Introduction to panel discussion on mobile radio vehicular interference

J. Chappell
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Abstract

Vehicular electrical systems have the inherent capability of generating broad-band type impulsive interference, which, if effective control measures are not taken, will seriously degrade the performance of mobile communications receivers installed in the vehicle or installed in nearby vehicles. Thus we have two distinct problems: one, the interference to the communications receiver by the vehicular carrier; two, interference to the communications receiver from the electrical systems of nearby vehicles. The term broad-band interference describes the spectrum character of this interference which manifests its presence over a broad spectrum of frequencies extending from the very low radio frequencies to at least 1,000 mc. Figure 1 illustrates some of the properties of broad-band impulsive type interference. It will be noted that the idealized case of a pulse of infinite height and infinitesimal duration will result in a uniform spectrum from dc to infinity. More realizable pulses of rectangular and triangular shape respectively would have a spectrum such as shown in the lower portion of Figure 1. It will be noted that the spectrum amplitude, in the flat portion of the spectrum is substantially a function of only the volt-time area of the pulse, whereas at the higher frequencies the spectrum amplitude is a function of both the volt-time area and the pulse shape.
移动无线电车辆干扰小组讨论简介
车载电气系统具有产生宽带型脉冲干扰的固有能力,如果不采取有效的控制措施,将严重降低车载或附近车辆的移动通信接收机的性能。因此,我们有两个截然不同的问题:一是车载载波对通信接收机的干扰;二是附近车辆电气系统对通信接收机的干扰。术语“宽带干扰”描述了这种干扰的频谱特征,这种干扰表现出其存在于从极低的无线电频率延伸到至少1000毫克的广谱频率上。图1说明了宽带脉冲型干扰的一些特性。我们将注意到,在理想情况下,具有无限高和无穷小持续时间的脉冲将产生从直流电到无穷大的均匀光谱。更容易实现的矩形脉冲和三角形脉冲分别具有如图1下部所示的频谱。可以注意到,在频谱的平坦部分,频谱幅度实质上仅是脉冲的电压时间面积的函数,而在更高的频率,频谱幅度是电压时间面积和脉冲形状的函数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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