某型无人机测控设备接收灵敏度异常故障分析

Analysis of abnormal receiving sensitivity of a certain type of UAV measurement and control equipment

针对某型无人机飞行过程中机载测控设备接收灵敏度异常问题,建立了接收灵敏度下降故障树,通过对故障进行分析,给出了故障分析与定位的过程,提出相应改进措施。结果表明,在无人机进行正常操作时,由于电磁干扰作用,在机载设备供电端会产生瞬变幅度峰值及持续时长并不固定的电源瞬变,瞬变正尖峰可达20.5 V,瞬变持续时长可达182μs。如机载设备供电采用共地设计,电磁干扰信号会与-28 V地构成电源回路,使用过程中可能会造成器件损坏,将供电设计更改为浮地方式能够有效解决此问题。

Aiming at the abnormal problem of receiving sensitivity of airborne measurement and control equipment in the flight of a certain type of unmanned aerial vehicle, the fault tree of receiving sensitivity decline is established. Through the analysis of the fault, the process of fault analysis and location is given, and the corresponding improvement measures are put forward. The results show that during the normal operation of the UAV, due to the electromagnetic interference, there will be transient power supply at the power supply terminal of airborne equipment, and the transient peak can reach 20.5 V, the transient duration can be up to 182 μs. If the common ground design is adopted for the power supply of airborne equipment, the electromagnetic interference signal and the negative pole of-28 V power supply will form power loop, which may cause device damage during use. Changing the power supply design to non-common ground mode can effectively solve this problem.