基于有限元的伪码调相电磁引信目标信号分析

摘要

伪码调相信号具有抗干扰能力强,不易被发现,相互影响小等优点.文中通过Ansoft对引信过靶运动过程进行1:1尺度的3D建模仿真和有限元电磁场计算,获取了伪码调相电磁引信目标信号的仿真波形数据,重点分析了目标信号的幅度、相位特征,尤其是相位跳变的形成原理.基于仿真分析结果的检测方法在陆上试验中成功检测出了明显的目标信号包络,验证了分析结果的正确性.该研究可为伪码调相信号在鱼雷电磁引信中应用的可行性和目标检测提供依据.%Phase modulated by pseudorandom code(PM-PC) signal has such advantages as strong anti-interference ability,concealment,and weak interaction with each other.In this paper,the software Ansoft is adopted to perform three-dimensional modeling of fuze passing target motion process in the scale of 1:1 and finite element calculation of the electromagnetic field.Consequently,the simulated waveform data of PM-PC target signal of electromagnetic fuze is achieved.The target signal amplitude and phase characteristics,especially the formation principle of phase jump,are analyzed in detail.According to the simulation results,obvious target signal envelope is successfully detected in land test,which verifies the correctness of the present analysis.This research may provide the basis for application of PM-PC signal to torpedo electromagnetic fuze and target detection.