Pulse Doppler (PD) fuze is widely used in current battlefield. However, with the threat of repeater jamming, especially digital radio frequency memory technology, the deficiency in the anti-repeater jamming of a traditional PD fuze increasingly emerges. Therefore, a repeater jamming suppression method for a PD fuze based on identity (ID) recognition and chaotic encryption is proposed. Every fuze has its own ID which is encrypted with different chaotic binary sequences in every pulse period of the transmitted signal. The thumbtack-shaped ambiguity function shows a good resolution and distance cut-off characteristic. The ability of anti-repeater jamming is emphatically analyzed, and the results at different signal-to-noise ratio (SNR) show a strong anti-repeater jamming ability and range resolution that the proposed method possesses. Furthermore, the anti-repeater jamming ability is influenced by processing gain, bit error rate (BER) and correlation function. The simulation result validates the theoretical analysis, it shows the proposed method can significantly improve the anti-repeater jamming ability of a PD fuze.

脉冲多普勒（PD）引信在当前战场上被广泛使用。然而，随着中继器干扰的威胁，特别是数字射频存储技术的出现，传统PD引信的抗中继器干扰的缺陷日益显现。因此，提出了基于身份（ID）识别和混沌加密的PD引信的中继器干扰抑制方法。每个引信都有自己的ID，该ID在发射信号的每个脉冲周期中都使用不同的混沌二进制序列进行加密。图钉形的歧义函数显示出良好的分辨率和距离截止特性。着重分析了抗中继干扰能力，在不同信噪比下的结果表明，该方法具有较强的抗中继干扰能力和测距分辨率。此外，抗中继器的干扰能力受处理增益，误码率（BER）和相关函数的影响。仿真结果验证了理论分析的正确性，表明所提方法可以显着提高PD引信的抗中继干扰能力。