干涉合成孔径雷达目标的三维重建

3D RECONSTRUCTION OF TARGETS IN INTERFEROMETRIC SAR

干涉SAR目标的三维重建是利用干涉SAR的基本测量值和干涉SAR成像的几何关系确定地面目标点的三维位置。现有算法均建立在平面电磁波、平地假设的基础上,不可避免地引入严重的位置误差。该文从干涉SAR的基本方程入手,在球形地球和球面电磁波的普遍模型基础上,推导出干涉SAR三维重建的解析解,并将该算法与现有三维重建算法进行了数值计算比较。

3D reconstruction of targets in Interferometric SAR (InSAR) refers to determine target's 3D position based on principal measurements of radar and the InSAR imaging geometry. Several algorithms have been proposed for InSAR. These algorithms rely on simplifying assumptions, such as the flat earth approximation and the plane wave approximation. Significant location errors of targets have been introduced by these approximations. In this paper, a new algorithm is proposed on the models of spherical earth and spherical wave. The solution is given in a closed form only using the measured quantities: orbit parameters, range time, Doppler shift, and interferometric phase. This analytical solution demonstrates more exact than the existing algorithms.