两种不同方式智能手机伪距平滑分析

Analysis of two different smartphone pseudo-range smoothing methods

针对智能手机受导航芯片和天线接收器限制、伪距观测值精度不高、粗差较多等问题,本文提出利用各观测量进行历元间求双差,以探测观测值中的粗差并予以剔除,再结合多普勒观测值和载波相位观测值平滑伪距,从数据质量和伪距平滑两方面分析影响智能手机定位精度的原因,说明智能手机载波相位观测值和多普勒观测值平滑伪距的可用性。试验结果表明:智能手机载波相位平滑伪距可有效提高定位精度;多普勒观测值平滑伪距定位精度与导航芯片获取的多普勒观测值有关,小米MI8多普勒观测值精度优于华为P30。

Aiming at the problems that smartphones are limited by navigation chips and antenna receivers,the accuracy of pseudorange observations is not high,and there are many gross errors. This paper proposes to use the various measurements to detect double differences among epochs in order to find and remove the gross errors in the observed values,and then use the Doppler observations and carrier phase observations to smooth the pseudo-ranges. The reasons that affect the positioning accuracy of smartphones are analyzed from aspects. And the availability of carrier phase observations and Doppler observations for smoothing pseudoranges are explained. The experimental results show that the carrier phase smoothing pseudorange can effectively improve the positioning accuracy;the Doppler observation smoothing pseudorange positioning accuracy is related to the Doppler observations obtained by the navigation chip,and the MI8 Doppler observations have better accuracy than P30.