Real Time Internet DGPS Service

Soares, Manuel Gonçalves; Malheiro, Benedita; Restivo, Francisco José de Oliveira

http://hdl.handle.net/10400.22/5135

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Authors

Soares, Manuel Gonçalves

Malheiro, Benedita

Restivo, Francisco José de Oliveira

Abstract(s)

The accuracy of the Navigation Satellite Timing and Ranging (NAVSTAR) Global Positioning System (GPS) measurements is insufficient for many outdoor navigation tasks. As a result, in the late nineties, a new methodology – the Differential GPS (DGPS) – was developed. The differential approach is based on the calculation and dissemination of the range errors of the GPS satellites received. GPS/DGPS receivers correlate the broadcasted GPS data with the DGPS corrections, granting users increased accuracy. DGPS data can be disseminated using terrestrial radio beacons, satellites and, more recently, the Internet. Our goal is to provide mobile platforms within our campus with DGPS data for precise outdoor navigation. To achieve this objective, we designed and implemented a three-tier client/server distributed system that establishes Internet links with remote DGPS sources and performs campus-wide dissemination of the obtained data. The Internet links are established between data servers connected to remote DGPS sources and the client, which is the data input module of the campus-wide DGPS data provider. The campus DGPS data provider allows the establishment of both Intranet and wireless links within the campus. This distributed system is expected to provide adequate support for accurate (submetric) outdoor navigation tasks.

Keywords

Differential GPS Internet and Distributed Systems

URI

http://hdl.handle.net/10400.22/5135

Citation

Manuel Gonçalves Soares; Benedita Malheiro; Francisco José de Oliveira Restivo. Real Time Internet DGPS Service, Trabalho apresentado em 7th World Multiconference on Systemics, Cybernetics and Informatics, In Proceedings of the 7th World Multiconference on Systemics, Cybernetics and Informatics (SCI’2003), Orlando, 2003.