Electromagnetic effect analysis of UAV positioning system based on disturbance sequence diagram
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摘要: 无人机定位系统是无人机与外部环境进行信息交互的重要核心模块，同时也为电磁干扰信号提供了耦合路径。围绕无人机定位系统电磁效应分析展开研究，关注未采取电磁加固措施的消费级无人机，基于无人机定位系统内部结构，建立了无人机定位系统的干扰序列图，进而推导出无人机定位系统各模块的瞬态响应函数，基于干扰序列图构建了无人机定位系统物理模型，开展了定位系统电磁效应场路联合分析，仿真分析了定位系统及其敏感单元磁场强度H和磁感应强度B的分布与规律，得到了无人机定位系统的电磁效应分布特征与电磁薄弱环节。仿真结果表明：无人机定位系统电磁薄弱环节在芯片线路连接点处，且随着电磁脉冲干扰时间的增加，电磁效应持续累积且呈现趋势一致的震荡效应。Abstract: The UAV positioning system is an important core module for the information interaction between the UAV and the external environment, it also provides a coupling path for electromagnetic interference signals. Based on the internal structure of the UAV positioning system, the interference sequence diagram of the UAV positioning system is established, then the transient response function of each module of the UAV positioning system is derived, the physical model of the UAV positioning system is constructed based on the interference sequence diagram, and the joint analysis of the electromagnetic effect field path of the positioning system is carried out. The distribution and law of the magnetic field strength H and magnetic induction intensity B of the positioning system and its sensitive unit are simulated and analyzed, and the electromagnetic effect distribution characteristics and electromagnetic weak links of the UAV positioning system are obtained. The simulation results show that the electromagnetic weak link of the UAV positioning system is at the connection point of the chip line, and with the increase of the electromagnetic pulse interference time, the electromagnetic effect continues to accumulate and shows a consistent trend of oscillation effect.
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图 1 无人机定位系统电磁脉冲耦合示意图
Figure 1. Schematic diagram of electromagnetic pulse coupling for UAV positioning system
图 4 GPS模块电磁拓扑干扰序列图
Figure 4. lectromagnetic topology interference sequence diagram of GPS module
图 7 GPS模块ANSYS Maxwell仿真环境模型
Figure 7. Establishment of ANSYS Maxwell simulation environment model for GPS module
图 8 100 MHz脉冲源激励下GPS电路子模块云图
Figure 8. GPS circuit submodule cloud image under 100 MHz pulse source excitation
图 9 100 MHz脉冲源激励下GPS模块云图
Figure 9. GPS module cloud image under 100 MHz pulse source excitation
图 10 100 MHz脉冲源激励下敏感点B（磁感应强度）随时间变化曲线
Figure 10. Time variation curve of sensitive point B (magnetic induction intensity) under excitation of 100 MHz pulse source
图 11 500 MHz脉冲源激励下GPS电路子模块云图
Figure 11. GPS circuit submodule cloud image under the excitation of 500MHz pulse source
图 12 500 MHz脉冲源激励下GPS模块云图
Figure 12. GPS module cloud image under the excitation of 500 MHz pulse source
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