基于FPGA的光纤振动定位系统的设计与实现

Design and implementation of fiber-optic vibration positioning system based on FPGA

针对防区周界被入侵时无法实时定位报警的问题,设计并实现了一种可实时定位的分布式光纤振动定位系统。以马赫-曾德尔光纤干涉技术为基础搭建光路,采用以FPGA结合高速ADC的硬件平台,对光路传来的两路信号进行转换、采集,并以互相关为主要算法处理采集信号得到振动位置。在一段160 m的光路上进行试验,系统能在振动发生后500 ms内给出振动位置。设置采样率为10 MHz,经过多次定位测试得出系统实际的定位误差为±10 m。且定位不需要上位机,提高了装置便携性,降低了成本。

Aiming at the problem that the perimeter of defense zone can’t be located in real time when it is invaded,this paper designed and realized a real-time distributed optical fiber vibration positioning system.The optical path was built on the basis of Mach-Zehnder fiber interference technique,FPGA combined with high speed ADC was used as hardware platform to transform and collect the two signals from the optical path,then the cross correlation was taken as the main algorithm to process the acquired signal to get the vibration position.Tested on a 160-meter fiber,the system can give the vibration position within 500 ms after the vibration occurred.Seting the sampling rate to 10 MHz and after multiple positioning test,the actual positioning error of the system is±10 m.And the positioning does not need the upper computer,which improves the device portability and reduces the cost.