Android智能手机GNSS定位性能分析

随着全球卫星导航系统(GNSS)的发展和移动通信技术的进步，用户对位置服务(LBS)提出了更高的要求. 本文采用市面上常见的两部Android智能手机采集GNSS数据，对Android智能手机伪距单点定位(SPP)和单频精密单点定位(PPP)算法进行研究，分析了在不同条件下智能手机的SPP、单频PPP定位性能. 结果表明:在使用多普勒平滑伪距和信噪比随机模型的基础上，Android智能手机GPS单系统的SPP定位精度可达3 m，GPS、Galileo、GLONASS、北斗卫星导航系统(BDS)四系统定位精度可达亚米级. 在单频PPP静态定位中，在GPS单系统下，定位精度仅能达到米级，且收敛时间较长；在GPS、Galileo、GLONASS、BDS四系统下，定位精度可达亚米级，且平面方向可在40 min内收敛. 在单频PPP动态定位中，手机的定位精度仅能达到米级. 

GNSS positioning performance analysis of Android smartphones

With the development of Global Navigation Satellite System (GNSS) and the progress of mobile communication technology, users put forward higher requirements for location services. In this paper, GNSS data are collected by using two Android smart phones that are common in the market, and the algorithms of standard point positioning (SPP) and single frequency precise point positioning (PPP) of Android smartphone are studied. The positioning performance of SPP and PPP of smart phones under different conditions is analyzed. The results show that based on the random model of Doppler smoothing pseudo range and signal-to-noise ratio, The SPP positioning accuracy of Android smart phone GPS single system can reach within 3 m, and the positioning accuracy of GPS、Galileo、GLONASS、BDS four system can reach sub meter level. In single frequency PPP static positioning, under the single GPS system, the positioning accuracy can only reach meter level, and the convergence time is long; Under GPS、Galileo、GLONASS、BDS four system, the positioning accuracy can reach sub meter level, and the plane direction can converge within 40 min. In single frequency PPP dynamic positioning, the positioning accuracy of mobile single frequency PPP can only reach meter level.