Alireza.A. Ardalan Professor
Department of Surveying and Geomatics Eng., Center of Excellence in Geomatics Eng. and Disaster Management, University of Tehran, Iran,
Email: ard[email protected]
Department of Surveying and Geomatics Eng.
Center of Excellence in Geomatics Eng. and Disaster Management
University of Tehran
Email: [email protected]
Considering ever-increasing usage of GPS and necessity of achieving precise information, removing or reducing these errors is very important. Nowadays ionospheric error is the main obstacle of achieving high precisions. In this paper a method has been presented to model ionospheric error in absolute positioning by GPS receivers using analysis of coordinate time series created by GPS permanent stations observations. We have tried to estimate spatial range of operation of created models in each station using observations of several stations. The developed model is based on coordinate time series acquired from continuous observations at permanent GPS stations, and is used to predict the error at k time later using a simple recursive formula. The performance of the developed model is tested by prediction of ionospheric error at the times not used for modeling at the permanent GPS station and at other point at various distances to permanent GPS stations. Theoretical Details and the results of case studies are presented in the paper.The developed model and simulation results have been presented in the paper.