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提出了一种基于频率分集阵列多输入多输出(FDA-MIMO)的距离欺骗干扰鉴别方法。FDA-MIMO中,目标回波在阵元间产生的相位差及空间角频率与距离、角度呈线性关系,而假目标不满足该关系。本文对目标回波和多类假目标在FDA-MIMO接收端的相位差、空间角频率进行了理论推导,详细分析了上下变频、匹配滤波、信号混合、移频等因素的影响,给出了假目标鉴别的具体流程。理论分析及仿真结果表明,该方法能准确提取混合信号的相位差及空间角频率信息,有效对抗多种类型的转发式欺骗干扰。
A method of distance deception jamming based on frequency diversity array multiple input multiple output (FDA-MIMO) is proposed. In FDA-MIMO, the phase difference and spatial angular frequency generated by the target echoes are linear with the distance and angle, while the false targets do not satisfy the relationship. In this paper, the phase difference and spatial angular frequency of the target echoes and many kinds of false targets at the FDA-MIMO receiving end are theoretically deduced. The effects of up-and-down frequency conversion, matched filtering, signal mixing and frequency shifting are analyzed in detail. Target identification of the specific process. Theoretical analysis and simulation results show that this method can accurately extract phase difference and space angular frequency information of mixed signals and effectively combat many types of forwarding spoofing interference.