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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 the problem that the electromagnetic radiation of the on-air photoelectric platform exceeds the standard, interfere with other electronic devices, find the radiation emission and conduction emission source of the photoelectric platform and analyze the generation mechanism of the radiation emission and the conduction emission exceeding the standard, it provides theoretical guidance for the electromagnetic compatibility design of the photoelectric platform. The periodic pulse signal and the spectral structure of the periodic trapezoidal pulse signal which is closest to the clock signal and the digital signal in the actual electronic circuit are analyzed. The periodic pulse signal and periodic trapezoidal pulse signal contain a large amount of high-frequency spectral components, the faster the signal changes, that is, The faster the pulse rises / falls, the more the high frequency components of the signal. According to the characteristics of the periodic pulse signal, the signal spectrum characteristics of the components of the photoelectric reconnaissance platform are analyzed, and the main radiation emission and conduction emission source of the optical platform are found. Using spectrum analyzer to test the electromagnetic radiation of each component of photoelectric reconnaissance platform, which is consistent with the theoretical analysis. Based on the characteristics of the spectrum emission of the radiation source, practical and effective improvement measures are taken for different emission sources to make the photoelectric reconnaissance platform meet the requirements of GJB151A- 97 provisions of the Navy aircraft extracavity equipment electromagnetic radiation emission requirements.