Design And Implementation Of Local Observation Quality Modeling Software For Satellite Positioning

With the development and application of satellite navigation system,satellite positioning technology has been widely used in auto-driving,smart network automobile,collaborative intelligent transportation system and other fields.It has important significance to ensure the safety and efficiency of vehicles and the entire transportation system.Vehicles may face more complex terrain environment in the actual driving process.How to accurately describe the satellite signal observation quality is of great significance to improve the vehicle satellite positioning performance,integrity monitoring,accurate monitoring and troubleshooting observation information.This paper analyzes the characteristics of satellite observation in local environment,studies the method of grid division in space-time domain in local environment,constructs the local quality modeling framework of satellite positioning based on space-time domain grid,puts forward the autonomous integrity monitoring method of vehicle satellite positioning based on local model assistance,designs and develops the quality modeling software of satellite positioning local observation.Based on the actual data,the grid model of satellite localization observation quality in time and space domain is realized,and the test and application of the model are realized in combination with the actual experiment and simulation,which provides an effective way to solve the optimization of satellite localization autonomous integrity monitoring performance in complex operation environment.The core work in this paper includes:1)Based on the modeling and application requirements of local observation quality of satellite positioning,the software design of local observation quality modeling of satellite positioning is completed,and the structure and function of software module are analyzed in detail;2)According to the characteristics of local observation quality modeling of satellite positioning,the strategy of grid division of space-time domain for local environment is studied,the method of modeling observation quality based on grid equivalent variance is proposed,and a complete modeling framework of space-time grid navigation satellite signal observation quality is constructed;3)Using the grid model of observation quality in space-time domain,a weighted autonomous integrity monitoring algorithm based on model assistance is designed,and the observation weighting strategy adopted by the conventional integrity monitoring algorithm is optimized;4)Based on the research of software design method and core algorithm,the establishment of local observation quality modeling software of satellites positioning is completed,the actual acquisition experiment is carried out by using the actual satellite positioning terminal,and the test data set is selected to verify the function of satellite localization observation quality modeling software and its performance for autonomous integrity monitoring.In this paper,using the developed software of satellite localization observation quality modeling to realize the automatic segmentation and combination of navigation satellite observation datasets in different space-time domain division modes,and then build a grid satellite localization observation quality model based on it.The corresponding modeling results can directly provide observation quality indication information for autonomous integrity monitoring algorithm,and optimize autonomous integrity monitoring compared with the traditional receiver autonomous integrity monitoring algorithm,the usability discrimination and fault detection can achieve better fault detection performance.The results of this paper can help to improve the adaptability of the vehicle satellite positioning autonomous integrity monitoring algorithm to the complex and changeable satellite signal observation environment.It is of great significance to improve the vehicle positioning accuracy and further ensure the autonomous fault tolerance ability of satellite positioning.It has clear application value in many applications with specific requirements for positioning credibility and safety.