基于PCT的弹丸膛内运动回波信号瞬时频率估计  

Instantaneous Frequency Estimation for the Echo Signal of Projectile Motion in Bore Based on PCT

作　　者：王鉴 韩焱[1,2] 陈平 王黎明[1,2] 张丕状 WANG Jian;HAN Yan;CHEN Ping;WANG Li-ming;ZHANG Pi-zhuang(Key Laboratory of Information Detection and Processing,North University of China,Taiyuan 030051,China;College of Information&Communication Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]信息探测与处理山西省重点实验室,太原030051 [2]中北大学信息与通信工程学院,太原030051

出　　处：《火力与指挥控制》2018年第4期13-17,共5页Fire Control & Command Control

基　　金：基础科研基金(JCKY 2014**001);国家自然科学基金(61571404;61471325;61301259;61227003);山西省自然科学基金(2015021099);山西省优秀青年学术带头人计划基金资助项目

摘　　要：微波干涉仪可间接无损测出弹丸在膛内的行程-时间曲线,为内弹道学的膛内运动规律研究提供一种必不可少的技术手段。瞬时频率的估计精度决定了各参数的测量精度,由于弹丸膛内运动的回波信号是非线性调频信号,可采用多项式相位信号模型对其数学描述。为了得到较高的时频聚集性和瞬时频率估计精度,采用多项式调频小波变换(PCT)对模拟、真实的弹丸回波信号进行分析并与时频聚集性较好的WVD方法进行对比。实验结果表明:相对于WVD方法,PCT方法在模拟回波信号的抗高斯白噪声方面更有效,在分析真实回波信号中炮口杂乱信号的问题上,具有更强的提取有用信号的能力。总的来说,基于PCT的瞬时频率估计方法是一种有效分析弹丸膛内运动回波信号的方法。Microwave interference instrument can indirectly nondestructive measure travel-time curve of projectile in bore and provide a necessary technical means for the gun movement research of interior ballistics.The estimation accuracy of the instantaneous frequency determines the measurement accuracy of the each measured parameter.As the echo signal of the projectile motion in bore is a nonlinear FM signal,the mathematical description of the signal can be described by the polynomial phase signal model.In order to obtain high time-frequency concentration and estimation accuracy of the instantaneous frequency,the PCT method is used to analysis the simulated and experimental signal in this paper.Compared with the WCT method,which is considered to have good time-frequency aggregation,the PCT method is more effective in suppression of Gauss white noise in the simulated signal,and has a stronger ability to extract the useful signal from the muzzle disorderly signal in experimental signal.Generally,the method of instantaneous frequency estimation based on PCT is an effective to analyze the echo signal of projectile motion in bore.

关 键 词：瞬时频率估计 多项式调频小波 非线性调频 弹丸运动 

分 类 号：TN98[电子电信—信息与通信工程] TJ012.1[兵器科学与技术—兵器发射理论与技术]