【摘要】 从本质上看IRIG-B码的码流结构是一种脉宽调制码,其未经调制的信号为每秒100个2ms的码元,信息位是由固定位的脉冲宽度表示的。将B码的每秒1000bit的码流信号反相,恰好对应1个异步串行码结构。把B码当成数据帧来接收,利用了UART的抽样差别能力、帧同步确立、帧同步保护等技术,提出了一种基于异步串口的B码解调方法,实验证明该方案能大大提高解码的可靠性。更多还原

【Abstract】 The IRIG-B code is essentially a modulating code for width of pulse with the unmodulated signal being 100 bits of 2-ms code per second, and its information bits are expressed as the width of pulse. The reversed B-code signals with the code flow of 1 000 bits per second just correspond to the structure of an asynchronous serial code. A demodulating B-code solution with the asynchronous serial port controller—UART is introduced in which the B-code is received on data frames, and such techniques as the sampling sense of UART and the establishment and protection techniques of the synchronous frame are adopted. It is proved by experiment that the reliability of demodulation can be improved greatly by using the presented solution.更多还原