一种采用匹配滤波的线圈靶测速精度改进方法  

Method for Improving the Speed Measurement Accuracy of Coil Target Using Matched Filter

作　　者：王祎楠 倪晋平[1,2] 陈丁[1,2] 姬博文 WANG Yinan;NI Jinping;CHEN Ding;JI Bowen(School of Armament Science and Technology,Xi’an Technological University,Xi’an 710021,China;Shaanxi Province Key Laboratory of Photoelectric Measurement and Instrument Technology,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学兵器科学与技术学院,西安710021 [2]西安工业大学陕西省光电测试与仪器技术重点实验室,西安710021

出　　处：《西安工业大学学报》2020年第6期662-666,共5页Journal of Xi’an Technological University

基　　金：国家国防科工局基础科研项目(JSJL2017208B009);陕西省自然科学基础研究计划(2019JM-601)。

摘　　要：为了解决线圈靶在大直径线圈靶测量小口径弹丸时存在低信噪比情况下测速误差大的问题,研究了一种采用匹配滤波原理的线圈靶信号飞行时间提取方法,分析了低信噪比情况下的线圈靶感应信号的特征,获得了启动靶与停止靶输入信号与输入电压信号的共轭滤波后最大信噪比的输出信号,两输出信号峰值之间的时间即弹丸飞过启动靶与停止靶的时间。实验结果表明,采用匹配滤波方法后的线圈靶与光幕靶在0 dB的测速相对误差不大于0.6%,可有效地提高大直径线圈靶测量小口径弹丸的测速精度。The velocity measurement error becomes larger due to low signal-to-noise ratio(SNR)when a large-diameter coil target measures small-caliber projectiles.To solve this problem,the paper presents a method for extracting the flight time of a coil target signal based on matched filtering.The characteristics of the induction signals of the coil target are analyzed,and the output signal with the maximum SNR after the conjugate filtering of the input signals of the start target and the stop target and the input voltage signal is obtained.The time between the peaks of two output signals is the time that a projectile takes to fly from the start target to the stop target.The experimental results show that the relative error of the velocity measurement between the coil target and the light screen target is less than 0.6%at 0 dB SNR after the matched filtering method is used.The proposed method can effectively improve the accuracy of the large-diameter coil target for measuring small-caliber projectiles.

关 键 词：弹丸速度 线圈靶 过零时刻 匹配滤波 

分 类 号：TJ410.6[兵器科学与技术—火炮、自动武器与弹药工程]