Random Surface Scattering Models of RR Polarization for SoOp-R/GNSS-R Application

分类： 天文学 >> 天文学 分类： 地球科学 >> 大地测量学 提交时间： 2024-02-05

Xuerui Wu Lixiong Chen Jiancheng Shi

摘要： LR polarization is commonly used for the corresponding geophysical parameters retrieval in GNSS#2; R(Global Navigation Satellite System-Reflectometry) or SoOP-R (Signal of Opportunity-Reflectometry) . However, the other polarization of the reflected signals has attracted more and more attention with the development . The popular used equation for RR polarization demonstrates that it decreases as the soil moisture content increase and this is in contradiction with the experiment data. Here, three new models have been developed: Spec4PolR (Specular reflectivity model for polarization GNSS#2; R), SPM4Pol (small perturbation model for polarization GNSS#2; R), and Umich4Pol (Umich model for polarization GNSS-R). The Mueller matrix of these three models has been presented and the wave synthesis technique is employed to calculate the reflectivity at RR polarization. Spec4polR employs only three elements in the Mueller matrix for the final reflectivity, while five elements for Umich4polR participate in the calculation and although all the elements of the SPM4Pol have constructed the Mueller matrix and only nine elements have been employed for calculation. Each elements' effects on the soil moisture content are presented and the final reflectivity at RR polarization has been illustrated. However, due to the simple formulations of Spec4Pol, its reflectivity at RR polarization still decreases as the soil moisture content increase. while the results of SPM4Pol and Umich4Pol are consistent with the measured data and the reflectivity at RR polarization increase as the soil moisture content increase. The accurate forward calculation of RR polarization is crucial for the subsequent retrieval algorithm of polarization GNSS-R/SoOP-R.

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