水声引信双门控制自调周期抗邻弹干扰方法

Double-gate Controlled the Cycle of Selfmodulation Method Against Neighboring Interference for Underwater Acoustic Fuze

多枚深弹齐射时,在有效探测范围内,可能会出现邻弹干扰,引起引信误动。解决方法有多普勒频偏法和编码法:多普勒频偏法只能确定回波的存在,不能区分类别;编码方法的信号脉宽必须大于脉冲展宽,会增大探测盲区。受蝙蝠双耳对回波敏感的启发,设计一个双门控制信号,以降低近距离体积混响干扰和避免邻弹干扰,控制门内允许接收信号。若两个门内都有信号,则判断该信号为自身发射信号的回波;若第一个控制门内有信号,第二个控制门内无信号,由于多次探测发射信号周期是按规律变化,所以可判断该信号为非自身发射信号,排除邻弹干扰。实验表明,双门控制自调周期信号简单,使深弹水声引信对邻弹引信发射信号回波不敏感,且提高了测距准确率。

When multiple depth charges launched, interference from neighboring depth charges may occur if they are within the detection range, which will cause improper action for active acoustic fuze. Tow methods, Doppler method and encoding method, are available against this kind of interference. The Doppler method could detect echoes but can not classify them, while for encoding method, pulse length should be larger than extended pulse length, so the blind area enlarged. Enlightened by bat＇s ears being sensitive to echoes, a double-gate window control signal was designed to reduce short range volume reverberation and neighboring interference. Signal reception is only allowed within controlled windows. If signals exist in both windows, the signal is considered to be echo form the fuze itself. If signal exists only in the first window,as period of detection signals changes regularly,it can be deduced that the signal is not the echo from the fuze itself, so the neighboring interference can be excluded. Experiment shows that double-gate controlled the cycle of selfmodulation signal is simple, underwater acoustic fuze for depth charge become insensitive to echoes from neighboring charges, and ranging accuracy could be improved.