基于频控阵二维空域滤波的干扰抑制方法

An interference suppression method based on 2D spatial filtering of FDA systems

频率分集阵列(FDA)因其可提供距离维自由度而吸引了广大学者的注意。基于FDA的MIMO雷达可实现比传统阵列雷达更好的目标参数估计能力。然而,当FDA-MIMO雷达受到主瓣欺骗式干扰时,系统的目标探测、参数估计能力将严重下降,甚至无法检测出目标。传统抗干扰方法无法有效抑制主瓣欺骗式干扰。对此,设计了一种基于混沌序列载波频偏的二维空域滤波器,可在抑制主瓣干扰的同时有效保留目标信号。数值仿真实验验证了所提方法的可行性与有效性。对比了基于对数载波频偏的二维空域滤波器,对比仿真结果表明基于混沌序列的方法可以在抑制干扰的同时更好地保留目标信息。

Frequency diverse arrays have attracted wide attention of researchers,due to the array system can provide controllable degree of freedom in range dimension.FDA-MIMO radar systems can achieve better target detection capability than common array radars.However,when FDA-MIMO radar suffers from mainlobe decep-tive interference,the target detection performance will be seriously degraded.Unfortunately,traditional interfer-ence suppression methods cannot suppress main lobe deceptive interference effectively.A two-dimensional spatial filter design method based on chaotic sequence based nonlinear frequency offset is proposed.Numerical simula-tions demonstrate the effectiveness of the proposed method.Compared with the 2D spatial filter based on logarith-mic nonlinear frequency offset,the filter based on chaotic sequence based nonlinear frequency offset can suppress interference and retain targets information better.