Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou radio occultation data from the FY-3C GNOS mission

	Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou radio occultation data from the FY-3C GNOS mission
	Bai, Weihua; Liu, Congliang; Meng, Xiangguang; Sun, Yueqiang; Kirchengast, Gottfried; Du, Qifei; Wang, Xianyi; Yang, Guanglin; Liao, Mi; Yang, Zhongdong
刊名	ATMOSPHERIC MEASUREMENT TECHNIQUES
	2018
卷号	11 期号:2 页码:819-833
ISSN号	1867-1381
英文摘要	The Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) is one of the new-generation payloads onboard the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth's neutral atmosphere and ionosphere. The GNOS was designed for acquiring setting and rising radio occultation (RO) data by using GNSS signals from both the Chinese BeiDou System (BDS) and the US Global Positioning System (GPS). An ultra-stable oscillator with 1s stability (Allan deviation) at the level of 10(-2) was installed on the FY-3C GNOS, and thus both zero-difference and single-difference excess phase processing methods should be feasible for FY-3C GNOS observations. In this study we focus on evaluating zero-difference processing of BDS RO data vs. single-difference processing, in order to investigate the zero-difference feasibility for this new instrument, which after its launch in September 2013 started to use BDS signals from five geostationary orbit (GEO) satellites, five inclined geosynchronous orbit (IGSO) satellites and four medium Earth orbit (MEO) satellites. We used a 3-month set of GNOS BDS RO data (October to December 2013) for the evaluation and compared atmospheric bending angle and refractivity profiles, derived from single-and zero-difference excess phase data, against co-located profiles from European Centre for Medium-Range Weather Forecasts (ECMWF) analyses. We also compared against co-located refractivity profiles from radiosondes. The statistical evaluation against these reference data shows that the results from single-and zero-difference processing are reasonably consistent in both bias and standard deviation, clearly demonstrating the feasibility of zero differencing for GNOS BDS RO observations. The average bias (and standard deviation) of the bending angle and refractivity profiles were found to be about 0.05 to 0.2% (and 0.7 to 1.6 %) over the upper troposphere and lower stratosphere. Zero differencing was found to perform slightly better, as may be expected from its lower vulnerability to noise. The validation results indicate that GNOS can provide, on top of GPS RO profiles, accurate and precise BDS RO profiles both from single-and zero-difference processing. The GNOS observations by the series of FY-3 satellites are thus expected to provide important contributions to numerical weather prediction and global climate change analysis.
语种	英语
资助机构	National Natural Science Foundation of China [41775034, 41505030, 41405039, 41405040, 41606206] ; Strategic Priority Research Program of Chinese Academy of Sciences [XDA15012300] ; Feng Yun 3 (FY-3) Global Navigation Satellite System Occultation Sounder (GNOS) development and manufacture project by NSSC/CAS ; Austrian Aeronautics and Space Agency of the Austrian Research Promotion Agency (FFG-ALR) [840070, 844395]
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/6185]
专题	国家空间科学中心_空间环境部
通讯作者	Liu, CL; Meng, XG (reprint author), Chinese Acad Sci NSSC CAS, Natl Space Sci Ctr, Beijing Key Lab Space Environm Explorat, Beijing, Peoples R China.; Meng, XG (reprint author), NSSC CAS, JLOAC, Beijing, Peoples R China.; Meng, XG (reprint author), Graz Univ, Graz, Austria.
推荐引用方式 GB/T 7714	Bai, Weihua,Liu, Congliang,Meng, Xiangguang,et al. Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou radio occultation data from the FY-3C GNOS mission[J]. ATMOSPHERIC MEASUREMENT TECHNIQUES,2018,11(2):819-833.
APA	Bai, Weihua.,Liu, Congliang.,Meng, Xiangguang.,Sun, Yueqiang.,Kirchengast, Gottfried.,...&Meng, XG .(2018).Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou radio occultation data from the FY-3C GNOS mission.ATMOSPHERIC MEASUREMENT TECHNIQUES,11(2),819-833.
MLA	Bai, Weihua,et al."Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou radio occultation data from the FY-3C GNOS mission".ATMOSPHERIC MEASUREMENT TECHNIQUES 11.2(2018):819-833.