The mean echo and echo cross product from a beamforming interferometric altimeter and their application to elevation measurement
The mean echo and echo cross product from a beamforming interferometric altimeter and their application to elevation measurement
复制标题
波束形成干涉高度计的平均回波和回波叉积及其在高程测量中的应用
DOI：
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发表时间：
2004
影响因子：
8.2
通讯作者：
D. Wallis
中科院分区：
文献类型：
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作者：
D. Wingham;L. Phalippou;C. Mavrocordatos;D. Wallis
本文描述了波束形成干涉测高仪从与球体成一定角度倾斜的均匀散射表面发出的回波，该表面下面是均匀散射体。粗糙的“表面”脉冲响应和回波和干涉的叉积被确定为波束方向和矢量表面梯度的函数。这些表达式用于确定来自这样的系统的多视回波和干涉相位。定义了“有效”视数和多视回波相干性，它们决定了回波功率和干涉相位的统计特性。作为表面矢量梯度，表面粗糙度，体积散射，和SNR的函数的多视回波功率和干涉相位的依赖关系进行了研究。这些行为说明了使用基于实际系统的值。根据有效视数和多视回波与叉积的相干性，检验了仰角测量的精度。讨论了从回波功率实际恢复距离的一些结论。
This paper describes the echo from a beamforming interferometric altimeter from a uniformly scattering surface inclined at an angle to a sphere, underlain by a uniformly scattering volume. The rough "surface" impulse response and the echo and interferometric cross product are determined as functions of the beam direction and the vector surface gradient. These expressions are used to determine the multilooked echo and interferometric phase from such a system. The "effective" number of looks and the multilooked echo coherence, which determine the statistics of the echo power and the interferometric phase, are defined. The dependence of the multilooked echo power and interferometric phase are investigated as functions of the surface vector gradient, surface roughness, volume scattering, and SNR. These behaviors are illustrated using values based on a practical system. The precision of the elevation measurement is examined in the light of the effective number of looks and the coherence of the multilooked echo and cross product. Some conclusions concerning the practical recovery of the range from the echo power are discussed.