AGC稳定时间对DS/FH系统捕获的影响

Influence of AGC Settling Time on Acquisition of DS/FH System

针对直扩/跳频(DS/FH)通信系统越来越广泛的工程应用,简要介绍了DS/FH系统同步捕获过程及其接收自动增益控制(AGC)电路稳定时间的概念,分析仿真了DS/FH系统信号作用于AGC电路的前后变化,重点论述了AGC环路稳定时间选取不当时,会引起AGC输出信号失真,影响后级终端电路的同步捕获性能。最后依据此失真对终端捕获的影响机理提出了AGC稳定时间的选取方法,并在工程实际中得到了验证。

Aiming at widely engineering application of DS/FH communication systems, this paper introduces briefly the DS/ FH system synchronization acquisition process and settling time of receiving automatic gain control circuit. It analyzes and simulates the process that DS/FH signals act on the AGC circuit. It is particularly discussed that incorrect settling time of AGC will cause the AGC output signal to distort and influence the synchronization acquisition function of terminal circuit. Finally, based on this distortion, the methods of selecting AGC settling time are proposed and they are validated in the engineering practice.