弹丸在膛内运动的回波信号瞬时频率估计方法研究  

Estimation Method for Instantaneous Frequency of Echo Signal of Projectile in Bore

作　　者：王鉴[1,2] 韩焱[1,2] 王黎明[1,2] 张丕状[1,2] 陈平[1,2] 

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

出　　处：《兵工学报》2017年第9期1806-1814,共9页Acta Armamentarii

基　　金：国家国防科技工业局技术基础科研项目(JCKY2014408C001);国家自然科学基金项目(61571404;61471325;61301259;61227003);山西省自然科学基金项目(2015021099);山西省优秀青年学术带头人计划项目(2016年)

摘　　要：微波干涉仪可获取含内弹道运动信息的多普勒回波信号,为有效地估计回波信号的瞬时频率,利用短时傅里叶变换、Wigner-Ville变换、多项式调频小波变换(PCT)等方法对含有不同噪声的模拟弹丸回波信号和真实的弹丸回波信号进行分析和对比。研究结果表明:多项式调频小波构造匹配变换核的PCT方法时频聚集性最好,瞬时频率估计精度最高,并具有一定的抗干扰能力,说明PCT方法适合于弹丸在膛内运动回波信号的瞬时频率估计。The microwave interferometer can obtain the Doppler echo signal containing interior ballistic motion information. In order to estimate the instantaneous frequency of echo signal effectively,a mathematical model of motion curve of projectile in bore is established based on polynomial fitting. The methods of short-time Fourier transform,Wigner-Ville distribution,polynomial chirplet transform（ PCT）are used to analyze the simulation echo signals of projectiles with different noise and experimental echo signals of projectiles,respectively. The results show that the PCT method which uses transform kernel based on polynomial frequency modulated wavelet has the best time-frequency concentration and accuracy of instantaneous frequency estimation（ IFE） and good anti-interference ability compared with the other methods. The research results show that the PCT method is suitable for IFE of projectile＇s signals.

关 键 词：兵器科学与技术 瞬时频率估计 弹丸运动 微波干涉仪 时频分布 

分 类 号：TJ012.16[兵器科学与技术—兵器发射理论与技术]