膛内运动弹丸微多普勒建模与仿真  

Establishment and Simulation of In-bore Moving Projectile Micro-Dopple Model

作　　者：陈曦[1] 许建中[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,南京210094

出　　处：《现代雷达》2013年第8期80-83,共4页Modern Radar

摘　　要：针对太赫兹波段弹丸膛内轴向运动同时存在横向摆动产生的微多普勒现象不容忽略的情况,文中采用刚体运动学和传统多普勒分析相结合的方法,推导了其微多普勒数学公式和回波信号模型。通过仿真验证了理论推导的正确性,同时表明弹丸平动加速度会使微多普勒沿时变频率方向发生倾斜,其附加频率调制作用使提取的弹丸速度产生波动,为进一步研究微多普勒提取技术提供了理论基础。In terms of the problem that the micro-Doppler phenomenon cannot be ignored in Tera Hertz band, which is produced by projectile transverse swings in addition to axial motions within the bore, based on the method of the traditional Doppler analysis combined with rigid body kinematics, the mathematical formula of the micro-Doppler was derived and the echo model was built in this paper. The validity of the mathematical model is testified through the theoretical analysis and the simulation. Meanwhile the simulation results show that the micro-Doppler tilts along the direction of time-varying frequency due to the translational acceleration, and the velocity fluctuates caused by the additional frequency modulation. It can provide the theoretical support for microDoppler features extraction.

关 键 词：膛内测速 微多普勒 横向摆动 太赫兹 瞬态信号 靶场测试 

分 类 号：TJ012.1[兵器科学与技术—兵器发射理论与技术]