论文部分内容阅读
在动目标显示(MTI)雷达滤波器的实现中,已经表明主目标信号进入后面的距离单元有某些模糊。当多普勒频率接近通带边缘时,模糊效应增强并且在实际的滤波器中是严重的,因为其要求大量的电荷耦合器件级即要求大量的距离单元。这些影响被认为是滤波器的设计中存在反馈环的缘故,其中假信号的增长以与电荷耦合器件视频累积器中同样的方式产生。时域中电荷耦合器件视频累积器的分析给出二次信号增长的详细数值。二次信号是环路增益、转移损耗和转移数的函数。本文介绍该分析推广到输入信号具有正弦变化的情况(如在具有与时钟同步的输入信号的动目标显示滤波器中的情况)。它给出递归滤波设备时域和频域分析之间的关系,这些结果能应用到这样的滤波器的工程设计中。本文将叙述某些实验的结果。
In the realization of a moving target display (MTI) radar filter, it has been shown that there is some ambiguity in the distance unit behind the main target signal. As the Doppler frequency approaches the passband edge, the blur effect is enhanced and is severe in practical filters because it requires a large number of charge-coupled device stages that require a large number of distance elements. These effects are thought to be due to the presence of a feedback loop in the design of the filter, where the growth of glitches is generated in the same way as in the video accumulator of a charge-coupled device. The analysis of the video accumulator in the charge coupled device in the time domain gives a detailed numerical value of the secondary signal growth. Secondary signals are a function of loop gain, transfer loss, and transfer number. This article describes the analysis extended to cases where the input signal has a sinusoidal variation (as in a moving target display filter with an input signal synchronized with the clock). It gives the relationship between the time-domain and frequency-domain analysis of recursive filtering devices, and these results can be applied to the engineering of such filters. This article will describe the results of some experiments.