基于FPGA的某型导弹点火时间测量研究

Research on Fire Time Measurement of a Type of Missile Based on FPGA

在对某型导弹控制箱的性能参数进行检测时,点火时间的测量是一项重要的检测内容;点火时间的测量实质上就是对脉冲时间间隔进行测量;在对时间间隔测量方法研究的基础上,给出了FPGA设计方案,利用了FPGA内嵌锁相环的移相功能,实现了游标法测量时间间隔,从而使测量精度有了很大的提高;用QuartusⅡ软件对系统进行了仿真,仿真结果表明,系统测量误差在7.33ns以内,满足设计要求;同时对误差产生的原因进行了分析。

It is important to measure the fire time when checking the performance parameters of the control box of a type of missile. Measuring the fire time means to measure the pulse interval. A solution is provided through analyzing the methods of the pulse interval meas- urement using FPGA. The phase shifting function of the PLL inside FPGA is used to realize the pulse interval measurement based on caliper method and the measurement accuracy is improved. Quartus Ⅱ software is used to simulate. The results show that the error of the system is below 7.33ns. The reason of the error is also analyzed.