On the Problem of the Sea Ice Detection by Orbital Microwave Doppler Radar at the Nadir Sounding

作     者：Karaev, Vladimir Titchenko, Yury Panfilova, Maria Ponur, Kiril Ryabkova, Maria Meshkov, Eugeny Kovaldov, Dmitry 

作者机构：Russian Acad Sci IAP RAS Inst Appl Phys Nizhnii Novgorod 603950 Russia 

出 版 物：《REMOTE SENSING》 (遥感)

年 卷 期：2022年第14卷第19期

页      面：4937-4937页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 1002[医学-临床医学] 070801[理学-固体地球物理学] 07[理学] 08[工学] 0708[理学-地球物理学] 0816[工学-测绘科学与技术] 

基　　金：Russian Science Foundation [RSF 20-17-00179] 

主　　题：Doppler spectrum of the backscattered radar signal sea ice sea waves knife-like antenna beam kurtosis coefficient retrieval algorithm 

摘      要：Orbital radars are used to monitor the state of the sea ice in the Arctic and Antarctic. The backscattering radar cross section (RCS) is used to determine the type of scattering surface. The power of the reflected signal depends on many factors, so the problem of separating sea ice and sea waves is not always unambiguous. Previous research has shown that microwave Doppler radar installed on aircrafts can be used to determine the boundary of sea ice. The width of the Doppler spectrum for wide or knife-like antenna beam depends on the statistical parameters of the reflecting surface, so sea ice and sea waves are easily separated. However, when installing a Doppler radar on a satellite, the spatial resolution becomes extremely low. In this research, we discuss the possibility of improving the spatial resolution by dividing the antenna footprint into elementary scattering cells. To do this, it is proposed to use the original incoherent synthesis procedure, which allows one to determine the dependence of the RCS on the incidence angle for an elementary scattering cell. Numerical modeling was performed and processing of model data confirmed that sea ice and sea waves are separated. The coefficient of kurtosis was used as a criterion in the algorithm. In addition, for sea waves, it is possible to determine the mean square slopes (mss) of large-scale waves, compared to the electromagnetic wavelength of sea waves along the sounding direction.