基于MSP430与FPGA的高授时精度时码终端系统设计

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。

Designed for High Precise Time-code Terminal System Based on MSP430 and FPGA

High accurate time and frequency signals are the bases of obtaining exact datum,accurate real-time measurement and the control of flying objects.In order to demodulate the AC/DC code of the IRIG-B,the time synchronization and precise time are realized.According to MSP430 system and FPGA electric circuit in which the time-code terminal system design,the demodulation to IRIG-B code,GPS/GLONASS and Beidou time information are realized,The system has the function of inner time keeping and identificate error code,and can be bringout all kinds of frequency synchronous signals.The precision and the stability of the system are improved through adjusting voltage automatic use digital potentiometer to tame crystal oscillator.The synchronous precision can be improved to 100ns.