摘要
本文介绍了某型号陀螺检测系统的核心部分即基于PCI总线的脉冲计数板的设计.陀螺检测系统能够测量陀螺上电2 s内的点火次数和每次点火的时间,在2.8~2.9 s间连续测量陀螺6路输出脉冲每1 ms时间段内的个数,在2.9 s后以4 ms为时间段连续采集陀螺的输出脉冲.脉冲计数板用2个计数器轮流采集1路输出脉冲,当一个计数器计数达4 ms时,停止计数,马上切换为另一个计数器进行计数,两个计数器交替计数,这样既保证了采集的准确性,也兼顾了测量的连续性.脉冲计数板用可编程逻辑器件构建计时器、形成计数器的门控信号以及其他控制逻辑,并每4 ms向PCI总线发送一次中断请求.该脉冲计数板测量频率的范围从0.01 Hz^1.6 MHz.
A PCI counting Board as the key part of the testing system for gyro, which is applied to counting the output pulses of laser or fiber optic gyro,is introduced in the paper. According to the demand for design, the system measures the triggering times for starting up the gyro and each exact triggering time in 2 s after electrifying. Then referring to the practical work state of gyro, the system continuously measures the sums of the 6 road outputting pulses of the gyro of every 1ms timesilce from 2.8 s to 2.9 s and of every 4ms timesilce after 2.9 s. The PCI counting Board uses two 16-bits Counters to alternately count the one road output pulses of the gyro. When the counting time of a counter reaches 4 ms, the counter immediately stops counting and the other starts to count and so forth. Thus the continuity and precision can be achieved. The PCI counting board constructs the Timer and generates the Gate Signals for 12 Counters and continuously sends interrupt requests to PCI Bus every 4 ms with CPLD. The basic framework and the key technique of the circuit of the PCI counting Board, the inner logic circuit of CPLD and the work process of the computer software for computer to control and visit the PCI counting board are particularly presented. The new PCI counting Board is designed to substitute the old ISA counting Board that was produced in Russia and cannot exactly measure outputting pulses of the new fiber optic gyro and cannot availably work in high-speed rotating test. The total system can precisely measure 0.01 Hz to 1.6 MHz pulses.
出处
《西安工业学院学报》
2005年第3期223-226,231,共5页
Journal of Xi'an Institute of Technology
