Back propagation method for GPS radio occultation data

	Back propagation method for GPS radio occultation data
	Xu Xian-Sheng 1,4; Huang Si-Xun 2; Guo Peng3 ; Hong Zhen-Jie 4
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2011-09-01
卷号	54 期号:9 页码:2193-2200
关键词	GPS/LEO radio occultation Atmospheric multipath Back propagation method Geometric optics method Multiple-phase-screen model
英文摘要	For determination of bending angle profiles from radio occultation in multipath areas, two methods, i. e., the geometric optics (GO) method and back propagation (BP) method, are compared and discussed. The GO method does not work well in multipath areas while in the BP method electromagnetic field can be back-propagated from multipath area to a single-ray area for reducing multipath effects. The atmospheric propagation of GPS signals under multipath conditions and their detection are simulated by using multiple-phase-screen model. Under the assumption of ideal signal, bending angles computed by the GO method and BP method are compared with corresponding solutions to Abel integral (true), the results reflect that the BP method is much closer to Abel integral in multipath area. About 15000 CHAMP radio occultations from March to July in 2007 are retrieved by the GO method and BP method, statistical comparisons of the retrieval refractivity profiles with that of ECMWF show that the average deviation and variance of fractional difference in refractivity retrieved by the BP method are generally smaller than that by the GO method in the lower troposphere of the southern hemisphere (30 degrees S similar to 90 degrees S), the tropics (30 degrees S similar to 30 degrees N), as well as the northern hemisphere (30 degrees N similar to 90 degrees N). The results confirm that the BP method can solve the problem of calculating bending angle profiles within multipath regions better than the GO method.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geochemistry & Geophysics
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	ATMOSPHERIC BOUNDARY-LAYER ; LOWER TROPOSPHERE ; INVERSION METHODS ; SIGNALS ; PROFILES
收录类别	SCI
语种	英语
WOS记录号	WOS:000295500000001
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/26375]
专题	上海天文台_天文地球动力学研究中心
作者单位	1.Shanghai Univ, Shanghai Inst Appl Math & Mech, Shanghai 200072, Peoples R China 2.PLA Univ Sci & Technol, Inst Meteorol, Nanjing 211101, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Wenzhou Univ, Sch Math & Informat Sci, Wenzhou 325027, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Xu Xian-Sheng,Huang Si-Xun,Guo Peng,et al. Back propagation method for GPS radio occultation data[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2011,54(9):2193-2200.
APA	Xu Xian-Sheng,Huang Si-Xun,Guo Peng,&Hong Zhen-Jie.(2011).Back propagation method for GPS radio occultation data.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,54(9),2193-2200.
MLA	Xu Xian-Sheng,et al."Back propagation method for GPS radio occultation data".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 54.9(2011):2193-2200.