基于极化雷达的裸露地表土壤水分反演研究

为准确、快速提取大范围裸露地表土壤水分空间分布，以河套平原巴彦淖尔市杭锦后旗陕坝镇灌区土壤水分四极化精细模式雷达监测为例，研究基于RADARSAT-2数据土壤水分提取的技术与方法，选择AIEM模型作为研究区裸露地表土壤水分反演模型的基础，建立适合河套灌区裸露地表土壤水分微波散射的经验模型。应用经验模型对河套灌区地表水分进行反演研究并与实测数据进行相关性分析。结果表明极化组合VV-VH的相关程度高达0.931 1，经验模型能够满足土壤水分监测的需要，优于传统土壤水分分类方法，促进了极化微波遥感在土壤水分监测中的开拓应用。

Research on Soil Moisture Inversion at Bare Ground Surface Using the Polarization Radar

To retrieve the spatial distribution of bare surface’s soil moisture at a large scale accurately and instantly，based on a commercial satellite named RADARSAT 2, the authors studied the technique and method of soil moisture retrieving. An irrigation zone of Hetao Plain, located in Shanba town, Hanggin county, Bayannur city, was taken as an example for soil moisture with four polarized radar refined monitoring. According to advanced integral equation model(AIEM), an empirical model of bare soil moisture with microwave scattering was established , which was suitable for Hetao irrigation area. The empirical model of surface water inversion in Hetao irrigation area was applied , and it was compared with the measured data through correlation analysis. The results indicate that relevant coefficient of polarization combination VV VH is as high as 0.9311. The model can meet the requirements of soil moisture monitoring, superior to traditional soil moisture classification methods. Finally, it promotes the application of polarized microwave remote sensing in soil moisture monitoring.