接收机变频器自动增益控制技术实现

Automatic gain control technology of receiver inverter is realized

常规的接收机变频器自动增益控制是基于前馈控制,其抗干扰能力较差,影响信号处理速率。为了解决这个问题,设计一种接收机变频器自动增益控制技术。在接收机变频器中引入电压比较器,通过电压比较器获取误差信号,进行自动增益误差值计算并输出,使用误差定标器对误差值进行处理生成增益控制信号,环路滤波器检测到增益控制信号后进行内部处理,控制增益变化。测试结果表明:在存在干扰的情况下,与常规的基于前馈的控制方法相比,引入比较器的控制方法的信号处理速率受到的影响较小,抗干扰能力强。

Conventional receiver inverter automatic gain control is based on feedforward control,and its anti-interference ability is poor,which affects the signal processing rate.In order to solve this problem,an automatic gain control technology of receiver inverter is designed.A voltage comparator is introduced into the receiver frequency converter,and the error signal is obtained through the voltage comparator to calculate and output the automatic gain error value.The error value is processed by the error scaler to generate the gain control signal.After the loop filter detects the gain control signal,the internal processing is carried out to control the gain change.The test results show that in the presence of interference,compared with the conventional feedforward control method,the control method with comparator has less influence on signal processing rate and strong anti-interference ability.