基于数字中频信道的雷达导引头大动态接收机

The Radar Seeker Receiver with Large Dynamic Range Based on Digital IF Channel

采用数字中频接收信道后,摒弃了传统接收机中的AGC环路,依靠ADC的动态范围和通道增益控制来实现信号的大动态接收和处理,并且在实现大动态同时大大降低了接收机整体增益要求。针对雷达导引头回波信号特点,给出了采用数字中频信道后的雷达导引头整体实现框图,并分析了中频正交采样的实现方法和关键技术。基于ADC的性能指标,分析了增益、噪声系数和动态范围之间的关系,讨论了接收机幅相校正问题,并给出了设计实例。

By utilizing digital intermediate frequency channel,the receiver processes signal in large dynamic range by means of the dynamic range of ADC and adjusting the gain of channel with smaller gain of receiver than the traditional receiver in which the AGC loop circuit is applied and reduces the requirement of receiver integral gain.In allusion to characters of echo wave for radar seeker,the integral realization block diagram of radar seeker based on digital intermediate frequency channel is proposed.It also an...