Authors
Malheiro, Benedita
Advisor(s)
Abstract(s)
In this paper we describe a low cost distributed
system intended to increase the positioning accuracy of outdoor
navigation systems based on the Global Positioning System
(GPS).
Since the accuracy of absolute GPS positioning is insufficient
for many outdoor navigation tasks, another GPS based
methodology – the Differential GPS (DGPS) – was developed in
the nineties. The differential or relative positioning approach is
based on the calculation and dissemination of the range errors of
the received GPS satellites. 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, first, establishes Internet links with
remote DGPS sources and, then, 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 outdoor navigation tasks.
Description
Keywords
Differential GPS Distributed systems Global Positioning
Citation
Manuel Gonçalves Soares; Benedita Malheiro. A Distributed System for the Dissemination of DGPS Data through the Internet, Trabalho apresentado em International Conference on Advances in Infrastructure for Electronic Business, Education, Science, Medicine and Mobile Technologies on the Internet, In Proceedings of the International Conference on Advances in Infrastructure for Electronic Business, Education, Science, Medicine and Mobile Technologies on the Internet (SSGRR’2003), L'Aquila, 2003.