Universiti Teknologi Malaysia Institutional Repository

Discrepancies in GPS positioning during varying monsoon periods in Malaysia

M. H., Yahya and M. N., Kamarudin and Z., Nordin (2009) Discrepancies in GPS positioning during varying monsoon periods in Malaysia. In: 8th Annual Asian Conf & Exhibition on Geospatial Information, Technology & Applications (Map Asia 2009), 2009, Singapore International Convention & Exhibition Centre (SUNTEC).

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Abstract

The broad field of engineering presents vast opportunities among local practitioners to benefit from Global Positioning System (GPS) as an ingenious yet practical space- based technology in providing the critical positioning data needed for projects including large buildings, roads, bridges, sewers and tunnels. Offering a competitive advantage by increasing productivity when coordinating to existing topography or staking out design features on the ground, one of the key limitations of this multi- satellites system however is the latency in time of satellite-to- receiver signal arrival caused by the variablity of refractive indices within the Earth’s troposphere where all of weather changes and most climatic variations take place. As the weather condition in Malaysia is mainly characterized by two monsoon regimes: the Southwest Monsoon (from late May to September) and the Northeast Monsoon (from November to March) with two transition periods (from April to early May and September to October) that contributes spatial and temporal variations of the tropospheric refractive indices each year, the resulting decrease in velocity increases the time taken for the signal to reach a receiver’s antenna, thereby increasing the equivalent path length, which in turn affects the accuracy of the derived positions. This paper aims to investigate the impact of varying monsoon periods on the performance of three dimensional vectors of GPS derived positions. Series of comprehensive analyses were conducted based on GPS data retrieved from five continuously operating reference stations forming parts of the Malaysian Real-Time Kinematic GPS Network (MyRTKnet). The result reveals that the latency in the satellite-to-receiver signal propagation caused by the varying refractivity of the local troposphere during varying monsoon periods in Malaysia leads to significant variations of about 64 percent accuracy degradation in GPS positioning performance. Without appropriate compensation, the performance of GPS positioning is a matter of concern for high precision applications where the utmost possible accuracy is highly demanded.

Item Type:Conference or Workshop Item (Paper)
Subjects:G Geography. Anthropology. Recreation > G Geography (General)
T Technology > T Technology (General)
Divisions:Geoinformation Science And Engineering (Formerly known)
ID Code:15072
Deposited By: Liza Porijo
Deposited On:19 Sep 2011 09:29
Last Modified:19 Sep 2011 09:29

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