The accuracy analysis of web-based on-line GNSS processing services : a case study for Istanbul
Subasi, Harun Kenan & Reha Metin Alkan
The usage of GPS technology is increasing day by day. It is used in widely applications but the basic purpose of GPS is getting information about coordinates. The methodology and equipments are depends on accuracy that expected. For example the simple hand-held GPS receivers which are about 100 USD are enough for 3-5 meter accuracy but if better accuracy is needed, it is necessary to use geodetic type GPS receivers. Both used devices and process methods are alterable with expected accuracy. Positioning with GPS can be realized with two general operating methods: point positioning and differential (or relative) positioning. In relative (differential) positioning method, there must be at least one GPS set to collect data continuously on a known point and users must make sessions to unknown points with other GPS set. For these reason, at least two GPS receivers are needed. To process the collected GPS data, proper GPS post-processing software is also needed. Users paid both purchase and get training about the processing software. Besides, nonexperienced users spend too much time for process the GPS data on this software. Systems such as CORS, dedicate to overcome these kind of problems. However, when we can not connect or absence of these systems or need better accuracy, classical GPS processing software are still needed.
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