摘要
无论GPS接收机的射频和基带参考时钟是否同源,都不会影响伪距定位。然而,对于载波相位平滑伪距定位,本文的理论分析表明:在新增卫星时,射频和基带参考时钟不同源将使新增星和原有星的平滑伪距钟差产生偏差,进而导致大幅度定位误差。在时钟同源和不同源两种条件下,利用自研的GPS基带芯片"航芯2E",开展了大量硬件实验,验证了理论分析的正确性。论文得出的载波相位平滑伪距定位的接收机其射频和基带参考时钟必须同源的结论,对于GPS射频和基带芯片的模块化、系列化的规划和设计具有指导意义。
GPS code pseudorange positioning is not affected no matter whether the reference clocks of RF and baseband are from the same oscillator or not. However, for cartier phase smoothing code pseudorange positioning, theoretical analysis in this paper shows that as some new satellites become visible, a clock bias difference between the new and old satellites＇ smoothed pseudoranges occurs, due to different oscillators used by RF and baseband, and it leads to a considerable positioning error. Under the conditions of the same oscillator and two different oscillators used by RF and baseband, sufficient hardware experiments have been carried out by using the self- developed GPS baseband chip HangXin 2E. The correctness of the theoretical analysis has been verified by the experiment results. In this paper, the conclusion that the reference clocks of RF and baseband must be from the same oscillator makes a guidance sense for planning and design of modularization and serialization of GPS RF and baseband chip.
出处
《信号处理》
CSCD
北大核心
2010年第8期1132-1136,共5页
Journal of Signal Processing
基金
新世纪优秀人才支持计划资助
关键词
载波相位平滑伪距定位
钟差
同源参考时钟
新增卫星
carrier phase smoothing code pseudorange positioning
clock bias
reference clocks from one oscillator
increase satellite
