Simulating the Differential Positioning Mode Using One GPS Receiver
Journal of Civil, Construction and Environmental Engineering
Volume 2, Issue 2, April 2017, Pages: 78-86
Received: Mar. 10, 2017; Accepted: Mar. 21, 2017; Published: Apr. 14, 2017
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Ahmed Abobakr Elashiry, Faculty of Engineering, Beni-Suef University, Beni-Suef, Egypt
Abdel Hameid M. Abdel Hameid, Faculty of Engineering, Beni-Suef University, Beni-Suef, Egypt
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This research tends to raise the accuracy of absolute point positioning by simulating the differential positioning mode. This process was done by observing the unknown point using one unit GPS receiver after observing the fixed point with the same receiver and estimate the Doppler value; where it equals to the expected change at carrier phase measurement from two adjacent epochs, to determine the phase value in the following epoch and generate new observation file for the known point has phase observation at the same period of observing the unknown point. The generated data at the known point will be solved with the observed phase data at the unknown point for four satellites at least using triple difference technique to vanish the ambiguity value and all affecting errors on observations. Finally the least square technique will be applying on the resulted equations from the previous process. This method had been enhanced to improve the positioning accuracy from ten meters to 30 cm as a maximum error in 3D coordinates. In condition that there is one fixed point at least in the observation area, and the interval period between observing the fixed and unknown point is less than 15 min.
GPS, Absolute Point Positioning, Phase Measurements, Doppler Estimations
To cite this article
Ahmed Abobakr Elashiry, Abdel Hameid M. Abdel Hameid, Simulating the Differential Positioning Mode Using One GPS Receiver, Journal of Civil, Construction and Environmental Engineering. Vol. 2, No. 2, 2017, pp. 78-86. doi: 10.11648/j.jccee.20170202.15
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