一种多径条件下的捕获算法  

A Method for Acquisition Algorithm in Presence of Multipath

作　　者：梁保卫[1] 吴丹[1] 刘志轩[2] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]北京航天长征飞行器研究所,北京100076

出　　处：《无线电工程》2014年第6期73-76,共4页Radio Engineering

摘　　要：针对无人机在飞行过程中由于受到多径干扰的影响,延迟锁定环的鉴相曲线发生严重畸变,进而影响环路跟踪,造成环路失锁的问题,以及传统串行捕获算法重新捕获时间较长等不足,提出了基于数字匹配滤波器(DMF)结构的时间窗捕获算法,介绍了DMF的结构,分析了DMF量化比特数及取样间隔等参数的选取原则,并给出了时间窗捕获算法的详细设计步骤。工程实测结果表明,算法在莱斯信道中捕获速度快且误码性能良好。Aiming at the problem of PD curve distortion in delay locked loop,which leads to losing lock,and the defect of long reacquisition time of traditional serial acquisition algorithm, because of multipath introduced by UAV flying, an acquisition algorithm with time windows based on DMF structure is proposed.First of all,DMF structure is presented,and the selection principle of the param-eters,such as the number of quantization bits of DMF and sampling interval,is analyzed.What’s more,the detailed designing steps of acquisition algorithm with time windows are introduced.The engineering test shows that the algorithm brings not only an advantage of fast capturing,but also good error-bit performance.

关 键 词：匹配滤波器 直扩 无人机数据链 时间窗捕获算法 

分 类 号：TN914[电子电信—通信与信息系统]