一种改进的BOC信号码跟踪环路设计方法  

An Improved Design Method of Code Tracking Loop for BOC Modulation Signals

作　　者：杨文津[1] 赵胜[1] 段召亮[1] 

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

出　　处：《无线电工程》2014年第2期21-23,49,共4页Radio Engineering

基　　金：国家高技术研究发展计划("863"计划)资助项目(2012AA121802)

摘　　要：由于高阶二进制偏移载波调制(Binary Offset Carrier,BOC)信号存在自相关函数多峰值特性,在低信噪比(Signal-to-noise Ratio,SNR)环境下,其解扩后的相关峰分布易受噪声影响造成峰值错乱,严重影响基带码跟踪环路性能和伪距测量精度。介绍了经典BOC信号非相干过超前滞后(Non-correlation Very Early Late Processing,VNELP)码跟踪环路,并对其在低信噪比条件下的跟踪性能进行评估,提出了基于VNELP环路的延时相干支路法对原有码跟踪环路在低信噪比条件下对高阶BOC信号的处理性能进行改进。计算机仿真验证了所提方法的有效性和对原VNELP环路的性能改进效果。As the multi-peaks features exist in the high order Binary Offset Carrier （ BOC ） modulation signals＇ self-correlation functions,the span of correlation peaks after de-spreading is often affected by the noise with a low Signal-to-noise Ratio （ SNR）, it makes a strong impact on the performance of the code tracking loop and the accuracy of the pseudo-range.This paper introduces the classic tracking loop called Non-correlation Very Early Late Processing （VNELP） for the BOC modulation signals, evaluates the track- ing performance of loop in low level SNR, and puts forward a delay accuracy branch method based on VNELP code tracking loop to make the loop processing performance for high order BOC modulation signals get better with a low SNR.The computer simulation results show that this method is feasible and can effectively improve the performance of VNELP loop.

关 键 词：码跟踪环路 BOC 测距精度 延时相干 VNELP 

分 类 号：TN911.3[电子电信—通信与信息系统]