国防科技大学学报Issue(3)：51-55,5.DOI:10.11887/j.cn.201503009
卫星导航接收机延迟锁定环鉴相器有限字长分析
Analysis of finite word length effect on delay-locked loop discriminator in GNSS receiver
摘要
Abstract
Code phase discriminator is the important part of the delay-locked loop,so its performance affects the pseudo-code tracking precision of receiver directly.Aim at influence of the input signal’s finite word-length effect on the discriminator’s performance,a new method based on signal statistical character was proposed and the effect of input signal ’s finite-word length of unified early minus late amplitude discriminator on output performance was analyzed.Analysis and simulation show that the influence of input signal’s finite word-length effect in the case of high SNR(Signal-to-Noise Ratio)is more obvious than in the case of low SNR.The loss of pseudo-code tracking precision caused by finite word length increases as the increasing of input signal’s SNR.The deviation of the code phase discriminator with up to 4 bits almost has not influence on the pseudo-code tracking accuracy.This conclusion can be used to guide the low power and miniaturization design of receiver.关键词
鉴相器/延迟锁定环/归一化早迟幅度鉴相器/有限字长/跟踪精度Key words
discriminator/delay-locked loop/unified early minus late amplitude discriminator/finite word length/tracking precision分类
信息技术与安全科学引用本文复制引用
刘小汇,李峥嵘,欧钢..卫星导航接收机延迟锁定环鉴相器有限字长分析[J].国防科技大学学报,2015,(3):51-55,5.基金项目
航天支撑基金资助项目 （）
