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Interference mechanism of high repetitive frequency UWS-EMP to communication receiver

The interference experiment of a communication receiver by ultra-wide spectrum electromagnetic pulse (UWS-EMP) is carried out and the interference process is monitored based on the design of experimental approach and experimental system. The research shows that the interference to High-speed Frequency Hopping communication, Direct Sequence Spread Spectrum (DSSS) communication and Fixed Frequency communication by UWS-EMP is effective. Combined with the non-linear responses of key communication devices caused by UWS-EMP, the interference mechanism is presented as follows: the intense UWS-EMP in ns order passing through the low noise amplifier (LNA), mixer and filter of receiver is converted to the secondary interference signal with largely extended duration, then the automatic gain control (AGC) circuit is disturbed by the secondary interference signal and the AGC control voltage is turned to be abnormal, therefore, the gain of the receiver is declined, the normal signal can't be amplified sufficiently and the communication is interrupted temporarily. Furthermore, when the repetition frequency of UWS-EMP is high enough, the communication will be disrupted continually.