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从电路设计角度来说,在接收机视放以前,抑制干扰脉冲主要有三种方法:一是干扰脉冲熄灭法,其实质是在干扰脉冲期间,使接收机输出为零。这种方法技术实现复杂,在实际中放中应用较少;二是限幅法(包括“宽—限—窄”系统),其工作原理是利用限幅器的限幅作用来削弱干扰脉冲的幅度。这种方法应用较广,能有效地抑制干扰脉冲。但对于窄带干扰,当输入(S/N)_i<1时,由于限幅器本身固有的非线性拍频作用,将不可避免地产生强干扰抑制弱信号的有害作用,从而使后面的窄带滤波器不能有效地从频域抑制窄带干扰、提出有用信号;三、文献[5—8]提出了抗电子干扰的
From the circuit design point of view, there are mainly three ways to suppress the interference pulse before the receiver plays video: one is the interference pulse quenching method, and its essence is to make the receiver output zero during the interference pulse. This method is complicated in technology and less in practical applications. The second is the clipping method (including “wide-limited-narrow” system). The working principle of the method is to limit the interference pulse by the limiter of the limiter Magnitude. This method is widely used, can effectively suppress the interference pulse. But for the narrow-band interference, when input (S / N) _i <1, the inherent non-linear beat-frequency effect of the limiter will inevitably produce the strong interference to suppress the detrimental effect of the weak signal so that the latter narrow-band filtering Third, the literature [5-8] proposed the anti-electronic jamming