小米Mi8智能手机上的单双频四星座GNSS精确点定位方法

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-04-19 DOI:10.1017/S0373463322000145

Yanjie Li, C. Cai

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引用次数: 3

摘要

近年来，智能手机上的高精度全球卫星导航系统(GNSS)定位技术引起了越来越多的关注。然而，智能手机内置的低成本GNSS芯片和线性极化天线导致数据缺乏和质量下降，阻碍了智能手机上的高精度GNSS定位。本研究提出了一种单频和双频混合四星座精确点定位(MSDQ-PPP)模型，利用所有可用的GNSS观测值提高智能手机上的定位性能。使用b小米Mi8智能手机进行静态和运动学测试，以全面评估MSDQ-PPP性能，并与单频PPP (SF-PPP)和双频PPP (DF-PPP)模型进行比较。静态测试结果表明，MSDQ-PPP在水平和垂直方向上均可达到0⋅39 m和0⋅50 m的精度水平，大多数会话的收敛时间小于10 min。与DF-PPP相比，MSDQ-PPP在水平方向和垂直方向的定位精度分别提高了53%和31%。与SF-PPP相比，定位精度和收敛时间在水平方向上分别提高62%和90%。在运动测试中，MSDQ-PPP在水平和垂直方向上的精度分别为0⋅7 m和1⋅5 m。与DF-PPP相比，准确率提高了78%和76%，与SF-PPP相比，准确率提高了13%和38%。静态和运动MSDQ-PPP测试均表明定位性能显著增强。

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A mixed single- and dual-frequency quad-constellation GNSS precise point positioning approach on Xiaomi Mi8 smartphones

Abstract The high-precision global navigation satellite system (GNSS) positioning technique on smartphones has been attracting increasing interest in recent years. However, the low-cost GNSS chip and linearly polarised antenna embedded inside smartphones result in data lack and quality degradation, which hinders the high-precision GNSS positioning on smartphones. In this study, a mixed single- and dual-frequency quad-constellation precise point positioning (MSDQ-PPP) model is proposed to improve the positioning performance on smartphones by taking advantage of all available GNSS observations. Static and kinematic tests were made using a Xiaomi Mi8 smartphone to fully assess the MSDQ-PPP performance with comparisons to single-frequency PPP (SF-PPP) and dual-frequency PPP (DF-PPP) models. The static test results show that the MSDQ-PPP can reach an accuracy level of 0⋅39 m and 0⋅50 m in the horizontal and vertical directions with a convergence time of less than 10 min in most sessions. The MSDQ-PPP improves the positioning accuracy by 53% and 31% over the DF-PPP in the horizontal and vertical directions, respectively. In contrast to the SF-PPP, the positioning accuracy and convergence time improvement can reach 62% and 90% in the horizontal direction, respectively. In the kinematic test, the MSDQ-PPP achieves an accuracy of 0⋅7 m and 1⋅5 m in the horizontal and vertical directions, respectively. The accuracy improvement rates reach 78% and 76% over the DF-PPP, and 13% and 38% over the SF-PPP, respectively. Both static and kinematic MSDQ-PPP tests indicate significantly enhanced positioning performance.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.