金额： 40万元

中文摘要： 为了解决面向复杂地形的InSAR处理难题，提高干涉数据的利用率和高程测量精度，本项目对多基线InSAR获取高精度DEM技术进行了研究，设计了由最短基线开始的差分滤波多基线InSAR处理方案、应用贝叶斯方法估计侧视角的多基线InSAR处理方案和多套干涉图综合相位解缠的多基线InSAR处理方案。借鉴摄影测量中的影像正射纠正方法，设计了多基线InSAR干涉图的直接法仿真方案和间接法仿真方案，为多基线InSAR相位解缠研究提供了充分的实验数据；将中国余数定理引入到多基线InSAR相位解缠中，设计了基于中国余数定理的多基线InSAR相位解缠方法，扩展了干涉相位的非模糊区间，解决了欠采样和混叠干涉相位的解缠难题；设计了基于差分滤波的多基线InSAR相位解缠方法，在对最短基线干涉图进行滤波和相位解缠基础上，利用较短基线干涉图的解缠结果指导较长基线干涉图的相位解缠，解决了较长基线干涉图中欠采样区域的相位解缠难题。在项目研究基础上，获得了国家技术发明专利"基于中国余数定理的多基线、多波段InSAR相位解缠方法"。本项目的研究成果在高精度地形测绘、国民经济建设和国防建设等方面均具有广阔的应用前景。

中文关键词： 多基线；合成孔径雷达；干涉测量；数字高程模型；相位解缠；

英文摘要： In order to solve the difficulty in InSAR processing for complex terrain,to improve the utilization rate of interferometric data and the accuracy of derived height, the technology of multi-baseline InSAR for deriving accurate DEM was researched. The multi-baseline InSAR processing scheme with difference and filter from minimum baseline was designed. The scheme with incidence angle estimation by Bayesian algorithm and the one with phase unwrapping for multiple inteferograms were designed too. The simulation algorithms of multi-baseline InSAR Interferogram including direct method and indirect method were proposed, as took orthphoto flow in photogrammetry for reference.They can provide sufficient data for phase unwrapping studied. The phase unwrapping of multi-baseline InSAR with Chinese Remainder Theorem was designed.It can expand the non-fuzzy interval of interferometric phase to solve the difficulty in Phase unwrapping for subsampling and confusion areas.The phase unwrapping method based on difference and filtering for multi-baseline InSAR was proposed.It unwraps the phases of longer baseline by taking phase unwrapping results of shorter baseline for reference in the condition of the interferogram of minimum baseline was unwrapped. It can solve the difficulty in phase unwrapping for subsampling areas with longer baseline.The national technology invention patent of 'Phase Unwrapping Algorithm with Chinese Remainder Theorem for Multi-baseline InSAR and Multi-band InSAR' was won based on the research. Its harvest has a broad application prospect, it can be used in accurate terrain surveying and mapping, national economy construction and national defence construction, etc.

英文关键词： Multi-baseline; SAR;Interferometry; DEM;Phase Unwrapping;