通信电台带外连续波强场辐照重启效应分析

通过对开关电源及通信电台进行带外连续波强场干扰试验，发现带外强场干扰会使电台重启。其主要原因是带外连续波干扰导致开关电源输出电压下降，当供电电压下降到一定程度时，电台关闭。取消干扰，开关电源又能正常工作，电台会自动启动。以开关电源和通信电台作为受试设备，其对20~100 MHz频率范围内的连续波干扰的敏感程度不同，对70 MHz左右的干扰频率最为敏感，而70 MHz的半波长恰好与线缆长度相近，说明线缆是干扰的主要耦合通道。电台作为用频装备，在干扰试验中对敏感频点和临界干扰场强的影响并不明显，主要是因为电台的机壳对20~100 MHz的干扰屏蔽效果较好，所以不会影响试验结果，将电台替换为50 负载，试验规律相同。干扰在20~100 MHz频率范围内，通过对开关电源的输出线和输入线分别屏蔽的干扰试验可知，输出线相比于输入线更容易引入干扰，并且电台与电源共地，能够提高一定的抗干扰能力，但受试设备的敏感规律不变，电台浮地会大大降低临界干扰场强。

Analysis on restart effect of communication station under strong field irradiation interference of out-band continuous wave

In order to study the irradiation effects on switching power supply and communication station, an experiment is carried out by using out-band continuous wave as jamming signal. The effect of restart appears when the communication station is under out-of-band strong field interference. The main reason is the influence of out-of-band continuous wave jamming on the normal operation of switching power supply, which results in its output voltage drop. When the power supplys voltage drops to a certain extent, the station will be shut down. Eliminating the interference, the station will restart and turn back to normal station automatically. As equipment under test(EUT), the switching power supply and communication station have various susceptibility to continuous wave jamming at frequency from 20 to 100 MHz. When the jamming signal frequency is 70 MHz, the EUT is most susceptible. And the half wavelength of the 70 MHz signal is similar to the cable length, which indicates that the coupling channel here is the cable. The station is ineffective to sensitive frequency and critical interference E-field strength as a frequency equipment.