Shooting Range Time System Designed With FPGA

This thesis mainly deals with the theory and practice of modern shooting range time system. We investigated some pivotal technique about shooting range time system designed with Field Programmable Gates Array (FPGA) technique, which is referred to IRIG-B code (B type format of USA shooting range instrument group) time system. Details on the design of both hardware and software are given from the engineering aspect.Time system equipments are important in modern spaceflight test shooting range and normal weapon test shooting range, which send standard time signal and standard frequency signal to test equipments such as missiles, secondary planets and airships. High accurate time and frequency signal are the bases of obtaining exact datum, accurate real-time measurement and the control of flying objects. With the development of space technique, the more information needed by the control equipments of test shooting range, the higher requirement to standard time system equipments. IRIG-B time code (B code) becomes the suitable standard code for time system equipments because of its superior capacity, simple and easy realization and use. IRIG-B code time system is used for time information transfer and time synchronization between different ranges in the shooting range system. However, IRIG-B code time system equipments designed with ordinary separate components have some shortcomings: complex circuit, low integration, hard to debug, large shape, high cost and low technical secrecy. In order to solve those problems, we put forward a way to develop a new generation of IRIG-B code time system equipments, which is to integrate hard circuit with FPGA technique. We designed the hardware with the device of Altera Company and the system control software with assembly language.In the engineering practice, the design of FPGA is in a hiberarchy way which is to modularize complex circuit from bottom to top and finally to create a top module.We adopted 051 microprocessor in the part of system control and realized the design of IRIG-B code time system's hardware and software under the control of software. Therefore, software flow charts of 051 microprocessor are also introduced.The parts of IRIG-B code time system equipments presented in this thesis are as follows:1. IRIG-B code generator;2. 1KHz sine wave signal digital synthesizer;3. IRIG-B code demodulator;4. Digital Phase Shifting Frequency Clock; Their functions are as follows:Demodulate the information of day, hour, minute and second, and show those information through LCD;Generate local Ipps signal by dividing standard frequency generated by the extern referent frequency or inner quartz shake;Generate standard time signal with the time synchronization to extern Ipps signal or demodulated Ipps signal;Make local time's phase exceed or lag;Generate 1KHz sine wave signal;Generate IRIG-B (DC) code and IRIG-B (AC) code.The result indicates that IRIG-B code time system equipments designed with FPGA have overcome original time system equipments' shortcomings and have some strongpoints: high reliability, high secrecy, easy to debug, high automation, low cost and comprehensive practical application.