摘要
分析了射频与基带时钟不同源对载波相位测量的影响,构建了由晶振各类误差源引起的载波环跟踪误差模型。分析与实验结果表明,时钟不同源会导致载波相位测量出错,晶振引起的载波环测量误差随环路噪声带宽增大而减小,减小晶振的h系数和g灵敏度可提高测量精度。选用单一稳定度高、g灵敏度小的晶振作为GNSS接收机时钟,可改善载波相位精度。
We have done some analysis about the effects of two separate oscillators in RF and in baseband on carrier-phase measuring. And we propose a model for the error of carrier- tracking loop, which is based on all kinds of oscillator＇s error sources. The analysis and ex- perimental results show that two different clock sources could result in carrier phase meas- urement error, and the carrier-tracking loop measurement error caused by oscillator could be reduced by increasing the loop noise bandwidth. Moreover, that measurement accuracy can also be advanced by reducing h-factor and g-sensitivity. Additionally, the measurement qual- ity of carrier phase could be improved by adopting a single highly stable and low g-sensitivity oscillator in choosing the GNSS receiver clock.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2012年第12期1413-1416,1447,共5页
Geomatics and Information Science of Wuhan University
基金
国家973计划资助项目(2009CB724002)
国家863计划资助项目(2011AA120503)
国家自然科学基金资助项目(41174028)
作者简介
第一作者简介：张提升，博士生，从事GNSS接收机与组合导航技术研究。E—mail：zhangtishengl@163．com.
