数字多时延灵巧干扰信号研究

为了适应数字干扰设备干扰脉压接收机时对数字脉内相干干扰信号的需求,研究了一种数字多时延灵巧干扰信号.首先通过数学推导得到多时延数字灵巧干扰信号的数学模型,并论证该模型可作为循环转发干扰信号、脉内多假目标干扰信号和数字多时延灵巧噪声的统一数学模型;然后从理论上分析数字多时延灵巧噪声对脉压接收机的欺骗干扰机理和噪声压制干扰机理;接着通过数字延迟叠加方法和快速卷积算法设计了两种多时延灵巧噪声的数字实现算法;最后以线性调频脉冲压缩信号为例,对两种算法产生的数字多时延灵巧噪声通过匹配滤波器前后的时域、频域、时频域特征进行仿真分析,验证了算法有效性同时直观呈现了数字多时延灵巧噪声对脉压接收机的干扰效果.研究表明多时延灵巧噪声能够有效干扰脉压接收机,并造成脉内多假目标欺骗干扰效果和高效的噪声压制干扰效果.

Study on Digital Multidelay Smart Jamming Signal

To meet the requirement of digital jammer for digital cohere nt jamming signal when jamming pulse compression receiver, digital multidelay sm art jamming signal is studied. Firstly, mathematical model of digital multidelay smart jamming signal which can be used for representing cycle retransmitting jamming signal, multi false target in s ingle pulse duration jamming signal and digital multidelay smart noise is established. Posteriorly, the deceiving and noise jamming mechanism of pulse co mpression receiver by digital multidelay smart noise is analysed. Then, two algo rithms of digital multidelay smart noise are presented based on digital delay ac c umulation and fast convolution modulation. Finally, taking the LFM signal as exa mple , the pre and post matched filter characteristics in time domain, frequ ency domain and time frequency domain of digital multidelay smart noise generat ed by two different algorithms are analysed by simulation. The study shows that d igital multidelay smart noise can effectively jam pulse compression receiver and achieves the effect of multi false target in single pulse deceiving and noise cover up.