BDS/GPS Integrated Timing Technology Research And Application

Timing system,which is an important part of TT&C(telemetry,track and control)system,is the key equipment of modern launch site and range test.It can provide a variety of synchronizing signals and accurate time scale for TT&C equipment.With the rapid development of deep space exploration,manned spaceflight,space station construction,lunar exploration program and range weapon test,higher requirements to the accuracy,reliability,volume and function are put forward.At present,timing system client of vehicle TT&C equipment in the range and launch site mostly uses B code timing which has relatively strong dependence.B code must depend on central timing system,while GPS timing must depend on the global positioning system of U.S..With the steady progress of the construction of our country's Beidou navigation and positioning system,which can make the timing source not only rely on the GPS of U.S.,solid foundation is laid for the self-control of key technology.With BDS timming,GPS timing and B code timing,comprehensive timing system based on FPGA has been designed and developed in this paper.The test showed that the synchronization precision of the comprehensive timing system is less than 0.5us,which is better than the current 1us.The system meets the requirements of small size,high precision and self-control.Starting with composition of timing system and research situation home and abroad,this paper has studied the basic principle and composition of BDS,GPS and B code,and analyzed the overall timing relationship,synchronous precision and timing accuracy.Decoding,coding and high-precision time keeping have been mainly studied.Comprehensive timing system has been designed and developed by FPGA.The method of realizing the key technology has been put forward from engineering technology,which has a wide range of applications in the measurement and control of space launch and weapon testing.