Related Experiment Video
Updated: Aug 16, 2025
07:51
Video Movement Analysis Using Smartphones ViMAS: A Pilot Study
Published on: March 14, 2017
16.9K
Inherent Limitations of Smartphone GNSS Positioning and Effective Methods to Increase the Accuracy Utilizing
Jeonghyeon Yun1, Cheolsoon Lim1, Byungwoon Park1
1Department of Aerospace Engineering and Convergence Engineering for Intelligent Drone, Sejong University, Seoul 05006, Republic of Korea.
Sensors (Basel, Switzerland)
|December 23, 2022
Summary
This study enhances Android smartphone Global Navigation Satellite System (GNSS) positioning accuracy using dual-frequency L5 measurements and proposed correction methods. Results show improved accuracy comparable to low-cost receivers.
Area of Science:
- Geomatics Engineering
- Satellite Navigation Systems
- Mobile Device Technology
Background:
- Android smartphones with multi-constellation and dual-frequency Global Navigation Satellite System (GNSS) capabilities were expected to offer precise positioning.
- However, inherent limitations in smartphone GNSS raw measurement quality, including antenna quality and cycle slips, hinder high-accuracy applications like real-time kinematic (RTK) and precise point positioning (PPP).
Purpose of the Study:
- To address the limitations of smartphone GNSS receivers and propose practical strategies for achieving robust precise positioning.
- To evaluate the effectiveness of L5 measurements, pseudo-range corrections, and Doppler-based filtering for improving positioning accuracy in Android devices.
Main Methods:
- Utilizing dual-frequency (L1/E1 and L5/E5) GNSS measurements from a Xiaomi Mi8 smartphone.
- Implementing a practical strategy involving L5 measurements, pseudo-range corrections for L5, and a weighting method.
- Applying L5 differential GNSS (DGNSS) and Doppler-based filtering techniques.
Main Results:
- The proposed methods significantly improved the positioning accuracy of the Android device.
- Achieved a horizontal accuracy of 1.75 meters and a vertical accuracy of 4.56 meters.
- The performance is comparable to that of commercial low-cost GNSS receivers.
Conclusions:
- The proposed practical strategy, incorporating L5 measurements and advanced filtering, effectively overcomes inherent limitations in Android smartphone GNSS.
- Dual-frequency GNSS in smartphones, when augmented with appropriate techniques, can achieve reliable positioning accuracy suitable for various applications.
- This research paves the way for more accurate and accessible location-based services using everyday mobile devices.
Related Concept Videos
01:26Errors in Global Positioning System
89
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
89
01:28Field Application of Global Positioning System
85
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
85
01:30Types of Global Positioning System Surveys
105
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
105
01:30Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device
155
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
155
01:30Introduction to Global Positioning System
122
The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
122
01:17Common Leveling Mistakes and Errors
109
A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
109