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为客观评价某型米波无线电引信的抗电磁脉冲(EMP)干扰能力,构建了引信电磁脉冲辐照效应试验系统,开展了超宽带电磁脉冲(UWBEMP)、核电磁脉冲(NEMP)、雷电电磁脉冲(LEMP)辐照效应试验,分析了受试引信的效应规律和失效机理。试验结果表明:在电磁脉冲辐照条件下,受试引信最敏感受试姿态为引信装定孔正对天线,弹体方向与电场方向平行;主要能量耦合通道为弹体;一定参数的UWBEMP和NEMP可以造成引信意外发火,而LEMP不能造成引信发火;重复频率越高,电磁脉冲对引信的干扰能力越强,同为70 kV/m的UWBEMP辐照场强,单次、10 Hz重频、20 Hz重频和50 Hz重频触发条件下引信的发火率分别约为20%、60%、80%、100%;晶闸管(SCR)为电磁脉冲作用下引信执行电路的敏感器件;受试引信的失效机理为:辐射能量通过弹体耦合到执行电路电源端,耦合电压瞬态变化率超过了晶闸管断态电压临界上升率而使晶闸管导通,进而导致引信意外发火。
In order to objectively evaluate the anti-electromagnetic pulse (EMP) interference ability of a certain type of m-wave radio fuze, a test system for the irradiation effect of a fuze electromagnetic pulse was constructed. UWBEMP, NEMP, (LEMP) irradiation effect test, the analysis of the test fuze effect rules and failure mechanism. The experimental results show that under the condition of electromagnetic pulse irradiation, the most sensitive test fuze of the tested fuze is the fixed mounting hole facing the antenna with the direction of the projectile parallel to the electric field; the main energy coupling channel is the projectile; the UWBEMP and NEMP can cause accidental ignition of fuze, while LEMP can not cause fuze firing; the higher the repetition frequency, the stronger the interference of electromagnetic pulse to the fuze, the same as the field intensity of UWBEMP of 70 kV / m, The firing rates of fuze under 20 Hz repetition rate and 50 Hz repetition frequency triggering are about 20%, 60%, 80% and 100% respectively. Thyristor (SCR) is a sensitive device of the fuze executive circuit under electromagnetic pulse. The failure mechanism is that the radiation energy is coupled to the power supply terminal of the executive circuit through the projectile, and the transient rate of change of the coupling voltage exceeds the critical rising rate of the thyristor off-state voltage to turn on the thyristor, thereby causing the fuze to fire unexpectedly.