频率分集阵列的有源假目标鉴别方法

Deceptive jamming suppression and discrimination based on frequency diversity array

针对雷达对抗中转发式欺骗干扰的抑制问题,提出一种基于频率分集阵列的干扰鉴别方法。频率分集阵列中,目标回波在相邻阵元间产生的相位差与距离、角度呈线性关系,而假目标不满足该关系。对目标回波和多类假目标干扰在频率分集阵列接收端的相位差进行理论推导,详细分析匹配滤波、信号混合、移频等因素对相位差的影响,并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信息,有效对抗多种类型的转发式欺骗干扰,且鉴别性能对干信比、信噪比均不敏感,具有较强的环境适应性。

Considering the suppression of transmitting deceptive jamming in radar countermeasure,a discrimination method based on frequency diversity array was proposed. In FDA（ frequency diversity array） radar,the phase difference between different element of echo was dependent on both range and angle,which implies that the false targets could be suppressed due to the mismatch in either range or angle. The phase difference formula of echo,jamming and mixed signal were derived,the influence on the phase difference of matched filtering,frequency shift and signal mixing was analyzed in detailed,and the entire identifiable process was introduced. The effectiveness of our proposed scheme in suppressing jamming was demonstrated via theoretical analysis and computer simulations. Results show that the proposed method can discriminate false targets successfully in different scenarios and has a better environmental adaptation.