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Accuracy Analysis of Satellite Precise Point Positioning
Mehrnoosh Bakhtiari Far
M.Sc. Student
K.N. Toosi University of Technology,
Iran
Email: mehrnoosh_Bakhtiari@yahoo.com
High precision positioning with centimeter level accuracy can only be carried out by using differential GPS positioning method which require the deployment of base receiver stations. The requirement to deploy the base stations, however, spatially limits the operating range of the rover receiver to about 20 km from the base stations. As a result, it increases the operational costs of equipment, human resources, and the logistical complexity for many applications such as land geodetic surveying and vehicle tracking and mapping. With the increased availability of precise GPS satellite orbit and clock data in real-time from many organizations, high precision positioning at centimeters to decimeter level is now possible using a single GPS receiver.
Precise Point Positioning (PPP) can be used for a wide range of applications in geodetic positioning. Providing precise clock and orbit information, a single station can be positioned in a reference frame.
This paper presents processing results of applying a new precise point positioning method at static and kinematics mode. Analysis is conducted with repect to the positioning accuracy and convergence performance. The results have indicated an average positioning accuracy of 40 cm RMS vertically and less than 30 cm horizontally. An average of 3 hours is usually needed for the float position solution to converge to an accuracy of a few centimeters which points out the importance for the development of ambiguity resolution method for PPP processing.
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