Ajax GIS Application for GNSS Availability Simulation

This paper describes an Ajax (Asynchronous JavaScript and XML) GIS (geographic information system) application for the simulation of GNSS (Global Navigation Satellite System) availability in dense urban areas. In the forthcoming GNSS environment, satellite visibility will be greatly increased owing...

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Vydáno v:KSCE Journal of Civil Engineering Ročník 11; číslo 6; s. 303 - 310
Hlavní autoři: Lee, Yang-Won, Suh, Yongcheol, Shibasaki, Ryosuke
Médium: Journal Article
Jazyk:angličtina
Vydáno: Seoul 대한토목학회 01.11.2007
Springer Nature B.V
Témata:
Applications programs
Availability
Canyons
Data transfer (computers)
Dilution
Geographic information systems
Geographical information systems
Global navigation satellite system
Global positioning systems
GPS
Information systems
Navigation
Navigational satellites
Positioning systems
Remote sensing
Satellite systems
Satellites
Simulation
Skyscrapers
Street canyons
Urban areas
GNSS(Global Navigation Satellite System)
Web GIS(Geographic Information System)
Ajax(Asynchronous Javascript and XML)
ISSN:1226-7988, 1976-3808
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Shrnutí:This paper describes an Ajax (Asynchronous JavaScript and XML) GIS (geographic information system) application for the simulation of GNSS (Global Navigation Satellite System) availability in dense urban areas. In the forthcoming GNSS environment, satellite visibility will be greatly increased owing to the integration of multiple GNSSs such as the American GPS (Global Positioning System), the Russian GLONASS (Global Navigation Satellite System), the European Union’s GALILEO, and the Japanese QZSS (Quasi-Zenith Satellite System). However, in dense urban areas, the improvements of position accuracy may be limited because obstruction of the signal by high buildings results in bad geometries and multipath effects. To evaluate the spatiotemporally varying availability of GNSS positioning, we built an estimation model that computes the number of visible satellites, the values of DOP (dilution of position), and the amount of multipath errors, according to the location and time of a user. Then, the GNSS availability components were visualized in an Ajax-based Web application that provides a desktop-like interactiveness through the asynchronous data transfer between client and server. This Web simulation shows when and where the navigation services by integrated GNSS are available or appropriate in urban canyons. As a feasibility test, we demonstrated an experimental simulation for the Shinjuku ward of Tokyo filled with skyscrapers.
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ISSN:1226-7988
1976-3808
DOI:10.1007/bf02885901