Precise Real-Time Positioning in WADGPS Networks |
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Authors: | Günther Retscher C H Jason Chao |
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Institution: | (1) Department of Applied and Engineering Geodesy, Vienna University of Technology, Gusshausstrasse 27–29 E128/3, A-1040 Wien, Austria, AT;(2) Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, HK |
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Abstract: | In recent years the importance of real-time positioning and navigation with the Global Positioning System (GPS) has grown
rapidly. Starting from the establishment of differential GPS (DGPS) reference stations for marine and land navigation, new
users and applications have emerged that resulted in a high demand for the establishment of a high-density network of reference
stations around the world. Many countries have established their own DGPS service, which is either governmentally or commercially
owned. These services are referred to as Local Area DGPS Systems (LADGPS). However, the costs for the establishment and maintenance
of a dense network of reference stations are very high. Therefore Wide Area DGPS Systems (WADGPS) are being developed to overcome
the main drawbacks of LADGPS. In this case, only a few reference stations are used to cover a large area, such s a continent
like Europe. To achieve high positioning accuracies, real-time modeling of the main error sources for long-range baselines
is required as errors in the satellite orbit and ionospheric refraction do not cancel entirely in double differencing. In
this article, a real-time correction model based on the Kalman filter for WADGPS and networked LADGPS services is discussed
and results of field tests in a WADGPS network in Europe are presented. ? 2000 John Wiley & Sons, Inc. |
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