基于FPGA的双目高精度宽波段激光告警系统  

Binocular High Precision Wide Band Laser Warning System Based on FPGA

作　　者：张卓奇 张瑞[2,3] 牛家麒 王志斌 ZHANG Zhuoqi;ZHANG Rui;NIU Jiaqi;WANG Zhibin(School of Instruments and Electronics,North University of China,Taiyuan 030051,China;Shanxi Province Optoelectronic Information and Instrumentation Engineering Technology Research Center,Taiyuan 030051,China;Academy for Advanced Interdisciplinary Research,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学仪器与电子学院,太原030051 [2]中北大学山西省光电信息与仪器工程技术研究中心,太原030051 [3]中北大学前沿交叉科学研究院,太原030051

出　　处：《计算机测量与控制》2024年第4期279-286,共8页Computer Measurement &Control

基　　金：国家自然科学基金(62105302)。

摘　　要：针对传统二维激光告警系统的光斑中心提取误差大、角度测量精度差和分辨率低的问题,设计了一种基于FPGA和InGaAs焦平面阵列探测器的高精度宽波段激光告警系统,对传统的Otsu(最大类间方差法)阈值分割算法进行了推导和优化,同时,基于改进后的算法,通过FPGA实现了光斑中心坐标提取以及方位角、俯仰角等参数的计算,并将结果传输至上位机实时监测;实验结果显示,相较于传统的阈值分割算法,改进后的Otsu算法使光斑中心提取精度达到了0.06个像素,改进后的激光告警系统角度测量平均误差为0.03°,角度分辨率达到0.05°;实验表明,双目高精度宽波段激光告警系统达到了实际应用的要求,提高了系统测量的角度分辨率和精度,对光电探测和激光告警领域的工作具有一定的意义。Aiming at the problems of large err in extracting the center of light spot,poor measurement accuracy of angle and low resolution of traditional two-dimensional laser warning systems,a high-precision wide-band laser warning system based on FPGA and InGaAs focal plane array detectors is designed,and the traditional Otsu(maximum inter-class variance method)threshold segmentation algorithm is derived and optimized.Based on the improved algorithm,the center coordinates of spot are extracted,the parameters such as azimuth angle and pitch angle are calculated by FPGA,and the results are transmitted to the upper computer for real-time monitoring.Experimental results show that compared with traditional threshold segmentation algorithms,the spot center extraction accuracy of the improved Otsu algorithm reaches 0.06 pixels,the average angle measurement error of the improved laser alarm system is 0.03°,and the angle resolution reaches 0.05°,the binocular high precision wide band laser warning system meets the requirements of practical application,improves the angular resolution and accuracy of the system measurement,and has a certain significance for the work in the field of photoelectric detection and laser warning.

关 键 词：二维激光告警 OTSU FPGA 光斑中心提取 光电探测 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]