基于谐波系数幅值平均的复合调制引信抗扫频式干扰方法

为提高混沌码调相与线性调频（CCPM-LFM）复合调制无线电引信的抗扫频式干扰性能，分析了扫频式干扰作用下复合调制无线电引信的响应，并提出了谐波系数幅值平均的抗干扰方法。在瞬时相关和谐波解调串联（ICHD）定距算法原理的基础上，采用快速傅里叶变换（FFT）算法提取谐波包络，并对多次FFT所得谐波系数幅值平均，充分利用混沌码的随机性和统计特性抑制干扰。理论和仿真结果表明:所提方法在不影响引信定距精度的前提下，能够有效抑制扫频干扰。 

Anti sweep jamming method of hybrid modulation fuze based on harmonic coefficient amplitude averaging

To improve the anti sweep jamming performance of the Chaotic Codes Phase Modulation and Linear Frequency Modulation (CCPM-LFM) hybrid modulation radio fuze, the response of the CCPM-LFM fuze under sweep jamming was analysed, and an anti jamming method based on harmonic coefficient amplitude average was proposed. This method was based on the ranging principle of Instantaneous Correlation Harmonic Demodulation (ICHD), and the harmonic envelope extraction was realized by Fast Fourier Transform (FFT) algorithm. By averaging the harmonic coefficient amplitudes obtained from multiple times of FFT, this method took the advantage of the random and statistical characteristics of the chaotic codes, and the jamming was effectively suppressed. Theoretical and simulation results show that the method can effectively suppress the sweep jamming without affecting the ranging resolution of the fuze.