Abstract
Abstract. The Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) is one of the new-generation payloads on board the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth's neutral atmosphere and ionosphere. FY-3C GNOS, on board the FY-3 series C satellite launched in September 2013, was designed to acquire setting and rising radio occultation (RO) data by using GNSS signals from both the Chinese BeiDou Navigation Satellite System (BDS) and the US Global Positioning System (GPS). So far, the GNOS measurements and atmospheric and ionospheric data products have been validated and evaluated and then been used for atmosphere- and ionosphere-related scientific applications. This paper reviews the FY-3C GNOS instrument, RO data processing, data quality evaluation, and preliminary research applications according to the state-of-the-art status of the FY-3C GNOS mission and related publications. The reviewed data validation and application results demonstrate that the FY-3C GNOS mission can provide accurate and precise atmospheric and ionospheric GNSS (i.e., GPS and BDS) RO profiles for numerical weather prediction (NWP), global climate monitoring (GCM), and space weather research (SWR). The performance of the FY-3C GNOS product quality evaluation and scientific applications establishes confidence that the GNOS data from the series of FY-3 satellites will provide important contributions to NWP, GCM, and SWR scientific communities.
Highlights
The FengYun 3 series C (FY-3C) satellite precise orbit determination (POD) performance has been evaluated by difference global navigation satellite system (GNSS) data processing centers (Liao et al, 2016b; Li et al, 2017; Xiong et al, 2017; Zhao et al, 2017) by using the Bernese software (Liao et al, 2016b) and Position And Navigation Data Analyst (PANDA) software (Zhao et al, 2017) separately
The results indicated that FY-3C GNSS Occultation Sounder (GNOS) radio occultation (RO) data have a positive effect on analysis and forecast in all medium-term forecast ranges in Global/Regional Assimilation and Prediction System (GRAPES), in the Southern Hemisphere, where conventional observations are lacking, and in the Northern Hemisphere, where data are more dense
FY-3C GNOS is the first BeiDou Navigation Satellite System (BDS)- and Global Positioning System (GPS)-capable GNSS RO sounder in space and combines a state-of-the-art RO receiver, which has been successfully running in orbit for more than 4 years
Summary
The global navigation satellite system (GNSS) radio occultation (RO) technique (Melbourne et al, 1994; Ware et al, 1996) for sounding the Earth’s neutral atmosphere and ionosphere was demonstrated by the proof-of-concept Global Positioning System/Meteorology (GPS/MET) mission launched in 1995 (Ware et al, 1996; Kursinski et al, 1996; Kuo et al, 1998) as well as the following GNSS RO missions: the Challenging Mini-satellite Payload (CHAMP; Wickert et al, 2001, 2002); the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC; Anthes et al, 2000, 2008; Schreiner et al, 2007), the Gravity Recovery and Climate Experiment (GRACE; Beyerle et al, 2005; Wickert et al, 2005); and the Meteorological Operational (MetOp) satellites (Edwards and Pawlak, 2000; Luntama et al, 2008).
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