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

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 <i<S</i<. It was arranged that, when <i<S</i< ≥ 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.