智能手机广域差分定位算法研究

Research on wide area differential corrections algorithm with an android smartphone

针对当前智能手机原始观测数据不稳定导致实时定位精度不高,且未对电离层延迟进行较好修正等问题,该文研究了2类3种不同芯片智能手机多普勒平滑伪距对实时广域差分定位影响,可改善数据质量,提升定位精度;在此基础上对比了广播电离层参数改正、实时电离层产品、电离层格网预测文件3种电离层产品对手机广域差分定位精度的影响。结果表明,多普勒平滑伪距可提升广域差分定位精度,相较于平滑前二维和三维精度分别提升了49.3%、47.8%;其次,3种电离层改正产品均能不同程度改善Mi8、P30、P40平面与高程精度,其中,电离层格网预测文件提升U方向定位精度最为明显,对Mi8的高程提升了31.3%。

In terms of current issues of unstable real-time positioning accuracy caused by the current unstable raw observation data of smartphones,and the lack of better correction of ionospheric delay.In this paper,the influence of Doppler smoothing pseudorange on real-time wide-area differential positioning of smart phones with 2 types and 3 kinds of different chips is studied,which can improve data quality and positioning accuracy;On this basis,the effects of broadcast ionospheric parameter correction,real-time ionospheric products and ionospheric grid prediction file on the accuracy of wide-area differential positioning of smartphones are compared.The results show that the Doppler smoothing pseudorange can improve the accuracy of wide-area differential positioning,and the 2 D and 3 D accuracy are improved by 49.3% and 47.8%,respectively,compared with that before smoothing;secondly,the three ionospheric correction products can improve the horizontal and vertical position accuracy of MI8,P30 and P40 to varying degrees.Among them,the ionospheric grid prediction file improves the positioning accuracy of U direction most obviously,which improves the elevation of MI8 by 31.3%.