Research on blocking interference for digital radio station under UWB EMP

Jianyong Zheng,Guanghui Wei,Chao Qi

doi:10.1063/5.0048853

Abstract

In order to make certain of the blocking impact of the ultra-wideband electromagnetic pulse (UWB EMP) on a radio communication station, an EMP injection test was conducted to study the blocking interference of a digital radio station under a step pulse train and double exponential pulse train. Combined with waveform parameters such as the pulse repetition rate (PRR), the concept of influence time when the UWB EMP was irradiated on the equipment under test (EUT) was introduced, and the model was established. According to the experimental results, the blocking impact of the EUT under the UWB EMP depended on factors such as waveform, PRR, and amplitude. The relationship between the PRR and the sensitive bit error rate could be determined by the effect test. In the case of a low PRR, the sensitive voltage threshold of the EUT was irrelevant to the PRR, and the effect was the monopulse effect. When the PRR reached above the reciprocal of the influence time, the sensitive voltage threshold of the EUT decreased with the increase in the PRR, which conformed to the cumulative multiple pulse effects.

Highlights

As electronic technology develops rapidly, radio frequency (RF) equipment has been applied on a large scale, which makes the electromagnetic environment where the electronic equipment works increasingly complex
Radiated fields from Electrostatic Discharge (ESD), lightning EMPs, and ultra-wideband electromagnetic pulses (UWB EMPs) will cause interference with sensitive equipment. It is difficult for electrostatic, lightning, and nuclear EMPs to form a stable, continuous pulse train, UWB EMPs can form a pulse train with a pulse repetition rate (PRR) greater than 1000 Hz
The frequency ranges from 100 kHz to 1.5 GHz, the flatness of frequency response is better than 2 dB, the injection coupling degree is 10 dB, and there is no occurrence of phase mutation at the injection and output ports, which is conducive to ensuring that the interference signal injected into the input terminal of the equipment under test (EUT) remains a rectangular pulse train

Summary

INTRODUCTION

As electronic technology develops rapidly, radio frequency (RF) equipment has been applied on a large scale, which makes the electromagnetic environment where the electronic equipment works increasingly complex. This paper is devoted to the interference effect and mechanisms of UWB EMPs and electromagnetic compatibility and protection of radio communication stations. These studies focus mainly on such hardware disruption as equipment breakdown and restart are a result of the interference caused by monopulses, single pulses, continuous waves, or digital modulation signals, with little attention paid to the blocking interference under the continuous pulse train with different waveforms and its underlying mechanism. It is necessary to simulate long-distance communication At this time, the amplitude of the working signal received by the station is limited, and it is prone to disruption caused by the uncontrollable external interference of other forms. From the monitor-port of the directional coupler, a digital storage oscilloscope was employed to detect the waveform and amplitude of the injected signal, based on which the relationship between the BER and the amplitude and frequency of the injected

STEP PULSE EXPERIMENT

Sensitivity criteria

Experimental results and analysis

DOUBLE EXPONENTIAL PULSE EXPERIMENT

Findings

CONCLUSION