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高准确度的时间信息和同步频率信号是获取准确数据、实时精确测量和制导控制飞行目标的基础。为了解调IRIG-B交流码和直流码,实现全系统时间同步和精确授时,通过基于MSP430单片机和FPGA的时统终端系统的设计,实现了对IRIG-B码、GPS、GLONASS和北斗时间信息的解调,系统具有内设频标的守时功能和误码识别功能,同时提供各种不同频率的同步信号。通过采用数字电位计自动调节电压的方式进行晶振驯服,提高了晶振的准确度,减小了老化和频率漂移对频率准确度的影响,系统外同步精度可达到100ns。
High-accuracy time information and synchronized frequency signals are the basis for accurate data acquisition, accurate real-time measurement and guidance control of flight targets. In order to demodulate IRIG-B AC code and DC code to achieve system-wide time synchronization and accurate timing, IRIG-B code, GPS, GLONASS and BeiDou time information are realized through the design of the system time terminal system based on MSP430 MCU and FPGA Demodulation, the system has built-in frequency punctuality function and error code recognition, while providing a variety of different frequency synchronization signal. By adopting a digital potentiometer to adjust the voltage automatically, the crystal is tamed to improve the accuracy of the crystal oscillator and reduce the influence of aging and frequency drift on the frequency accuracy. The system external synchronization accuracy can reach 100ns.