基于Choi-Williams分布的侵彻层数识别方法

Identification of penetration layers based on Choi-Williams distribution

针对侵彻多层硬目标过程中实测加速度信号的振荡叠加,以及可能引起的层数误判问题,采用时频分析法研究弹体主轴方向加速度信号的Choi-Williams能量分布特征,提出了以侵彻过程加速度信号的能量分布为依据的层数识别方法。侵彻8层等间距混凝土靶板的实测数据处理结果表明,该方法可快速准确实现层数识别,解决了低通滤波方法无法获取准确层数信息的问题,为实时控制起爆位置提供依据。

There is an oscillation signal superposition on measured acceleration signals during the process of penetrating multilayer hard targets, which can cause a misjudgement of the target layer number. To overcome the above problem, a time-frequency analysis method was adopted to study the Choi-Williams energy distribution features of the acceleration signals in the directions of projectile main axes. Based on the energy distribution of the acceleration signals during penetration process, a target layer identification method was put forward. The acceleration data were processed, and these data were measured from the penetration of eight concrete slabs with the same thickness by a projectile. The processed results show that the layer identification method put forward can identify the layer number rapidly and accurately. The problem, that the low-pass filtering method can not acquire the accurate layer number, was solved. So the layer identification method put forward can provide basis for the real-time control of initiation positions.