飞行器GNSS接收机静电放电干扰效应分析

Analysis on the interference effect of electrostatic discharge of GNSS receiver on aircraft

针对飞行器全球卫星导航系统接收机易受静电放电干扰的问题,研究了机体表面电晕放电与机务维修火花放电对接收机的干扰效应。分析了静电放电的时频域特征,使用针球电极与高压源组成的模拟器开展了电晕放电对接收机的前门耦合实验,证明了电晕脉冲产生的辐射场对接收机无明显干扰效应。基于人体金属ESD模型开展了火花放电对接收机的干扰效应实验,发现浪涌电流易导致接收机串口转换芯片电位波动,读写程序主循环卡死,应针对串口端进行静电阻抗器防护。

Aiming at the problem that the Global Navigation Satellite System(GNSS)receiver is susceptible to ESD,the interference effect of the corona discharge on the surface of the aircraft and ESD generated by maintenance on the receiver are studied.The time-frequency domain characteristics of the ESD is analyzed.The front door coupling experiment of corona discharge to the receiver was carried out using a simulator composed of a needle ball electrode and a high voltage source.It is proved that the radiation field generated by the corona pulse has no obvious interference effect on the receiver.Based on the human body metal ESD model,the experiment of the interference effect of spark discharge on the receiver was carried out.It was found that the surge current easily caused potential fluctuation of the serial port conversion chip of the receiver,and the main loop of the read/write program was stuck.ESD protection should be performed for the serial port.