Frequency-Sharing and Spread-Spectrum Transmission with Large Relative Bandwidth
Frequency-Sharing and Spread-Spectrum Transmission with Large Relative Bandwidth
复制标题
大相对带宽的频率共享和扩频传输
DOI：
10.1109/temc.1978.303653
复制
发表时间：
1978
影响因子：
2.1
通讯作者：
H. Harmuth
中科院分区：
文献类型：
--
作者：
H. Harmuth
无线电传输传统上基于小的相对频率带宽的概念，这允许使用与正弦函数谐振的电路和结构。这种方法没有产生任何问题，直到高分辨率雷达进步到脉冲持续时间在1纳秒的数量级，扩频传输到100 MHz的频带数量级。在这些情况下，使用小的相对频率带宽需要在10 GHz以上的频率下操作。雨和雾的吸收以及高噪声温度使这些高频不太理想。此外，不能使用较低的频带，即使它们在那里并且它们的绝对带宽完全足够;仅仅是对小的相对带宽的不必要的要求阻止了它们的使用。允许在大的相对带宽下工作的概念和设备使得在几百兆赫到大约10千兆赫的最理想的范围内以高达0.1纳秒的分辨率工作雷达成为可能;扩频传输可以在不考虑相对频率带宽的情况下工作。本文主要解释了处理大的相对带宽的设备的发展的动机，因为设备本身已经在文献中讨论，并提供了先进的实验水平。
Radio transmission has been based traditionally on the concept of a small relative frequency bandwidth, which permits the use of circuits and structures that resonate with sinusoidal functions. This approach created no problems until high-resolution radar advanced to pulse durations in the order of 1 ns, and spread-spectrum transmission to frequency bands in the order of 100 MHz. The use of a small relative frequency bandwidth requires in these cases operation at frequencies above 10 GHz. Absorption by rain and fog as well as the high noise temperature, make these high frequencies less desirable. Furthermore, the lower frequency bands cannot be used, even though they are there and their absolute bandwidth is perfectly sufficient; only the unnecessary requirement of a small relative bandwidth prevents their use. Concepts and equipment that allow operation with a large relative bandwidth make it possible to operate radar with a resolution up to 0.1 ns in the most desirable range from a few hundred megahertz to about 10 GHz; spread-spectrum transmission can operate without regard to the relative frequency bandwidth. This paper explains primarily the motivation for the development of equipment handling large relative bandwidths, since the equipment itself has already been discussed in the literature and is available on an advanced experimental level.