基于FDA-MIMO的距离欺骗干扰鉴别方法

Discrimination method of range deception jamming based on FDA-MIMO

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 range deception jamming discrimination method based on the multiple-input multiple-output （MIMO） radar with frequency diversity array （FDA） is proposed. In FDA-MIMO, the phase difference or spatial frequency between different elements of echo is dependent on both range and angle, which implies that the false targets can be discriminated and suppressed due to the mismatch in either range or angle. This paper derives the phase difference and spatial frequency formula of echo, jamming and mixed signal, analyzes the in- fluence of up and down conversion, matched filtering, frequency shift and signal mixing in details, and intro- duces the entire identification process. The effectiveness of proposed method in suppressing jamming is demon- strated via theoretical analysis and computer simulations. Results show that this method can extract the phase difference and spatial frequency accurately, and discriminate false targets successfully under different scenarios.