通信电台带外多频干扰预测方法与验证

Out-of-Band Multi-Frequency Interference Prediction Method and Verification for Communication Station

通信电台在受到带外强场干扰时会出现重启效应,当其处于外界复杂电磁环境中,在现有电磁敏感度测试方法所得的安全区域内,电台仍存在受到干扰而重启的可能.已知干扰的主要耦合途径是电台外部的互连线缆,对电台带外重启效应的敏感类型作出两种假设:一种是重启效应与干扰信号的有效值相关,另一种是重启效应与干扰信号的峰峰值相关.为了确定受试对象的敏感类型,分别用正弦波和调幅波作为干扰源,调幅深度设为100%,当达到临界干扰状态时,如果是与有效值相关,两个干扰信号幅值的比值约为0.61;如果是与峰峰值相关,两者的比值为1.当同时存在多个干扰源时,选择对应的预测模型计算预测系数,如果S≥1,可以判定电台会重启,反之不能.最后,以某带外接线缆的通信电台为试验对象,通过试验验证上述方法是可行的.

Communication station will restart when they are irradiated by out-of-band interference strongly.When they are exposed to a complex external electromagnetic environment,communication station may still be disturbed and restarted within the safety area divided by the existing electromagnetic sensitivity test method.Considering the interconnect cable outside the station as the main coupling channel of interference,two assumptions about the sensitive type of the restart effect were made for the communication station,relating to the effective value of the interference signal,relating to the peak-to-peak value of the interference signal.In order to determine the sensitive type of the equipment under test,a sine wave and an amplitude modulation wave with 100%modulation deep were taken as interference sources.Test results show that,when the critical interference state is reached,if it is related to the effective value,the ratio of the amplitude between the two interference signals is about 0.61;if it is related to the peak-to-peak value,the ratio between them is 1.Considering multiple interference sources existing at the same time,corresponding prediction models were established to be selected to calculate the prediction coefficient,named as S.It was arranged that,when S≥1,the communication station would restart,and vice versa.Finally,taking a certain type communication station with interconnect cable as test object,the feasibility of the above method was verified through experiment.