Comparative Analysis Of Stability And Accuracy Of GNSS Multi-star Positioning Data

As the latest research results in twentieth Century,the global navigation satellite system has been used in all fields of social life.In recent years,many countries and regions of the world in satellite navigation system research are largely invested in China for example,the second batch of Beidou navigation positioning system and the European Galileo system are relatively high level of modernization The global navigation satellite system has developed into a state of multiple systems and multiple frequencies simultaneously,which brings great challenge to the current GNSS data processing methods.At the same time,multi frequency service is in recent years began to rise and develop,so many aspects of technology and ideas are not mature,still in a primary stage of development.In the past only two frequencies,due to the impact of clock parameters,frequency compatibility cannot be applied directly to the analysis,but when there are three or more frequency,clock parameters cannot completely eliminate the deviation between the frequency,therefore under multi frequency,the frequency of compatibility between analysis must be carried out,which is more frequency data processing work before.Secondly,in order to make full use of the advantages of the system,and make the fused data to get more stable and reliable results,the stability and precision of the satellite system data are analyzed in detail in this paper.The main work of this paper is:(1)to the data processing model of the existing global positioning system and multi system and multi frequency GNSS are summarized;the use of Rinex3.02,then the functions and usage of TEQC are introduced,finally the data quality index:the calculation method of ionospheric effects,signal-to-noise ratio,data integrity,week jump ratio and multipath effect etc.are described.(2)the related experiments are carried out,and the dual frequency and dual frequency data are processed in the same time and the same place.The experimental results show that the horizontal direction of the real-time dynamic data,Samsung dual frequency data accuracy is slightly better than that of binary frequency data in the vertical direction;but on the contrary,it is slightly worse than the Samsung dual frequency data binary frequency data.(3)the relevant experiments are designed,and the receivers of the same type are selected,and the data are collected at the same place,the same time and the same observation condition.Then the multistar static data collected decomposition,the preliminary conclusion of Beidou satellite navigation system Chinese received data stability and quality(due to GNSS positioning is affected by the three part of the error,the first part is all GNSS receivers are some,such as satellite clock error,ephemeris error,ionosphere error,troposphere error;the second part is spread delay error;the third part is the inherent error,all GNSS receiver such as channel delay,multipath effect,internal noise etc..In this paper,the stability and quality of the data received by Samsung and binary stars are measured in the first part,and the accuracy is measured by three parts Best,followed by the U.S.GPS satellite navigation system,and finally the Russian GLONASS satellite navigation system.However,due to the geographical limitations of the data source(only the data of Yunnan,Wenshan),there is no geographical comparison,it is not certain that in other regions,whether it is the result.(4)data processing method using the original observations are discussed for different frequency compatibility between GPS,the experimental results show that the residual GPSL5 is about three times the L1/L2 residuals,and the number of days in the continuous variation and variation trend are basically the same,which means that the system may contain some L5 deviation GPS and L1/L2 compatible.