Research And Development Of GNSS Positioning Simulation Software

This project belongs to China’s "the Belt and Road" project,which is used for the cultivation and training of a "the Belt and Road" national cyber army.The main functions include constellation simulator,receiver simulator,and network communication.The main work of the paper includes:1)Functions such as satellite orbit simulation,single point positioning,carrier orbit simulation,error simulation,and fault simulation for GPS,GLONASS,and Galileo are implemented.2)The modular design scheme is adopted,including six modules,including constellation simulation,satellite and carrier trajectory simulation,atmospheric environment simulation,abnormality and fault simulation,simulation switch control,and information interaction.Using WPF framework to implement a web based interface;Establish channel channels in network communication to achieve data access;Realize constellation orbit simulation and generate navigation messages that are sent to the receiver simulator;Realize accurate navigation and positioning as well as positioning trajectory simulation;The simulation generation and elimination of GNSS positioning errors are realized.It provides a good technical route for the update and expansion of subsequent software functions.3)Relevant software interfaces have been designed and developed.The software interface uses charts to display the positioning simulation results,which can intuitively display the dynamic trajectory map of the constellation operation plane,three-dimensional positioning information of the receiver carrier,time information,position information after coordinate conversion,dynamic trajectory map of the carrier,signal to noise ratio,and changes in positioning information caused by navigation system errors.4)The data in the simulation process adopts the method of network communication,and the communication data frame structure and frame verification mechanism are designed to ensure the reliability of data interaction.Based on the basic principles of navigation,this paper implements the data interaction between constellation simulators and receiver simulators based on network communication,solves the conversion of channels from free space to network space,and completes the development of GNSS positioning simulation software.The system is developed strictly based on navigation satellite orbits,navigation signals,and satellite receivers,and has good academic value.As a systematic simulation platform,this software can provide a testing environment for universities or scientific research institutions,eliminating complex hardware problems.It can be used as an internal testing platform for navigation related enterprises,improving research and development efficiency,and promoting the popularization of knowledge related to GNSS navigation systems.