一种用于机载双天线InSAR系统的实时DEM生成方法及实现

发布时间：2018-01-10 14:26

本文关键词：一种用于机载双天线InSAR系统的实时DEM生成方法及实现　出处：《中国科学院大学学报》2014年05期 　论文类型：期刊论文

【摘要】：为满足实时地形测绘需求,从算法本质上解决运算量太大的问题,提出基于机载双天线InSAR系统的实时DEM生成算法.采用非线性ECS自配准成像算法,获取高精度配准的双通道SAR图像,省略了后续非常耗时的配准过程.对获取的双通道SAR图像,进行快速干涉滤波产生高质量干涉条纹,进而对该条纹采用基于密集残差点划分的快速相位展开算法,获得无缠绕干涉相位.对于传统非常耗时的参数定标问题,采用基于外部粗精度DEM数据的初始相位偏置实时估计算法,并结合在定标场获取的基线长度、基线倾角和绝对延迟时间等参数进行反演,实时获取DEM.通过算法实时性分析,给出硬件实现方案.实际InSAR数据处理结果验证了本算法的有效性.
[Abstract]:In order to meet the requirements of real-time terrain mapping, the algorithm essentially solves the problem of too much computation. A real-time DEM generation algorithm based on airborne dual-antenna InSAR system is proposed, and a nonlinear ECS self-registration algorithm is used to obtain high-precision dual-channel SAR images. The following very time-consuming registration process is omitted. High quality interference fringes are generated by fast interference filtering for the obtained two-channel SAR images. Furthermore, the fast phase unwrapping algorithm based on dense residual handicap partition is used to obtain the non-entangled interference phase, which is a time-consuming parameter calibration problem. The real time estimation algorithm of initial phase bias based on external coarse precision DEM data is used, and the parameters such as baseline length, baseline dip angle and absolute delay time obtained from the calibration field are used for inversion. Through the real-time analysis of the algorithm, the hardware implementation scheme is given. The actual InSAR data processing results verify the effectiveness of the algorithm.
【作者单位】：长沙理工大学电气与信息工程学院;国防科学技术大学电子科学与工程学院;民政部减灾和应急工程重点实验室;
【基金】：国家自然科学基金(41201468) 智能电网运行与控制湖南省重点实验室项目和湖南省教育厅项目(12C002)资助
【分类号】：TN958
【正文快照】： 干涉合成孔径雷达(InSAR)技术是采用2部天线同时对地观测(单轨模式)或1部天线2次近似平行观测(重轨模式)的方式,对观测场景分别成像进而利用2幅图像获取干涉相位,并由几何关系及该干涉相位信息采用相应干涉处理,提取地表高精度数字高程模型(digital elevationmodel,DEM).干涉

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