作为外辐射源雷达的GNSS-R 遥感多极化问题

基金项目:

中国气象科学研究院灾害天气国家重点实验室开放课题(2013LASW-A09)，民政部灾害评估与风险防范重点实验室开放课题(NDRCCPICC201302)，中国气象局公益性行业(气象)科研专项《导航卫星电离层三维探测技术研究和探空技术开发》和十二五民用航天预先研究项目资助课题

Issues on Multi-polarization of GNSS-R for Passive Radar Detection

1.
(State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China)
2.
(Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China)
3.
(Meteorological Observation Center, China Meteorological Administration, Beijing 100081, China)

摘要: GNSS 反射信号遥感技术(GNSS Reflectometry, GNSS-R)是外辐射源雷达遥感领域一项蓬勃发展的新兴遥感技术。该文从极化基础理论入手，对GNSS-R 遥感多极化问题进行较全面的讨论，分别完成圆极化(左旋、右旋)和线极化(垂直、水平)接收方式下地表反射率与介电常数隐函数关系式的推导，并通过地基GNSS-R 土壤湿度试验数据对公式合理性进行验证。该文的研究结论能够为GNSS-R 仿真分析、观测试验设计、建模方法研究、数据处理与校正等提供参考。
- 外辐射源雷达 /
- GNSS-R /
- 多极化 /
- 土壤湿度
Abstract: GNSS Reflectometry (GNSS-R) is a currently developed remote sensing technology which belongs to the passive radar domain. This paper aims to deal with some issues on multi-polarization of GNSS-R technology. Four different polarization patterns of the received GNSS-R signal are discussed, including rl, rr, rv, rh. For each polarization, formulas for calculating the surface reflectivity () using dielectric constant () and satellite elevation angle () are derivated. The rationality of these formulas is validated using data from a ground-based GNSS-R soil moisture experiment. The results of this research can provide references for further GNSS-R research, including simulation, experiment design, model development and data processing.
- Passive radar /
- GNSS Reflectometry (GNSS-R) /
- Multi-polarization /
- Soil moisture