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一种改进的外辐射源雷达直达波对消算法
李坤合,芮义斌
0
(南京理工大学 电子工程与光电技术学院,南京 210094)
摘要:
针对外辐射源雷达的直达波对消技术,传统的变步长对消算法依据参考信号或对消后瞬时误差进行步长调整,对于剩余的目标回波等信号也产生了抑制效果,同时影响了直达波信号的对消效果,为此,提出了一种基于对消信号与直达波的相关性的Sigmoid函数变步长最小均方(Variable Step Size LMS based on Sigmoid function,SVSLMS)算法,根据对消后的信号与直达波的相关性进行步长调整。理论分析与仿真结果表明,改进的SVSLMS算法对直达波对消有更快的收敛速度,同时对目标回波信号的影响更小。
关键词:  外辐射源雷达  直达波对消  步长调整  Sigmoid函数
DOI:
基金项目:
An Improved Direct Path Interference Cancellation Algorithm for Passive Radars
LI Kunhe,RUI Yibin
(School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
Abstract:
For the direct path interference cancellation technology of passive radars,traditional cancellation algorithm varies the step size based on the reference signal or the instantaneous error,which makes the suppression effect on the remaining target echo and other signals,and affects the direct path interference cancellation result at the same time.A variable step size LMS based on Sigmoid function(SVSLMS) algorithm is proposed for adjusting step size according to the correlation between the cancellated signal and the direct path signal.Theoretical analysis and simulation results show that the improved SVSLMS algorithm has a faster convergence speed for direct path interference cancellation and has less impact on the target echo signals.
Key words:  passive radar  direct path interference cancellation  adjusting step size  Sigmoid function
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