基于LabVIEW的IRIG-B码实时采集与解析方法

授时设备是现代舰船噪声综合测试系统的重要组成部分.本文提出一种LabVIEW平台下的授时设备IRIG-B码采集解析方法.首先利用授时设备产生的秒脉冲作为触发信号控制采集设备采集IRIG-B码,然后对IRIG-B码进行门限判别预处理,再与位置识别标志比对提取信号端点,最后将IRIG-B码与移位寄存器进行移位比对,识别码字以及解析时间信息.试验结果表明,该方法能够有效解决IRIG-B码实时采集解析问题,具有定时精度高、软件开销小、抗电磁干扰能力强等优点,可应用于授时设备的开发设计、工作状态监测、信号质量评估等.

Real-time acquisition and decoding of IRIG-B code based on LabVIEW

Timing device plays an important role in modern comprehensive test system of ship noise measurement. A novel method of IRIG-B code acquisition and decoding based on LabVIEW is proposed. Firstly, using the pulse signalpro-duced by timing equipment to control DAQ equipment. Then a threshold is introduced to the calculation of the starting points detection. Finally, the time information can be resolved by compare the IRIG-B code with shift register. Experimental results demonstrate that the proposed method is feasible to save the real-time acquisition and decoding of IRIG-B code, andespe-cially it has a number of advantages, such as effectively improve the timing precision, decrease the software expense and overcome the electromagnetic interference. The proposed method possesses a prospective application in the area of timing device application system development, operating state monitoring, signal quality evaluation etc.