The transmission link of CAPS navigation and communication system

	The transmission link of CAPS navigation and communication system
	Cui JunXia1,2 ; Shi HuLi 1,2; Chen JiBin 3; Pei Jun1
刊名	SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY
	2009-03-01
卷号	52 期号:3 页码:402-411
关键词	satellite navigation satellite communication transmission link link margin demodulation threshold CAPS
英文摘要	The Chinese Area Positioning System (CAPS) is based on communication satellites with integrated capability, which is different from the Global Positioning System (GPS), the International Maritime Satellite Organization (Inmarsat) and so on. CAPS works at C-band, and its navigation information is not directly generated from the satellite, but from the master control station on the ground and transmitted to users via the satellite. The slightly inclined geostationary-satellite orbit (SIGSO) satellites are adopted in CAPS. All of these increase the difficulty in the design of the system and terminals. In this paper, the authors study the CAPS configuration parameters of the navigation master control station, information transmission capability, and the selection of the antenna aperture of the communication center station, as well as the impact of satellite parameters on the whole communication system from the perspective of the transmission link budget. The conclusion of availability of the CAPS navigation system is achieved. The results show that the CAPS inbound communication system forms a new low-data-rate satellite communication system, which can accommodate mass communication terminals with the transmission rate of no more than 1 kbps for every terminal. The communication center station should be configured with a large-aperture antenna (about 10-15 m); spread spectrum communication technology should be used with the spreading gain as high as about 40 dB; reduction of the satellite transponder gain attenuation is beneficial to improving the signal-to-noise ratio of the system, with the attenuation value of 0 or 2 dB as the best choice. The fact that the CAPS navigation system has been checked and accepted by the experts and the operation is stable till now clarifies the rationality of the analysis results. The fact that a variety of experiments and applications of the satellite communication system designed according to the findings in this paper have been successfully carried out confirms the correctness of the study results.
收录类别	SCI
语种	英语
WOS记录号	WOS:000264106800013
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7577]
专题	国家天文台_应用天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.China Telecommun Broadcast Satellite Co, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Cui JunXia,Shi HuLi,Chen JiBin,et al. The transmission link of CAPS navigation and communication system[J]. SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY,2009,52(3):402-411.
APA	Cui JunXia,Shi HuLi,Chen JiBin,&Pei Jun.(2009).The transmission link of CAPS navigation and communication system.SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY,52(3),402-411.
MLA	Cui JunXia,et al."The transmission link of CAPS navigation and communication system".SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY 52.3(2009):402-411.