The Method Research And Software Realization Of GNSS Multiple System Relative Positioning

GNSS technology development,in order to improve the positioning accuracy to open up new areas,multi-frequency multi-system GNSS combination of applications will become GNSS navigation and positioning of one of the main trends.Multi-system combination positioning can not only greatly increase the number of available satellites,and can improve the satellite space geometry,improve the positioning accuracy and stability.Based on the GNSS multi-system baseline data processing theory,this paper studies the linear combination of observations of GNSS multi-system combination,data preprocessing,GNSS multi-system data combination function model,stochastic model and fixed integer ambiguity,And then use the measured data for experimental verification and analysis,and finally developed a multi-system short baseline solution software.The main contents of this paper:Firstly,this paper summarizes the research status of GNSS multi-system combination positioning both at home and abroad.Based on the theory of GNSS multi-system combination of baseline data processing and GNSS multi-system combination of time and space unified theory,the GNSS multi-system function model and random model formula was deduced.Secondly,this paper analyzes the carrier double differential positioning results of the equal weight method,the prioritization method and the Hull model.It is proved that the Hull model is better than the prioritization method,in this paper,the influence of different heights on the positioning accuracy is studied.It is deduced that with the increase of the height cutoff angle,the positioning accuracy is also changing constantly,and the positioning accuracy is not increased with the increase of available satellites.GPS/BDS/GLONASS single system and different combinations of baseline residuals,the results show that GPS/BDS positioning accuracy is optimal,single GPS and GLONASS positioning accuracy and better than BDS,but the stability of the three systems is better than that of the dual system.The stability of the dual system is better than that of the single system.Finally,through the research and algorithm implementation of GNSS multi-system baseline algorithm,a set of GNSS multi-system combination short baseline solution processing software is developed and verified by short baseline data,which shows the correctness and practicability of this software.