CONVERGENT ANALYSIS OF REAL-TIME ESTIMATION OF SATELLITE CLOCK BIAS
Li Li 1,2) ; Zhu Jianjun 2) ;Chen Yongqi 2, 3) ; Kuang Cuilin 2) ; Long Sichun 1) ; and Li Hongyu 4)
1)Hunan Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection, Hunan University of Science and Technology , Xiangtan 411201;2)Department of Survey Engineering and Geomatics, Central South University, Changsha 410083;3)Department of Land Surveying and Geo-informatics, Hong Kong Polytechnic University, Hong Kong, China;4)College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University, Hohhot 010018
Abstract The effects of the station amount, observation time and station distribution on the estimated satellite clock biases were analyzed.The results show that,general speaking,the increment of station amount and observation time is conducive to improve the estimated accuracy of satellite clock bias. However, the increment of station amount will increase the timeassuming, in order to ensure the accuracy and the property of realtime, it is useful to select the appropriate station distribution and amounts, which are conducive to the real time estimation of satellite clock biases and their application.Realtime precise point positioning (PPP) tests show that, compared with the PPP positioning based on the IGS final precise clock, due to the effect of low precision of estimated clock bias in the initial phase, it makes the parameter convergence of PPP positioning require more time
