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收发组合作为无人机数据链系统的核心部件,其抗电磁干扰能力直接影响机载通信安全。为检验核电磁脉冲(HEMP)辐照条件下某型无人机数据链系统的可靠性,基于快沿电磁脉冲模拟系统建立了无人机HEMP效应试验平台,以典型“失锁”效应作为受干扰判别依据,开展了无人机数据链系统辐照效应研究,分析了无人机数据链“失锁”效应机理。结果表明:核电磁脉冲场强达到72 k V/m时能够对飞机数据链测试系统产生干扰,导致地面监视系统回报通信链路全部失锁、飞行控制模拟器黑屏,且收发组合放置姿态改变基本不影响数据链系统干扰阈值。通过电磁仿真分析发现,飞行控制模拟器端接电缆耦合外界强场信号使收发组合供电瞬时中断,进而导致数据链测试系统产生干扰。排除数据链测试系统中飞行控制模拟器,在辐照场强<90 k V/m情况下,无人机下行遥测链路不会出现失锁。
As a key component of the UAV data link system, the combination of sending and receiving has a direct impact on the safety of airborne communications due to its anti-electromagnetic interference capability. In order to test the reliability of a type of UAV data link system under the irradiation of nuclear electromagnetic pulse (HEMP), a test platform of UAV HEMP effect was established based on fast electromagnetic pulse simulation system. The typical “lost lock” effect As the basis of interference identification, the research on the radiation effect of the UAV data link system was carried out and the mechanism of the “lost lock” effect of the UAV data chain was analyzed. The results show that the nuclear electromagnetic pulse field strength up to 72 kV / m can interfere with the aircraft data link test system, causing the ground monitoring system to report the loss of all communication links and the flight control simulator with black screen, Does not affect the data link system interference threshold. Through the electromagnetic simulation analysis, it is found that the terminal of the flight control simulator is coupled with the external strong field signal so that the receiving and dispatching combined power supply is interrupted instantaneously, which leads to the interference of the data link test system. Excluding the flight control simulator in the data link test system, the UAV downlink telemetry link will not lose lock under the irradiation field strength <90 kV / m.