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红外测角跟踪仪的特点是利用目标发射的红外辐射来探测目标,因而测角精度高,抗干扰性能好。放大器是测角仪一个重要组成部分,它的功能是放大探测器敏感的微弱信号,通过选频网络提高信噪比。并按照一定要求实现自动增益控制,使随动系统工作在最佳状态。所以放大器的设计除了低噪声要求之外,也要采用系统设计原则。本文主要阐述前置放大级、选频网络及自动增益控制的设计原则,并经过多次野外跟踪试验,证明该放大器工作稳定,噪声很低,和微波雷达配合取得了较满意的跟踪结果。
Infrared goniometer tracker is characterized by the use of infrared radiation emitted by the target to detect the target, and therefore high accuracy angle, anti-jamming performance. Amplifier is an important part of the goniometer, its function is to amplify the detector-sensitive weak signal, through the frequency-selective network to improve signal-to-noise ratio. And in accordance with certain requirements of automatic gain control, the servo system in the best condition. Therefore, the design of the amplifier in addition to low noise requirements, but also the use of system design principles. This paper mainly describes the design principles of pre-amplification stage, frequency-selective network and automatic gain control. After several field tests, it is proved that the amplifier has stable operation and low noise. Satisfactory tracking results are obtained with microwave radar.