地表后向散射测量实验及其等效介电常数和粗糙度参数的反演

发布时间：2018-01-05 04:08

本文关键词：地表后向散射测量实验及其等效介电常数和粗糙度参数的反演　出处：《电波科学学报》2016年01期 　论文类型：期刊论文

【摘要】：由于地物类型繁多且分布不均匀,地表粗糙度的测量存在不准确性,且地表分层、体散射机理较难准确界定.针对上述问题,将裸土和水泥路面在入射角小于66°的散射模型等效为面散射模型,联合中国电波传播研究所X波段裸土和Ku波段水泥路面的后向散射实测数据,采用遗传算法同时反演了地表的等效介电常数和等效粗糙度参数,并采用剩余实测数据对反演结果进行了验证,吻合良好.该等效面散射模型在保证裸土和水泥路面后向散射预测精度的同时,降低了模型复杂度,仅需反演面散射模型的3个等效参数(等效均方根高度、等效相关长度和等效介电常数)即可实现对复杂地表后向散射特性的快速、准确预测,具有重要的工程应用价值.
[Abstract]:Due to various types of objects and the uneven distribution of the surface roughness measurement inaccurate, and the surface layer, scattering mechanism is difficult to define. In view of the above problems, the bare soil and cement pavement in the scattering model of equivalent incident angle less than 66 degrees to the surface scattering model, the joint China Research Institute of Radio Wave Propagation, bare soil and X band Ku band of cement pavement backscatter data, using the genetic algorithm and the inversion of surface effective permittivity and roughness parameters, and the remaining measured data on the inversion results were verified in good agreement. The equivalent surface scattering model of the prediction accuracy and to ensure scattering in bare soil and cement pavement. To reduce the complexity of the model, only 3 equivalent parameter inversion of surface scattering model (equivalent RMS height, equivalent length and equivalent dielectric constant) can be realized on complex surface to The rapid and accurate prediction of scattering characteristics is of great value in engineering applications.

【作者单位】：西安电子科技大学物理与光电工程学院;中国电波传播研究所;
【基金】：国家自然科学基金(61172031)
【分类号】：P237
【正文快照】： 引言近年来,随着空间技术的发展,遥感已成为人类开发地球资源,监测自然环境以及了解生态系统变化的最有效手段之一.地物在地球的水文和生物圈内扮演着重要角色,对地面的遥感探测[1-4]可反演获得大量的地物信息,如农作物成熟度[1]、地表含水量[2]以及地表目标[3]等情况,对该类

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