Design Of Mulitifunctional Timing Terminal Base On Beidou And GPS

Time and frequency are very important parameters of national defense scientific research test measurement system.The timing system of the test site requires the uniform,standardized time and frequency information for the testing and control equipment in scientific research experiments,and also provides signals such as time stamps at important moments.At present,the main timing method used in most domestic test sites is still GPS satellite timing.And in recent years,Beidou satellite navigation system developed by our country has made rapid development,and its application field has been continuously expanded.Considering the safety and reliability of the national defense research,and considering some shortcomings of the original time system equipment in the actual work,this paper studies the design of a time-based terminal using dual-mode timing and integrating multiple functions.Firstly,this paper introduces the basic structure of timing system in the test site.It also expounds the current main types of time service and the current situation of technology development,and makes a related research and analysis on the principle of Beidou and satellite timing systems.Through the comparison of several kinds of timing technology,this paper adopts Beidou and GPS dual mode timing technology,and puts forward the overall scheme design of the system with microprocessor and programmable logic device as the core processing module.Then this paper elaborates its concrete design idea in detail around the system each module realization function?It mainly includes the hardware selection,the circuit design and the software design and so on.The peripheral hardware circuit of the core processing module and the design of the main program of the microprocessor are described in detail.The design principle of the BDC code generation module is analyzed and the realization method of the programmable logic device and the microprocessor program is given.Finally,the functions and indexes of the system are tested.From the test results,the functions of the multifunctional terminal equipment designed in this paper meet the overall design requirements,the synchronization error of the output BDC code is better than 11 ns,and each index is superior to the overall design index.The multifunctional time system terminal equipment based on Beidou and GPS designed in this paper has high system integration,small volume and low power consumption.It adopts the structure of microprocessor and programmable logic device to work together,which not only improves the processing efficiency of the system,but also improves the processingefficiency of the system.And the overall design of the system has a great deal of flexibility.The device has been used in practice.