冲激噪声背景下线性调频信号参数估计  

Parameter Estimation of Linear Frequency Modulation Signals in Impulse Noise Background

作　　者：蒋东旭 任培林 JIANG Dong-xu;REN Pei-lin(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》2022年第4期95-97,共3页Shipboard Electronic Countermeasure

摘　　要：针对现有冲激噪声背景下线性调频信号参数估计方法计算复杂度高、需要设置超参数等问题,提出了一种冲激噪声背景下线性调频信号参数估计新方法。该方法选择具有良好限幅特性的双曲正切函数对冲激噪声实现有效抑制,并对抑制噪声后的信号进行延时自相关和高精度测频,实现信号的参数估计。仿真实验表明,与现有方法相比,所提方法在低信噪比情形下具有更佳的参数估计性能,且无需设置超参数。Aiming at high computational complexity and the requirement of hyperparameter setting of linear frequency modulation(LFM)signal parameter estimation methods in existing impulse noise background,a new parameter estimation method of LFM signal in impulse noise background is proposed in this paper.For the proposed method,the hyperbolic tangent function with good amplitude limiting characteristics is selected to effectively suppress the impulse noise,and the delay autocorrelation and high-precision frequency measurement are carried out for the signal after noise suppression to realize the parameter estimation.Simulation experiment shows that,compared with the existing method,the proposed method has better parameter estimation performance in low signal-to-noise ratio scenario,and there is no need to set hyperparameters.

关 键 词：冲激噪声 线性调频信号 双曲正切函数 参数估计 

分 类 号：TN911.7[电子电信—通信与信息系统]