机载光电侦察平台EMC环境频谱研究

Spectrum research of airborne opto-electronic reconnaissance platforms EMC environment

为了解决机载光电平台电磁辐射超标、干扰其他电子设备的问题,寻找光电平台的辐射发射和传导发射源,分析辐射发射和传导发射超标的产生机理,为光电平台进行电磁兼容设计提供理论指导。分析了周期性脉冲信号以及与实际电子线路中时钟信号、数字信号最接近的周期梯形脉冲信号的频谱结构,周期脉冲信号和周期梯形脉冲信号含有大量的高频频谱分量,信号变化越快,即脉冲的上升/下降时间越快,信号的高频分量越多。根据周期脉冲信号的这一特点,分析了光电侦察平台各组成部分的信号频谱特点,找到了光电平台的主要辐射发射和传导发射源。用频谱分析仪测试光电侦察平台各组成部分的电磁辐射情况,与理论分析情况一致,根据辐射源的频谱发射特点,针对不同的发射源采取了切实有效的改进措施,使光电侦察平台满足GJB151A-97中规定的海军飞机舱外设备电磁辐射发射要求。

In order to solve airborne opto-electronic platform electromagnetic radiation electronic equipment, looking for radiation and conduction emission source of exceeding interfere with other the airborne opto-electronic reconnaissance platform , analyze the generation mechanism of radiation and conduction emission exceeding, to provide theoretical guidance for EMC for opto-electronic platform. This article analyzes the periodic pulse signal and the clock signal with the actual electronic circuits, the spectral structure of the digital signal closest periodic trapezoidal pulse signal, a periodic pulse signal and periodic trapezoidal pulse signal contains a lot of high-frequency spectral component, the faster the signal changes the faster, i.e. the pulse rise/fall time, the more high-frequency component of the signal. According to this feature of the periodic pulse signal, analyzes the signal spectral characteristics, of the various components of the optical reconnaissance platform available photoelectric platform main radiated and conducted emission source. The electromagnetic radiation spectrum analysis of each part of the instrument test opto-electronic reconnaissance platforms, consistent with the theoretical analysis of the situation and take effective improvement measures for different emission source based on spectral emission characteristics of the radiation source, the opto- electronic reconnaissance platforms meet GJI3151A-97 under the navy aircraft the extravehicular equipment electromagnetic radiation emission requirements.