基于GNSS-R的裸土圆极化散射特性研究

GNSS-R是利用导航卫星的反射信号对地物参数进行遥感的新兴对地观测方式。针对其特有的圆极化散射方式，以双站散射的高级积分方程模型为工具，利用极化合成的方法将随机粗糙地表面圆极化散射模型转换为可以计算各种极化的微波散射模型。重点模拟分析了不同土壤水分含量下，裸土在不同观测几何时的圆极化散射特性。随机粗糙地表面圆极化散射模型的发展在某种程度上填补了GNSS-R领域机理模型的空缺，为后续土壤水分的进一步反演提供了机理工具。 

Bare soil circular polarization scattering properties for GNSS-R applications

GNSS-R is a new way of earth observation that uses the reflected signals of navigation satellites to remotely sense the geophysical parameters. Its unique feature is the circular polarization scattering. This paper employs the advanced integral equation model of bistatic scattering as a tool, and uses polarization synthesis to convert the random rough surface scattering model into a microwave scattering model that can calculate various polarizations. Simulation and analysis of the circular polarization scattering characteristics of bare soil under different observation geometries and different soil moisture contents are carried out. To some extent, the development of the random rough surface circular polarization scattering model fills the gap in the GNSS-R mechanism, and provides a tool for the subsequent further inversion of soil moisture.