PHENOMENA OF PAIRED ECHOES AND TRANSMISSION CHARACTERISTICS OF THE PULSE SIGNAL IN DISPERSIVE TRANSMISSION LINES WITH DISCONTINUITIES
PHENOMENA OF PAIRED ECHOES AND TRANSMISSION CHARACTERISTICS OF THE PULSE SIGNAL IN DISPERSIVE TRANSMISSION LINES WITH DISCONTINUITIES
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DOI：
10.2528/pierb08022202
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发表时间：
2008
影响因子：
--
通讯作者：
Y. Gui;W. Dou
中科院分区：
文献类型：
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作者：
Y. Gui;W. Dou
宽带雷达系统的性能可能会因系统传输通道任何地方发生的信号失真而降低。如果宽带信号传输过程中幅度响应不平坦或信号延迟不恒定，则会出现信号失真，从而降低信噪比和分辨率。现有理论表明，线性系统幅频或相频响应中的微小正弦纹波变化都会导致信号失真，并在时域输出信号中出现成对回波现象。本文通过时域有限差分(FDTD)方法和理论分析，讨论了具有不连续性的色散传输线是否会导致成对回波现象。结果表明，成对回波技术不适合分析具有不连续性的色散传输线对时域脉冲信号的影响。应选择泰勒级数展开的方法作为更合适的方法。同时，仿真还表明，脉冲信号在包含滤波器、定向耦合器等无源器件的不连续色散传输线上传输时，不会产生成对回波现象。
The performance of wideband radar system may be degraded by signal distortion occurring in anyplace of the transmission channel of the system. If the amplitude response is not flat or the signal delay is not constant in the transmission of the wideband signal, then signal distortion will occur, which can reduce the SNR and resolution. The available theory indicates that a small sinusoidal ripple variation in either amplitude-frequency or phase-frequency response of a linear system will cause signal distortion and the phenomena of paired echoes in the output signals of the time domain. In this paper, whether a dispersive transmission line with discontinuities will lead to the phenomena of paired echoes is discussed by means of finite difference time domain (FDTD) method and theoretical analysis. The results show that the technique of paired echoes is unsuited to analyze the influence of dispersive transmission line with discontinuities on time domain pulse signal. The method of Taylor series expansion shall be chosen as a more appropriate method. Meanwhile, simulations also show that a pulse signal transmitting in dispersive transmission lines with discontinuities including passive components such as filters and directional couplers will not lead to the phenomena of paired echoes.