摘要
使用电缆传输信号时,常以地面作为传输回路,但是,地面的电气参数不同,对信号的传输效果和负载端设备的影响会有所不同。利用传输线理论,研究在电磁脉冲作用下,以理想地面和有损耗地面作为传输回路的单导体传输线负载端电流响应,获得了两种情况下传输线终端负载处电流的解。采用傅立叶变换和MATLAB仿真,对不同的大地电导率、外场入射角、导线距离地面高度等对传输线负载端电流响应的影响进行分析讨论,结果显示,有损耗地面较理想地面对负载端电流有很大的影响,因此适当增加返回地平面的阻抗有助于提高传输线的抗干扰能力。仿真分析结果为实际系统电缆耦合产生的干扰分析提供了理论依据,并具有一定的参考价值。
The ground is often used for serving as a return conductor in transmitting signal by cables, however, different electrical parameters of ground have different effects on the transmission and load. Using transmission line theory, the terminal load current solutions of transmission line ,which are excited by electromagnetic pulse to the lossy ground or lossless ground as return conductor are derived. Based on Fast Fourier Transform and MATLAB simulation, the load - current response of transmission lines are deeply investigated as the transmission line parameters （ ground conductivity, the incident angle of electromagnetic fields and height from the ground） change. The simulation results show that the lossy ground has more serious effects on responce of load current than the lossless ground. Therefore increasing the impedance of the ground on the transmission lines is helpful to improve disturbance rejection capability of transmission line. The results presented in this article provide some theoretical basis and have a certain reference value to pracrical engineering systems.
出处
《计算机仿真》
CSCD
2008年第1期332-335,共4页
Computer Simulation
关键词
传输线
电磁脉冲
理想地面
有损耗地面
电流响应
仿真
Transmission lines
EMP
Lossless ground
Lossy ground
Current response
Simulation
