基于群延迟和模糊函数的LFMICW对消分析

Analysis of LFMICW Cancellation Based on Group Delay and Ambiguity Function

针对线性调频中断连续波(LFMICW)信号的隐身问题,根据LFMICW回波信号中目标信息处理方法,提出利用信号和匹配滤波器的群延迟特性设计LFMICW对消信号。定义了对消误差因子,并分析了信噪比为6 dB且该因子不同取值时单目标的对消结果,利用模糊函数分析对消后的目标合成回波和未对消的干扰目标回波信号的模糊特性,并给出了模糊函数表达式。仿真表明基于所提方法针对LFMICW信号的有源对消,成功地削弱了雷达对目标的探测能力,而且在对消误差因子存在的情况下依然有效。

Aiming at the stealth problem of linear frequency modulated interrupted continuous wave（LFMICW） signal,the LFMICW cancellation signal is designed using the group delay property of the signal and matched filter,according to the target information processing method of LFMICW echo signal.Cancellation error factor is defined,and the cancellation effects of single target are analyzed at SNR 6 dB and different values of the factor.The ambiguity characteristics of synthesize echo of cancellation target and echo of un-cancellation interfere target are analyzed through ambiguity function.And the formula of ambiguity function is provided.Simulated results indicate that the LFMICW active cancellation measure based on the proposed method can reduce the target detection capability of enemy HFGWR successfully,and it is still effective with the existence of cancellation error factor.