A New Klobuchar Model and Its Precision Analysis for Beidou Navigation Satellite System
1 Key Laboratory of Technology and Application of Precise Navigation, Guilin University of Electronic Technology,
1 Jinji Road, Guilin 541004, China
2 Faculty of Computer Science and Engineering, Guilin University of Electronic Technology, 1 Jinji Road, Guilin 541004, China
Abstract：〗Ionospheric delay is the main error of satellite measurement. As the precision of the traditional Klobuchar model is not high, this paper presents a new Klobuchar model that is designed to improve the precision of Beidou satellite navigation systems. We use a GIM model for CODE as a reference and a relax iterative search method to 〖JP2〗conduct case analysis, including the China region’s grid points and the observed data from nine stations. By comparing the two models, we find that the new model has a higher correction rate with respect to the broadcast model. Moreover, using the new model to forecast ionospheric delay within one week also has a better correction effect than the broadcast model. Statistical data further shows that the average correction precision improvement on grid points is from 67.89% to 78.44%, and the observed data of different stations from 69.81% to 82.34%.
XU Libing,CAI Chenglin,CHEN Guangxi et al. A New Klobuchar Model and Its Precision Analysis for Beidou Navigation Satellite System[J]. jgg, 2015, 35(5): 788-792.
