一种改进抽样函数自适应滤波的抗灵巧噪声干扰方法  

An Anti-smart Noise Jamming Method Based on Improved Sampling Function Adaptive Filtering

作　　者：闵柏成 张世超 陈凯翔 邱硕丰 MIN Bai-cheng;ZHANG Shi-chao;CHEN Kai-xiang;QIU Shuo-feng(The 8th Research Academy of CSSC,Yangzhou 225101,China)

机构地区：[1]中国船舶集团有限公司第八研究院,江苏扬州225101

出　　处：《舰船电子对抗》2023年第3期35-41,共7页Shipboard Electronic Countermeasure

摘　　要：在灵巧噪声干扰环境中,线性调频脉冲压缩体制的机载雷达对目标回波形成极好的压制性和欺骗性干扰效果,导致常规的抗干扰措施无法在时域及频域分离干扰和目标回波。针对此问题,提出了一种改进抽样函数自适应滤波的干扰抑制方法。该方法首先通过差拍处理,将信号中的二次调制项消除,使信号和干扰在频域实现解耦分离。然后采用一种改进抽样函数的变步长滤波算法,滤除解耦后的回波信号分量,最后对消解耦前后的干扰分量,通过逆差拍处理恢复目标回波信号。所提出的差拍处理方法可在频域上有效分离目标回波和灵巧噪声干扰,并通过改进的抽样函数调节步长,使解耦前后的干扰实现有效的对消。仿真结果表明,采用该方法可有效地对回波信号分量滤波,干扰分量对消效果明显,并能在信干比较低的环境下仍具有良好的鲁棒性。In the smart noise jamming environment,the airborne radar of linear frequency modulation pulse compression system has an excellent suppressing and deceptive jamming effect on the target echo,resulting in the inability of conventional anti-jamming measures to separate the jamming signals from target echo signals in time domain and frequency domain.To solve this problem.a jamming suppression method based on improved sampling function adaptive filtering is proposed.Firstly,the secondary modulation term in the signals is eliminated by beat processing,so that the signals and jamming signals can be decoupled and separated in the frequency domain.Then a variable step size filtering algorithm based on improved sampling function is adopted to filter the decoupled echo signal components.Finally,the jamming components before and after decoupling are cancelled,and the target echo signals are recovered by inverse beat processing.The beat processing method proposed can effectively separate the target echo and smart noise jamming signals in the frequency domain,and adjust the step size through the improved sampling function,so that the jamming signals before and after decoupling can be effectively eliminated.The simulation results show that the method can effectively filter the echo signal components,and the jamming component cancellation effect is obvious,and it can still have good robustness in the environment of low signal jamming ratio.

关 键 词：灵巧噪声 差拍处理 抽样函数 自适应滤波 干扰抑制 

分 类 号：TN973.2[电子电信—信号与信息处理]