单通道角跟踪系统接收机AGC控制环路设计

摘要

单通道角跟踪系统中角误差信息通常以调幅的形式调制在接收信号包络上，接收机AGC电路必须能够补偿由于传输距离变化引起信号电平起伏，而不引入角误差信息失真。文中采用拉普拉斯变换方式对采用两阶环路滤波器的AGC电路进行分析，得到了电路输出信号以及其失真与输入信号和环路参数的关系。进一步研究表明根据信号传输电平变化最大变化率，合理的设计单脉冲调制速率和环路滤波器的参数，AGC电路能够准确补偿信号传输引起的信号电平变化而几乎不会引入角误差信息失真。%Auto gain control circuits of receivers in single channel angle tracking systems must keep output power in constant along with input power changing due to transmission distance varying, but not distort the angle deviation signal, which usually modulates antenna receival’s amplitude. After an auto gain control loop model of the receivers is analyzed, the relations of output and its distortion to input and loop filter’s parameter are released. With a further research, it comes to a conclusion that AGC loop can accurately keep output’s power in constant almost without distorting the angle deviation signal, as proper design parameters are employed.