扩频接收基带动态范围分析与探讨  

Spread Spectrum Receiver′s Dynamic Range:Analysis and Discussion

作　　者：胡正群[1] 张杰[1] 施浒立[1] 裴军[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11期100-103,共4页Telecommunication Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2007CB815500);国家自然科学基金资助项目(61001109)~~

摘　　要：接收信号动态范围已成为衡量接收基带性能的重要指标。对扩频卫星导航通信系统中的扩频通信接收基带动态范围从物理角度用数学方法进行了分析,阐述了扩频接收基带前端的射频系统对接收基带正常工作的影响,对扩频接收基带信号捕获门限进行了探讨分析,重点利用AD8310芯片设计了扩频接收基带自动增益控制(AGC)接口参考电平,可以实现扩频接收基带射频(RF)信号大动态范围的信号检测和控制。The dynamic range of received signal has become the important measurement index of receiver baseband performance.In the satellite navigation and communications system,the dynamic range of spread spectrum receiver baseband is analysed with mathematical methods from physical point of view.The effect of the spread spectrum receiver baseband′s front-end RF system on the normal operation of receiver is explained,the spread spectrum receiver baseband′s signal acquisition threshold is discussed.Especially,AD8310 is used as the interface reference electric level of AGC（automatic gain control） to realize RF receiving signal control in large dynamic range.

关 键 词：卫星导航 扩频通信 基带 动态范围 三阶交调 虚警概率 

分 类 号：TN386[电子电信—物理电子学]