Abstract
FengYun-3E (FY3E), launched on 5 July 2021, is one of China’s polar-orbiting meteorological satellite series. The GNOS II onboard FY3E is an operational GNSS remote sensor that for the first time combines GNSS radio occultation (GNSS RO) and GNSS reflectometry (GNSS-R). It has eight reflection channels that can track eight specular points at the same time, receiving reflected signals from multiple GNSS systems, including GPS, BeiDou and Galileo. The basic GNSS-R output generated by GNOS II is a 122 × 20 non-uniform delay-Doppler map whose high resolution portion captures more information near the specular point. This paper introduces the GNSS-R aspect of the FengYun-3E GNOS II, including the instrument, power calibration and wind speed retrieval algorithm. Preliminary validation results for its first four months of data are also presented. After preliminary quality control, the overall wind speed error is less than 2 m/s at wind speeds below 20 m/s for data from both GPS satellites and BeiDou satellites when compared to the ECMWF reanalysis winds.
Highlights
Global navigation satellite system reflectometry (GNSS-R), first proposed in 1993 [1], is technology that uses reflected signals from GNSS satellites such as GPS, BeiDou (BDS), GLONASS and Galileo for remote sensing
The geophysical model function (GMF) v1.0 trained by the simulated data was validated by comparing the observables and collocated ECMWF wind speeds
The GMF at an incidence angle of 30◦ for each observable is displayed in each figure as well
Summary
Guanglin Yang 1,2,† , Weihua Bai 3,4,5,6,7,† , Jinsong Wang 1,2, *, Xiuqing Hu 1 , Peng Zhang 1 , Yueqiang Sun 3,4,5,6,7 , Na Xu 1 , Xiaochun Zhai 1 , Xianjun Xiao 1 , Junming Xia 3,4,6,7 , Feixiong Huang 3,4,6,7 , Cong Yin 3,4,6,7 , Qifei Du 3,4,6,7 , Xianyi Wang 3,4,6,7 , Yuerong Cai 3,4,6,7 , Xiangguang Meng 3,4,6,7 , Guangyuan Tan 3,4,6,7 , Peng Hu 3,4,6,7 and Congliang Liu 3,4,6,7. Key Laboratory of Space Weather, National Center for Space Weather, China Meteorological Administration, Beijing 100081, China. Beijing Key Laboratory of Space Environment Exploration, Chinese Academy of Sciences, Beijing 100190, China. Joint Laboratory on Occultations for Atmosphere and Climate, National Space Science Center, Chinese. Key Laboratory of Science and Technology on Space Environment Situational Awareness, Chinese Academy of Sciences, Beijing 100190, China.
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