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Sensors 2016, 16(6), 910; doi:10.3390/s16060910

Position Accuracy Improvement by Implementing the DGNSS-CP Algorithm in Smartphones

1
School of Aerospace Engineering, Sejong University, Seoul 05006, Korea
2
Institute of Advanced Aerospace Technology, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Korea
3
School of Integrated Technology and Yonsei Institute of Convergence Technology, Yonsei University, Incheon 21983, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Lyudmila Mihaylova, Byung-Gyu Kim and Debi Prosad Dogra
Received: 24 March 2016 / Revised: 7 June 2016 / Accepted: 14 June 2016 / Published: 18 June 2016
(This article belongs to the Special Issue Scalable Localization in Wireless Sensor Networks)
View Full-Text   |   Download PDF [12241 KB, uploaded 18 June 2016]   |  

Abstract

The position accuracy of Global Navigation Satellite System (GNSS) modules is one of the most significant factors in determining the feasibility of new location-based services for smartphones. Considering the structure of current smartphones, it is impossible to apply the ordinary range-domain Differential GNSS (DGNSS) method. Therefore, this paper describes and applies a DGNSS-correction projection method to a commercial smartphone. First, the local line-of-sight unit vector is calculated using the elevation and azimuth angle provided in the position-related output of Android’s LocationManager, and this is transformed to Earth-centered, Earth-fixed coordinates for use. To achieve position-domain correction for satellite systems other than GPS, such as GLONASS and BeiDou, the relevant line-of-sight unit vectors are used to construct an observation matrix suitable for multiple constellations. The results of static and dynamic tests show that the standalone GNSS accuracy is improved by about 30%–60%, thereby reducing the existing error of 3–4 m to just 1 m. The proposed algorithm enables the position error to be directly corrected via software, without the need to alter the hardware and infrastructure of the smartphone. This method of implementation and the subsequent improvement in performance are expected to be highly effective to portability and cost saving. View Full-Text
Keywords: smartphone; android; location-based system; global navigation satellite system; differential GNSS smartphone; android; location-based system; global navigation satellite system; differential GNSS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yoon, D.; Kee, C.; Seo, J.; Park, B. Position Accuracy Improvement by Implementing the DGNSS-CP Algorithm in Smartphones. Sensors 2016, 16, 910.

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