High Accuracy Differential Positioning with Smartphone GNSS Raw Measurements

WANG Yingzhe; TAO Xianlu; ZHU Feng; LIU Wanke; ZHANG Xiaohong; WU Mingkui

doi:10.13203/j.whugis20210280

Volume 46 Issue 12

Dec. 2021

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Geomatics and Information Science of Wuhan University > 2021 > 46(12): 1941-1950. > DOI: 10.13203/j.whugis20210280

WANG Yingzhe, TAO Xianlu, ZHU Feng, LIU Wanke, ZHANG Xiaohong, WU Mingkui. High Accuracy Differential Positioning with Smartphone GNSS Raw Measurements[J]. Geomatics and Information Science of Wuhan University, 2021, 46(12): 1941-1950. DOI: 10.13203/j.whugis20210280

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High Accuracy Differential Positioning with Smartphone GNSS Raw Measurements

1.
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2.
Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China
3.
School of Geography and Information Engineering, China University of Geosciences(Wuhan), Wuhan 430074, China

Funds:

The National Key Research and Development Program of China 2016YFB0501803

Major Special Projects of Technological Innovation in Hubei Province 2019AAA043

the Major Project of China's Second-Generation Navigation Satellite System GFZX030302030202

the Wuhan Science and Technology Project 2020010601012185

Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University 19-01-06

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Author Bio:
WANG Yingzhe, postgraduate, majors in low-cost high precise GNSS navigation. E-mail: yzwang2019@whu.edu.cn
Corresponding author:
ZHU Feng, PhD, associate researcher. E-mail: fzhu@whu.edu.cn
Received Date: May 31, 2021
Published Date: December 04, 2021

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Abstract

Abstract

Objectives The demand for smartphones to provide stable high accuracy navigation and positioning service is increasing. However, limited by low-cost and low-power hardware of smartphones, there are high pseudo-range noise, serious multipath effects and frequent cycle slips, which lead to poor positioning performance.
Methods The paper supposes a velocity-constraint dual-frequency RTD(real time differential)/RTK(real time kinematic) automatic switching navigation model. Firstly, L5/E5a/B2 signals are more resistant to multipath effects and help to improve the positioning performance. Secondly, the multipath noise is smoothed effectively by using velocity-constraint filtering model. Finally, RTD/RTK automatic switching strategy improves the stability and accuracy of positioning, especially under urban environment where continuous carrier phase measurements are insufficient.
Results and Conclusions This paper assesses the positioning performance of the Huawei Mate40 and the results show that the fixed rates of static positioning and pedestrian positioning are 99.67% and 57.99% respectively. Horizontal positioning accuracy of the pedestrian test is about 0.5 m. The vehicle positioning results show that more than 70% epochs can reach lane-level accuracy, which shows that the method supposed in this paper can basically meet the smartphone users' needs of high accuracy navigation and positioning service under urban environment.
- smartphone,
- GNSS raw measurements,
- differential positioning,
- ambiguity resolution,
- urban environment

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