Assessment of FY-3E GNOS-II GNSS-R Global Wind Product

• Published in: IEEE journal of selected topics in applied earth observations and remote sensing Vol. 15; pp. 7899 - 7912
• Main Authors: Huang, Feixiong, Xia, Junming, Yin, Cong, Zhai, Xiaochun, Xu, Na, Yang, Guanglin, Bai, Weihua, Sun, Yueqiang, Du, Qifei, Liao, Mi, Hu, Xiuqing, Zhang, Peng, Duan, Lichang, Liu, Yan
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Beidou (BDS); Cyclones; Datasets; FengYun-3E (FY-3E); Geography; Global navigation satellite system; Global Navigation Satellite System Occultation Sounder II (GNOS-II); Global Navigation Satellite System Reflectometry (GNSS-R); Global Positioning System; Global Positioning System (GPS); Global positioning systems; GPS; Incidence angle; Moisture effects; Navigation; Navigational satellites; ocean wind; Positioning systems; retrieval; Satellite broadcasting; Satellite observation; Satellites; Scatterometers; Signal to noise ratio; Soil moisture; Spaceborne radar; Table lookup; Time dependence; validation; Weather forecasting; Wind; Wind speed; Winds
• ISSN: 1939-1404; 2151-1535
• DOI: 10.1109/JSTARS.2022.3205331

Two different Global Navigation Satellite System (GNSS) Reflectometry wind products are to be developed for the Global Navigation Satellite System Occultation Sounder II (GNOS-II) payload on the FengYun-3E (FY-3E) satellite: A global wind product optimized for global low-to-medium wind speeds and a cyclone wind product optimized for high wind speeds in the tropical and extratropical cyclones. This article presents a comprehensive assessment of the GNOS-II global wind product for both global positioning system (GPS) and Beidou (BDS) product at wind speeds below 25 m/s using its data of first six months. Three datasets, including the European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis, HY-2B scatterometer and Soil Moisture Active Passive (SMAP) winds, are used for the assessment. The assessment of the Level 1 observables shows that the instrument's performance and calibration are generally stable. For the assessment of retrieved winds, the general performances of GPS and BDS products are similar. The overall wind speed root-mean-square error is 1.54 m/s for GPS-R and 1.44 m/s for BDS-R when compared with ECMWF, 1.48 m/s for GPS-R and 1.36 m/s for BDS-R when compared with HY-2B, and 2.08 m/s for GPS-R and 2.04 m/s for BDS-R when compared with SMAP. The overall wind speed biases for GPS-R and BDS-R are about zeros when compared with each dataset. The assessment is also made by the dependence on time, signal-to-noise ratio, observable, GNSS block, wind speed, incidence angle, and geography. Overall, the FY-3E GNOS-II global wind product is consistent over time and space with an accuracy meeting the requirement of operational use.