文献类型：期刊文献

英文题名：Bistatic scattering simulations of circular and linear polarizations over land surface for signals of opportunity reflectometry

作者：Wu, Xuerui[1,2];Song, Yezhi[1,2];Xu, Jin[3];Duan, Zheng[4];Jin, Shuanggen[1,2]

机构：[1]Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China;[2]Univ Chinese Acad Sci, Beijing, Peoples R China;[3]Guangdong Ocean Univ, Maritime Coll, Zhanjiang 524088, Peoples R China;[4]Lund Univ, Dept Phys Geog & Ecosyst Sci, Lund, Sweden

年份：2021

卷号：8

期号：1

外文期刊名：GEOSCIENCE LETTERS

收录：SCI-EXPANDED(收录号：WOS:000636465400001)、、Scopus(收录号：2-s2.0-85103817181)、WOS

基金：This research was funded by the National Natural Science Foundation of China (No. 42061057 &NO.41501384&42074042). The authors would be very grateful for the suggestions given by Dr. Andres Calabia in School of Remote Sensing and Geomatics Engineering, Nanjing University of Information Science and Technology.

语种：英文

外文关键词：SoOp Refletometry; GNSS-R; Soil moisture; Vegetation; Polarization; Bistatic scattering

外文摘要：Signals of Opportunity Reflectometry (SoOp-R) employs the communication system, GNSS (Global Navigation Satellite System) constellation and other potential Signals of Opportunity (SoOp) as the transmitters. In recent years, it has gained increased interests. Several experiments have been carried out, however it is still in the initial development stage. Theoretical predictions of SoOp Reflectometry for land surface parameters detection, such as soil moisture and vegetation biomass, should be carried out simultaneously. Meanwhile, at present less works are paid attention to the polarization study of the polarizations. The first-order radiative transfer equation models are employed here and they are developed according to the wave synthesis technique to get the various polarization combinations. Using the two models as analysis tools, we simulate the bistatic scattering at all potential SoOp Reflectometry bands, i.e., P-, L-, C- and X-band for circular polarizations and linear polarizations. While the original commonly used microwave scattering models are linear polarizations, here we compare the difference. Although the models can simulate bistatic scattering at any incident angles and scattering angles. Four special observation geometry are taken into considerations during the analysis. Using the developed models as tools, the developed models establish the relationship between the land surface parameters (such as soil moisture, soil roughness and vegetation water content, diameters et al.) and bistatic radar cross section. The forward scattering models developed here enables the understanding of the effects of different geophysical parameters and transmitter-receiver observation scenarios on the bisatic scattering at any polarization combinations for any potential SoOP reflectometry bands. Robust retrieval methods for soil moisture and vegetation biomass can benefit from the forward scattering models.