基于基带信号包络的数字AGC设计与实现  

Design and Implementation of Digital AGC Based on Baseband Signal Envelope

作　　者：裴军[1] 胡正群[1] 杜晓辉[1] 

机构地区：[1]中国科学院国家天文台,北京100012

出　　处：《电讯技术》2010年第7期119-122,共4页Telecommunication Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2007CB815504)~~

摘　　要：在卫星扩频通信系统中,通常采用自动增益控制(Automatic Gain Control,AGC)技术解决大动态的信号起伏和干扰,以实现扩频信号的快速捕获和跟踪。分析了扩频接收机基带信号数字采样门限,通过用信号包络功率值作为AGC控制信号,实现了接收基带信号大动态范围的信号处理,完成了数字AGC自适应控制。利用扩频信号进行完全捕获后的包络信号作为AGC信号可以有效防止信号捕获过程中多普勒频移等引起的失锁和误捕,实现扩频接收机RF(射频)信号大动态范围的信号控制。In satellite spread-spectrum communications systems, automatic gain control（AGC）technique is commonly used to solve the large dynamic range against the signal fluctuating and interference. In this paper, the digital sampling threshold for spread spectrum signal is analyzed, as a result, the spread spectrum signal power envelope is used to complete the digital AGC, and the signal power envelope in the signal acquisition phase pre- vents from losing and mistaking signal acquisition caused by Doppler frequency shift and can realize adaptive RF receiving signal control in large dynamic range.

关 键 词：卫星通信 扩频信号 数字自动增益控制 门限 

分 类 号：TN927[电子电信—通信与信息系统]