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首页> 外文会议>Conference on SAR Image Analysis, Modeling, and Techniques III, Sep 25-27, 2000, Barcelona, Spain >An automated method to estimate the baseline parameters for deriving the accurate digital elevation model
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An automated method to estimate the baseline parameters for deriving the accurate digital elevation model

机译：估算基线参数以得出准确的数字高程模型的自动方法

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摘要

This paper describes a Synthetic Aperture Radar (SAR) phase processing system and an automated method for estimating baseline length and its inclination angle from only pair of Single Look Complex (SLC) images to be interfered. The information about the baseline parameters are indispensable to produce accurate Digital Elevation Model (DEM) without geometrical distortion and also accurate displacement from differential Interferometric SAR (InSAR) processing. Only the nominal value of the baseline length is currently provided. The fixed value, however, does not represent nonparallel orbits from which raw interferogram is obtained. The ambiguity causes the geometrical distortion in DEM and the apparent displacement in the result of differential InSAR processing. In order to produce the accurate DEM, we have to know the baseline parameters as the function of the azimuth line. The proposed method derives coefficients of both functions for baseline length and for inclination angle by fitting the local disparities to a geometrical model. The proposed method was successfully applied to an actual InSAR data. The baseline estimated by the proposed method reduced apparent displacement to 1 /10 of that yielded by the nominal baseline. A piecewise co-registration method is also described for obtaining highly accurate interferogram.
机译：本文介绍了一种合成孔径雷达（SAR）相位处理系统和一种自动方法，该方法可以仅从一对受干扰的单眼复杂（SLC）图像中估计基线长度及其倾斜角度。有关基线参数的信息对于产生没有几何失真的精确数字高程模型（DEM）以及从差分干涉SAR（InSAR）处理获得的精确位移都是必不可少的。当前仅提供基线长度的标称值。然而，该固定值并不代表从其获得原始干涉图的非平行轨道。模糊性会导致DEM的几何变形和差分InSAR处理结果中的表观位移。为了产生准确的DEM，我们必须知道基线参数是方位线的函数。所提出的方法通过将局部视差拟合到几何模型来导出基线长度和倾斜角度的两个函数的系数。该方法已成功应用于实际的InSAR数据。通过提出的方法估算的基线将表观位移减少到名义基线所产生位移的1/10。还描述了用于获得高精度干涉图的分段共配准方法。

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