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Open AccessFeature PaperArticle

Assessment of Dual Frequency GNSS Observations from a Xiaomi Mi 8 Android Smartphone and Positioning Performance Analysis

1
Department of Engineering, Parthenope University of Naples, 80133 Naples, Italy
2
Department of Civil, Constructional and Environmental Engineering, Sapienza University of Rome, I-00184 Rome, Italy
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(1), 91; https://doi.org/10.3390/electronics8010091
Received: 31 October 2018 / Revised: 8 January 2019 / Accepted: 9 January 2019 / Published: 15 January 2019
(This article belongs to the Special Issue Green Communications in Smart City)
On May 2018 the world’s first dual-frequency Global Navigation Satellite System (GNSS) smartphone produced by Xiaomi equipped with a Broadcom BCM47755 chip was launched. It is able to receive L1/E1/ and L5/E5 signals from GPS, Galileo, Beidou, and GLONASS (GLObal NAvigation Satellite System) satellites. The main aim of this work is to achieve the phone’s position by using multi-constellation, dual frequency pseudorange and carrier phase raw data collected from the smartphone. Furthermore, the availability of dual frequency raw data allows to assess the multipath performance of the device. The smartphone’s performance is compared with that of a geodetic receiver. The experiments were conducted in two different scenarios to test the smartphone under different multipath conditions. Smartphone measurements showed a lower C/N0 and higher multipath compared with those of the geodetic receiver. This produced negative effects on single-point positioning as showed by high root mean square error (RMS). The best positioning accuracy for single point was obtained with the E5 measurements with a DRMS (horizontal root mean square error) of 4.57 m. For E1/L1 frequency, the 2DRMS was 5.36 m. However, the Xiaomi Mi 8, thanks to the absence of the duty cycle, provided carrier phase measurements used for a static single frequency relative positioning with an achieved 2DRMS of 1.02 and 1.95 m in low and high multipath sites, respectively. View Full-Text
Keywords: Android smartphone GNSS raw observations; Galileo E5a; multipath assessment; static positioning; Xiaomi Mi 8; Matlab compact3 TEQC parser Android smartphone GNSS raw observations; Galileo E5a; multipath assessment; static positioning; Xiaomi Mi 8; Matlab compact3 TEQC parser
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MDPI and ACS Style

Robustelli, U.; Baiocchi, V.; Pugliano, G. Assessment of Dual Frequency GNSS Observations from a Xiaomi Mi 8 Android Smartphone and Positioning Performance Analysis. Electronics 2019, 8, 91.

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