Development Of Specialized Testing Equipment For Time Information In Satellite Navigation

GNSS(Global Navigation Satellite System)is a space-based radio navigation and positioning system that provides all-day,high-precision positioning,navigation and timing services to a wide range of users on or near the Earth's surface.The specialized testing equipment for time information integrates a high-precision timing receiver,which can measure the time information accuracy of the carrier or the flight controller,and realize the high-precision timing to the satellite guide.The equipment is part of the development of the Beidou satellite navigation terminal.Therefore,the development of specialized testing equipment for time information in satellite navigation has important practical value.Based on the review of the current research status of testing equipments in satellite navigation at home and abroad,the basic principles and methods of timing technology in the Beidou satellite navigation system are researched,and the development of the specialized testing equipment for time information in satellite navigation is completed.The main work is as follows:1.The hardware scheme of the specialized testing equipment for time information in satellite navigation is proposed.The basic design principles of high-precision timing receiver and the implementation process of its modules are given.A hardware scheme based on dual-timing receivers to improve the special testing equipment is proposed.The stability of Beidou time service and the space utilization of the special testing equipment is improved.2.The software design scheme of the specialized testing equipment for time information in satellite navigation is proposed.According to the working principle of the receiver B,the software development of the 24ms interrupt,carrier interrupt,timing-offset interrupt and flight controller interrupt of the receiver B is carried out,and the function timing between the two receivers,the function extracting the time information of the carrier or the flight controller and the function timing the missile are realized.3.The hardware circuit board,capture and tracking sensitivity,and second pulse signal performance of the receiver A are tested.The test results show that the performance index of receiver A meets the overall design requirements.The hardware circuit board,the function timing between the two receivers,the function extracting the time information of the carrier or the flight controller and the function timing the missile are tested.The test results show that the function timing between the two receivers,the function extracting the time information of the carrier or the flight controller and the function timing the missile of the receiver A meet the overall design requirements.The module for calculating the time accuracy and the module for setting the timing offset of the upper computer software are tested.The test results show that the function calculating the time accuracy of the carrier or the flight controller,the function setting the timing offset and the function displaying time information of the upper computer software meet the overall design requirements.