基于混频二极管互调干扰的线性调频信号移频干扰  

Shift Frequency Jamming of LFM Signal Based on Inter-modulation Interference of Mixer Diode

作　　者：张磊 滕克难[2] 熊波[2] 

机构地区：[1]海军司令部办公室,北京100036 [2]海军航空工程学院,山东烟台264001

出　　处：《探测与控制学报》2013年第2期29-32,共4页Journal of Detection & Control

摘　　要：移频干扰是对付线性调频信号的一种有效欺骗干扰方式,但在干扰信号与回波信号时间关系不明确时,移频的大小也无法控制。针对这种情况,提出利用混频二极管非线性特性产生的互调干扰来对LFM信号实施移频干扰。该方法通过两个干扰信号的频差对移频大小进行控制,与干扰信号、目标回波信号之间的延时无关。理论分析表明,当两个干扰信号与回波信号一起通过混频二极管时,互调干扰中包含了回波信号差频与两个干扰信号差频的乘积项,因此可以通过两个干扰信号的频差实现移频。仿真结果与理论分析完全吻合,说明该方法是可行的。Frequency-shifting is an effective deception jamming mode to linear frequency modulated （LFM） sig- nal. In condition of ambiguous time relationship between the jamming signal and echo signal, the value of fre- quency-shifting is beyond control. Aiming at this problem, the method of frequency-shifting realization by inter- modulation interference of two jamming signal in mixer diode was brought forward. The value of frequency- shifting could be controlled by difference-frequency of two jamming signals, and bad no relation to time delay be- tween the jamming signal and the goal signal. Theoretic analysis indicated that, when two jamming signal get acrossed mixer diode together with the echo signal, the produced inter-modulation interference contained a prod- uct term of difference-frequency of the echo signal and that of the jamming signal. Then, the frequency-shifting could be carried into reality by difference-frequency of two jamming signal. The computer simulation result tal- lied with theoretic analysis perfectly.

关 键 词：线性调频信号 移频干扰 混频二极管 互调干扰 

分 类 号：TN97[电子电信—信号与信息处理]