Real-Time Estimations And Its Analysis Results In Precise Satellite Clock Based On The IGU Ephemeris

Now,with the development of human civilization and science technology,measurement technology also has developed,especially the particularly rapid development of GPS and its application.Along with the newer and better technology,the global satellite navigation technology in many areas has been a well development.The emergence of precise point positioning technology promotes the development of GPS.Firstly,precise point positioning takes a advantage of precise satellite ephemeris and satellite clock information from the global IGS service center.Generally,the sampling interval of GPS receiver’s observation data is not the same with the external satellite orbit and clock products.Therefore,using a interpolation model can compute the desired orbit and clock information.Finally,the collected data can be processed.But the precise point positioning technology promotion has been impacted by the reason that precise satellite clock can not be real-time released. Satellite clock error and precision orbit must be determined in real-time for real-time precise point positioning.This is also a difficult and hot spot of precise point positioning.Therefore, the independent developed clock error software, which is based on the solution method of satellite relative clock error, has an important research value and significance for real-time precise point positioning.In this thesis,amaing at the theme-calculation of clock information,the real-time solution can be obtained by researching and analzsing, the differential model without ambiguity is selected by model analysis and comparision of several non-differential or differential method. Using the vb language,the method to achieve real-time satellite clock has been realized.Using the continuous-reference station and IGS stations’data,such as satellite orbit and clock,navigation files and so on.Ionosphere,troposphere,multipath,the rotation of the earth and phase center offset can be eliminated or weaken through a number of methoda and models.The experimental results show that using this method,the satellite clock can be calculated with precision of0.2ns to0.8ns,which is better than one ns and has the same accuracy level of IGS analysis centers.it can meet the high precise point positioning of satellite clock’s requirement and has the potential of real-time applications to a certain extent.This further illustrates the applicability and reliability of the method in this thesis.