射频连续电磁波对某数字电路的辐照效应研究

Research on Radiation Effect of Continuous RF Electromagnetic Wave to a Digital Circuit

在GTEM室中用射频连续波对某导弹装备上的一块数字控制电路进行电磁辐照,在一定的场强下,引入的电磁干扰还未导致被监测的与非门产生错误反转时,产生控制信号的自激多谐振荡器却首先受到了电磁干扰,主要表现为产生的方波控制信号的占空比增大。分别研究了波源频率在245 MHz和330 MHz的情况下电路受干扰的情况,辐照实验分别对待测设备按水平横向放置、水平纵向放置和竖直放置3种放置方位分别进行了辐照。最后对水平横向放置的两个频点,将方波控制信号的占空比随场强的变化进行了相关性拟合,建立了数学模型。

A digital control circuit of a missile equipment was radiated by continuous RF（ radio frequency）wave in a GTEM cell. Under certain field intensity, although the electromagnetic disturbance basnt made the NAND gate monitored produce wrong overturn, the free - running muhivibrator which is used to produce control signal is seriously interfered. It was showed that the duty ratio of rectangular wave signal has augmented. The interference was studied at 245 MHz and 330 MHz disturbance source. The equipment under test was radiated when it was put in three directions： the horizontal transverse direction, the horizontal longitudinal direction, and the vertical direction. At last correlation fitting was done to the change of duty ratio of the rectangular wave with the intensity of the field at each frequency of the horizontal transverse direction. A mathematical model was established.