锁相环路中扫描捕获方法及性能分析  

Analysis of Scanning Acquisition Technique and Performance in PLL

作　　者：齐军[1] 

机构地区：[1]西安卫星测控中心,陕西西安710043

出　　处：《无线电工程》2006年第12期38-39,共2页Radio Engineering

摘　　要：锁相环中的扫描捕获是航天测控工程中常用的一种重要技术。分析了具备扫描捕获电路锁相环的工作原理和实现方法。介绍了2种具有扫描捕获电路的锁相环,即具有相干检测电路和积分扫描电路的锁相环和具有辅助鉴相器和扫描发生器的锁相环,并比较了电路各自的优缺点。重点分析了环路参数对捕获性能的影响以及扫描速率与捕获时间的关系。Scanning acquisition in phase locked loop is an important technique in the aerospace measurement and control project. The operating principle and implementation method of PLL, which has scanning acquisition circuits, are analyzed in this paper. Two PLLs are introduced,one has coherent detection circuit and integral scanning circuit, the other has assistant phase-comparator and scanning generator, and their merits and demerits are compared. It deeply analyzes the effect of loop parameters on acquisition ability and the relation between scanning rate and acquisition time.

关 键 词：锁相环 扫描速率 捕获性能 

分 类 号：TN911.8[电子电信—通信与信息系统]