Abstract
The release of the world’s first dual-frequency GPS/Galileo smartphone, Xiaomi mi 8, in 2018 provides an opportunity for high-precision positioning using ultra low-cost sensors. In this research, the GNSS precise point positioning (PPP) accuracy of the Xiaomi mi 8 smartphone is tested in post-processing and real-time modes. Raw dual-frequency observations are collected over two different time windows from both of the Xiaomi mi 8 smartphone and a Trimble R9 geodetic-quality GNSS receiver using a short baseline, due to the lack of a nearby reference station to the observation site. The data sets are first processed in differential modes using Trimble business center (TBC) software in order to provide the reference positioning solution for both of the geodetic receiver and the smartphone. An in-house PPP software is then used to process the collected data in both of post-processing and real-time modes. Precise ephemeris obtained from the multi-GNSS experiment (MGEX) is used for post-processing PPP, while the new NAVCAST real-time GNSS service, Germany, is used for real-time PPP. Additionally, the real-time PPP solution is assessed in both of static and kinematic modes. It is shown that the dual-frequency GNSS smartphone is capable of achieving decimeter-level positioning accuracy, in both of post-processing and real-time PPP modes, respectively. Meter-level positioning accuracy is achieved in the kinematic mode.
Highlights
Precise point positioning (PPP) is a popular global navigation satellite system (GNSS) positioning technique, due to its ability to provide centimeter to decimeter positioning accuracy using a standaloneGNSS receiver [1]
Precise ephemeris obtained from the multi-GNSS experiment (MGEX) is used for post-processing PPP, while the new NAVCAST real-time GNSS service, Germany, is used for real-time PPP
It is shown that the dual-frequency GNSS smartphone is capable of achieving decimeter-level positioning accuracy, in both of post-processing and real-time PPP modes, respectively
Summary
Precise point positioning (PPP) is a popular global navigation satellite system (GNSS) positioning technique, due to its ability to provide centimeter to decimeter positioning accuracy using a standalone. The main challenge in applying rapid-static and NRTK techniques is the need for either a base station in the vicinity of the surveying area, which is relatively expensive, or a VRS, which is not available in remote regions To overcome this limitation, the smartphone’s SF GNSS pseudorange and carrier-phase measurements were processed in PPP mode [6,7]. The availability of pseudorange and carrier phase measurements on L1/E1 and L5/E5 frequencies allows the user to linearly combine the observations to essentially remove the effect of ionospheric delay This in turn leads to an enhanced PPP positioning solution. It is shown that the dual-frequency GPS/Galileo smartphone is capable of achieving decimeter positioning accuracy in both of the post-processing PPP and real-time PPP modes for the static case, respectively.
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