一种气象雷达对数中频放大器的设计

摘要

对气象雷达接收机而言,动态范围是其重要参数之一,其大小直接决定了雷达接收机探测小信号和大信号的能力。然而,如果中频接收采用线性放大器进行设计,接收机对于大信号的探测往往由于接收机产生饱和而丧失探测能力,因此采用对数放大器是一种很好的解决方案。本文介绍了一种对数中频放大器的设计方法。该放大器是一种用于动目标显示雷达接收机的性能优良的双增益对数中频放大器。%For the weather radar receiver the dynamic range is one of the important parameters. Dynamic range directly determines the ability of the radar receiver detecting small signal and large signals. However, if the IF receiver design uses a linear amplifier, the detection of large-signal often leads to nil because of the saturation of receiver. The method of logarithmic amplifier is a good solution. In this design, the method of a logarithmic IF-amplifier is introduced. This kind of amplifier uses dual-gain IF amplifier with excellent performance for moving targets indication.