混沌激光相关法测距系统的信号采集与处理

Data acquisition and processing of correlation ranging system with chaotic laser

混沌激光相关法测距技术可用于汽车防撞、光纤及电缆断点检测等,其中混沌信号的快速采集、存储以及处理是重要的单元技术。基于数据采集卡设计并实现了混沌激光测距系统的数据采集与处理,利用Visual Basic平台,开发了采集、存储的控制软件,并提出和编制了平均离散消除算法以实时地实现混沌信号的高信噪比相关运算。利用该采集处理系统,实验获得了低于±0.25 m的光纤断点定位精度。

A data acquisition and processing method is reported for correlation ranging with chaotic laser,which can be used for automotive collision avoidance,fiber or cable fault inspection.We used a data acquisition card with 125 MHz bandwidth and 2ms memory depth as platform to design acquisition and processing.The acquisition and storage were programmed by using Visual Basic,and an average discrete-component elimination algorithm was proposed and programmed to caculate real-time correlation with high signal-to-noise ratio.In the demonstration,we utilized this acquisition and processing system to locate fiber fault with chaotic light,and experimentally obtained an accuracy below ±0.25 m.