自适应旁瓣对消及其在通信对抗系统中的应用研究

Study on adaptive side-lobe cancellation and its application in communication countermeasure system

为了提高通信对抗系统对干扰信号的抑制能力,提出采用主接收天线为对数周期天线、辅助天线为全向天线的自适应旁瓣对消方法,推导出了无互耦条件下旁瓣对消后输出信号信干比的解析表达式,为辅助天线增益的选取提供了理论依据,计算机仿真结果证实了该方法对干扰信号的抑制能力,提高了通信对抗系统的侦察能力。

In order to improve the inhibiting ability of communication countermeasure system to the interference signal, a method of adaptive side-lobe cancellation is proposed in the paper, in which the main receiving antenna is adopted as the log periodic antenna, and the auxiliary antenna as omni-directional antenna. Without considering the effects of mutual coupling, the analytic expressions for signal-interference-ratio of output signals after side-lobe cancellation are derived, which can serve as a useful theoretical base for selection of auxiliary antennas gain. The computer simulation the results confirm the inhibiting ability of method to suppress any jamming signal. The method improved the detection capability of communication countermeasure system.