Wednesday 24 August 2005

G7
1100-1230 hours

254
GPS performance in a scintillation environment at Hong Kong
Chen, Wu¹, Gao, Shan¹, Ding, XiaoLi¹, Chen, Yongqi¹
1 Department Of And Surveying And Geoinformatics, Hong Kong Polytechnic University, Hong Kong
Author email: lswuchen@polyu.edu.hk
Hong Kong is located at geographic latitude of 22 degrees (geomagnetic latitude 11 degrees) where is in an ionosphere active band. In 2001, ionosphere disturbances have been recorded by GPS observation in 133 days, when the sunspots reached to the peak of its eleven-year cycle. This paper presents the spatial and temporal distribution of ionosphere disturbances in Hong Kong, based three-year (2001-2003) GPS observation. It was found that the ionospheric scintillation has seasonal changes, reaching to the maximum around March and September. Also, strong ionospheric scintillations occurred mostly around 22 degrees latitude. GPS receiver performance during the scintillation periods was analysed. Particularly, statistical data on loss of locks and measurement errors of GPS receivers were studied. The performance of different type of GPS receivers during scintillation periods was also compared in this paper.

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