一种度量目标散射相似性的新参数

针对目标相似性参数度量分布式目标与典型目标散射相似程度不准确的问题,本文利用规范散射Pauli基矢量和分布式目标相干矩阵,定义了一个度量目标散射相似性程度的新参数--目标散射相似性.由于该参数综合考虑了分布式目标主散射机制、次要散射机制与规范散射的相似性,以及不同散射机制对廊的发生概率,因而它能准确反映分布式目标与规范目标散射的平均近似程度.与相似性参数一样,新参数具有目标旋转不变性、尺度无关性等特性.作为一种实际应用,给出了分布式目标与金属球、角反射器等典型目标的散射相似性.结合旧金山地区AIRSAR极化数据,讨论了这些相似性测度在地物分类方面的应用.

A new parameter to measure the scattering similarity between distributed targets and canonical targets

Aiming at the deficiency of the similarity parameter in applications to measure the degree of scattering similarity be-tween distributed targets and canonical targets, a new parameter, namely polarimetric scattering similarity, is proposed based on the Pauli vector of a canonical target and the coherency matrix of a distributed target in this paper. Since this parameter contains all similari-ty information between the scattering mechanisms of a distributed target and canonical mechanism, it describes accurately the degree of average scattering similarity between a distributed target and a canonical target. Furthermore, this new parameter is not only independ-ent of target sizes, but also independent of the target orientation angles just like the similarity parameter. As an application, the parame-ters to several canonical targets are derived and their applications in terrain classification are also discussed with AIRSAR data.