基于FRFT的雷达／电子战一体化系统干扰抑制方法  

Interference Suppression Technique in Radar and EW Integrated System Based on Fractional Fourier Transform

作　　者：张新相[1,2] 齐子忠[2] 陈天麒[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054 [2]空军装备研究院雷达所,北京100085

出　　处：《电子测量与仪器学报》2008年第5期27-32,共6页Journal of Electronic Measurement and Instrumentation

摘　　要：为改善基于噪声-线性频率调制(NLFM)一体化波形的雷达/电子战一体化系统在线性调频(LFM)信号干扰环境下的目标探测能力,提出了采用分数阶Fourier变换(FRFT)抑制LFM信号干扰的方法。分析了NLFM信号和LFM信号在分数阶Fourier域时频聚集性的差别,研究了干扰滤波器的实现方法,比较了不同干扰抑制滤波器的性能差异。仿真结果表明,自适应加权阈值限幅滤波可有效改善一体化系统接收机的输出信干比,且受线性调频斜率测量误差的影响较小。To improve the detection capability of radar and EW integrated system based on Noise-Linear Frequency Modulation （NLFM） integrated waveform in Linear Frequency Modulation （LFM） jamming environment, a jamming suppression method in fractional Fourier domain is presented. The difference of time-frequency properties in fractional Fourier domain between LFM and NLFM signals is investigated, the implementation method of jamming suppression filter is introduced and the performances of different filters are compared. Analysis and simulation indicate that the adaptive weighting threshold limiter can effectively improve the output signal-jamming-ratio, and the slope error of linear frequency modulation has less effect on the performance of the limiter.

关 键 词：雷达 电子战 一体化波形 分数阶FOURIER变换 干扰抑制 

分 类 号：TN911[电子电信—通信与信息系统]