基于MSP430＋FPGA的IRIG-B码时统设计

Design of IRIG-B Code System Based on MSP430+FPGA

MSP430系列单片机是集成度高、超低功耗的16位单片机。Cyclone系列芯片是Altera公司推出的低价格、RAM可达288 kb的高容量的FPGA。IRIG-B码广泛应用于靶场时间信息的传递和各系统的时间同步。详细介绍了IRIG-B码解码电路和调制电路的硬件设计。MSP430的软件采用C语言编写,使程序有很强的可移植性。

The MSP430 is a 16-bit RISC CPU with high integration degree, flexible clock system and ultralow power consumption. Cyclone series is a FPGA from Altera, which has low cost, and large capacity（288 kb）. IRIG-B code is one of the standard time code formats, used for time information transfer and time synchronization between different ranges in the shooting range system. The theory and method of digital demodulating technique are presented particularly. C language is adopted to carry out software design, which makes program much transplantable. The results demonstrate that the system runs steadily, has high synchronization precision and better anti-interference ability.