摘要
针对传统的多径误差分析方法难以对信号体制设计提供直接的理论指导,提出有限带宽条件下码跟踪多径误差的理论分析方法.在小误差假设条件下,基于线形等效模型推导了多径误差包络的理论表达式,并进行了仿真验证.仿真结果表明,当多径直达信号幅度比(MDR)为-10 dB时,该理论分析方法的偏差小于3%.在相关器间隔趋于0的极限条件下,给出了多径误差包络的理论下界表达式.结果表明:多径误差包络的理论下界取决于多径直达信号幅度比、导航信号自相关函数的一阶导数、导航信号的Gabor带宽以及波动函数;增大信号带宽和增加信号功率谱的高频分量可以减小码跟踪多径误差.
A theoretical analysis method for code tracking multipath error under band limited conditions was presented. Using linear model based on small error assumption, theoretical approximation expression for multipath error envelope was derived. Simulation results show that the difference between theoretical approximation and simulation is less than 3 % when multipath-to-direct ratio （MDR） is -10 dB. A theoretical lower bound expression was also supplied under assumption that the correlator spacing approaches 0. It indicates the lower bound is determined by MDR, first derivative of navigation signal autocorrelation, Gabor bandwidth of navigation signal and fluctuation function. Theoretical analysis results showed that increasing signal bandwidth and high frequence component of signal power spectrum will lead to superior multipath rejection performance.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第5期1-4,13,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
关键词
导航系统
多径传播
码跟踪
误差分析
多径直达信号幅度比
navigation system
multipath propagation
code tracking
error analysis
multipath-to-direct ratio （MDR）
