Terrain height estimation using GMTI radar

C. Morgan, S. Jaroszewski, P. Mountcastle
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Abstract

We simulate the performance of existing and planned tactical GMTI (ground moving target indicator) systems using data cubes derived from high-fidelity interferometric SAR measurements, to assess the utility of these GMTI systems for an auxiliary terrain height estimation function. The two systems are current and next generation GMTI radars with linear and planar arrays, respectively, that could be mounted on a manned aircraft or a large UAV. In order to achieve the vertical element separation required for interferometric terrain height estimation, the antenna array in the first case must be pitched up relative to the horizontal position that is ordinarily used for DPCA or STAP clutter suppression. The purpose of the study is to determine whether useable terrain elevation maps can be generated by interferometric techniques within the operational constraints of these systems. Such elevation map data, obtained using a GMTI radar, would be valuable to knowledge-aided algorithms which rely on precise three-dimensional registration of radar data with terrain or road databases.
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基于GMTI雷达的地形高度估计
我们使用来自高保真干涉SAR测量的数据立方体模拟了现有和计划中的战术GMTI(地面移动目标指示器)系统的性能,以评估这些GMTI系统作为辅助地形高度估计函数的效用。这两种系统是当前和下一代GMTI雷达,分别采用线性和平面阵列,可以安装在有人驾驶飞机或大型无人机上。为了实现干涉地形高度估计所需的垂直单元分离,在第一种情况下,天线阵列必须相对于通常用于DPCA或STAP杂波抑制的水平位置倾斜。这项研究的目的是确定在这些系统的操作限制下,是否可以通过干涉测量技术生成可用的地形高程图。使用GMTI雷达获得的这种高程图数据,对于依靠雷达数据与地形或道路数据库精确的三维配准的知识辅助算法将是有价值的。
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