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无线电传输中人们一直传统地采用小相对频率带宽的概念,小相对带宽允许采用谐振于正弦函数的各种电路和结构。当高分辨力雷达的脉冲宽度在1毫微秒和扩展谱的传输频带在100兆赫的量级以内时,这种传统概念的应用是不成问题的,这时,应用小相对频率带宽就要求工作频率在10千兆赫以上,由于雨和雾的吸收衰减作用和高噪声温度,使用这样高的工作频率是不合适的。另外,较低频段的工作频率也就不能被利用,因为即使它能实现而且其绝对带宽也合乎要求,但仅仅由于这时小相对带宽这个不必要的要求而阻碍了低频段的使用。应用了大相对带宽的概念及其所工作的设备可以使雷达具有高达0.1毫微秒的分辨力,而且仍在几百兆赫到大约10千兆赫最合适的频段内工作;扩展谱传输可以不考虑相对频率带宽。本文主要阐明研制这种大相对带宽处理设备的目的,因为设备本身已有文献讨论过,并且已达到了先进的实验水平。
People have traditionally used the concept of small relative frequency bandwidth in radio transmission, and the small relative bandwidth allows the use of various circuits and structures that resonate with sinusoidal functions. The application of this traditional concept is not a problem when the pulse width of a high-resolution radar is within 1 nanosecond and the propagation band of the spread spectrum is on the order of 100 megahertz. In this case, the application of small relative frequency bandwidth requires work At frequencies above 10 gigahertz it is not appropriate to use such a high operating frequency due to the absorption and attenuation effects of rain and fog and the high noise temperature. In addition, the operating frequency of the lower frequency band can not be utilized because even if it can be achieved and its absolute bandwidth is satisfactory, the use of lower frequencies is only hindered by the unnecessary requirement of a small relative bandwidth. The concept of large relative bandwidth and the devices it operates on offer resolution up to 0.1 nanoseconds for the radar and still operate in the most suitable frequency range from a few hundred megahertz to about 10 gigahertz; extended spectral transmission may not be considered Relative frequency bandwidth. This article mainly illustrates the purpose of developing such a large relative bandwidth processing equipment, because the equipment itself has been discussed in the literature, and has reached the advanced experimental level.