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Barometric altimetry system as virtual constellation applied in CAPS
Al GuoXiang1; Sheng PeiXuan2; Du JinLin2; Zheng YongGuang2; Cai XianDe; Wu HaiTao3; Hu YongHui3; Hua Yu3; Li XiaoHui3
AbstractThis work describes the barometric altimetry as virtual constellation applied to the Chinese Area Positioning System (CAPS), which uses the transponders of communication satellites to transfer navigation messages to users. Barometric altimetry depends on the relationship of air pressure varying with altitude in the Earth's atmosphere. Once the air pressure at a location is measured the site altitude can be found. This method is able to enhance and improve the availability of three-dimensional positioning. The difficulty is that the relation between barometric pressure and altitude is variable in different areas and under various weather conditions. Hence, in order to obtain higher accuracy, we need to acquire the real-time air pressure corresponding to an altimetric region's reference height. On the other hand, the altimetry method will be applied to satellite navigation system, but the greatest difficulty lies in how to get the real-time air pressure value at the reference height in the broad areas overlaid by satellite navigation. We propose an innovational method to solve this problem. It is to collect the real-time air pressures and temperatures of the 1860 known-altitude weather observatories over China and around via satellite communication and to carry out time extrapolation forecast uniformly. To reduce data quantity, we first partition the data and encode them and then broadcast these information via navigation message to CAPS users' receivers. Upon the interpolations being done in receivers, the reference air pressure and temperature at the receiver's nearby place is derived. Lastly, combing with the receiver-observed real air pressure and temperature, the site's altitude can be determined. The work is presented in the following aspects: the calculation principle, formulae, data collection, encoding, prediction, interpolation method, navigation message transmission together with errors causes and analyses. The advantages and shortcomings of the technique are discussed at the end.
KeywordCaps System Navigation And Positioning Barometric Altimetry Bound Solution
Indexed BySCI
WOS IDWOS:000264106800010
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Peking Univ, Sch Phys, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China
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GB/T 7714
Al GuoXiang,Sheng PeiXuan,Du JinLin,et al. Barometric altimetry system as virtual constellation applied in CAPS[J]. SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY,2009,52(3):376-383.
APA Al GuoXiang.,Sheng PeiXuan.,Du JinLin.,Zheng YongGuang.,Cai XianDe.,...&Li XiaoHui.(2009).Barometric altimetry system as virtual constellation applied in CAPS.SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY,52(3),376-383.
MLA Al GuoXiang,et al."Barometric altimetry system as virtual constellation applied in CAPS".SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY 52.3(2009):376-383.
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