无人机数据链电磁干扰机理和防护研究

针对无人机在飞行过程中其数据链系统容易受到外界电磁干扰而导致链路中断的问题，以某型无人机数据链系统为研究对象，提出了一种基于前门耦合的电磁敏感度注入效应试验方法。基于该方法开展了某型无人机数据链系统电磁敏感度效应试验，得到了该数据链系统的敏感度阈值曲线，确定了其电磁敏感度阈值，分析了机载数据链接收机射频前端的工作原理和电磁干扰作用下接收机的信号传输过程，揭示了组合频率干扰和带外饱和干扰对无人机机载数据链的作用机理，最后进行了试验验证。在实验研究的基础上，从电磁兼容设计层面和自适应控制策略方面分别有针对性地提出了相应的防护方法。

Mechanism and protection on the data link of UAV exposed to electromagnetic interference

To solve the problem that the data link of the unmanned aerial vehicle (UAV) is vulnerable to electromagnetic interference during the flight and cause the link interruption, we took a certain data link of UAV as our research object, and proposed an experimental method of injection effect based on front door coupling. On this basis, we developed the effect experiment for the data link of UAV. We derived the sensitivity threshold curve of the data link and determined the sensitivity threshold, analyzed the work principle of RF front end circuit of the data link and the signal transmission process of the receiver under the effect of electromagnetic interference, revealed the mechanism of combined frequency interference and out of band saturation interference on data link, and finally carried out the experimental verification. Based on the test results, we put forward the corresponding protective methods from the aspects of the circuits level and adaptive control respectively.