Performance Evaluation of QZSS Augmenting GPS and BDS Single-Frequency Single-Epoch Positioning with Actual Data in Asia-Pacific Region

Zhang, Qiuzhao; Yang, Wei; Zhang, Shubi; Yao, Lihui

doi:10.3390/ijgi7050186

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…The QZSS satellite was first launched in 2010 and operated along with GPS and allows the combined processing of both systems (Hauschild et al, 2012). Furthermore, the raised number of QZSS satellites, becoming four in 2018, resulted in increased availability, reliability, integrity, and accuracy of positioning covering the Asia-Pacific region (Zaminpardaz et al, 2018;Q. Zhang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Direct Georeferencing in Unmanned Aerial Vehicle Using Quasi-Zenith Satellite System

SYETIAWAN¹,

SUSILO²,

SUSILO³

et al. 2023

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To produce accurate topographic data, Unmanned Aerial Vehicle (UAV) still rely on Ground Control Points (GCPs) for georeferencing. However, using GCPs has several limitations, among others, related to the cost and time required for field measurements. In addition, not all areas are accessible for GCPs measurements due to poorly accessible terrain or security reasons. Direct georeferencing, a method to determine precise camera position and orientation in UAVs using Global Navigation Satellite System (GNSS) geodetic antenna. Post Processing Kinematic (PPK) or real-time coordinates can be applied to determine the camera position. One satellite that sends corrections to the rover on Earth is the Quasi-Zenith Satellite System (QZSS). This study aims to analyze the orthophoto accuracy of the results of direct georeferencing using precise coordinates from the QZSS satellites. The flight parameter was used at 60% sidelap and 80% overlap on an average flying altitude of 300 m above ground level resulting in 135 photos with a Ground Sampling Distance (GSD) value of 6 cm. The accuracy of direct georeferencing using QZSS horizontally and vertically was 1.134 m and 1.617 m, respectively. Meanwhile, the same metric results using conventional GCPs were 0.417 m horizontally and 0.419 m vertically. With these results, the horizontal accuracy of Direct Georeferencing using corrections from QZSS can be used for large-scale mapping of the 1: 5,000 class 1 scale, while vertical accuracy can be used for large-scale mapping of the 1: 5,000 class 3 scale. Direct georeferencing using QZSS corrections has the potential to support the acceleration of large-scale mapping activities in Indonesia.

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Section: Introductionmentioning

confidence: 99%

Direct Georeferencing in Unmanned Aerial Vehicle Using Quasi-Zenith Satellite System

SYETIAWAN¹,

SUSILO²,

SUSILO³

et al. 2023

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“…This is why multi-GNSS receivers are now widely used in car navigation systems, other mobile applications, smartphones and sports [3][4][5][6][7][8], as well as even including modern dual-frequency solutions [9][10][11][12]. Their very rapid development, associated with increasing the positioning accuracy, particularly in urbanised areas, results primarily from the rapidly increasing number of satellites of systems under construction [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Testing of Software for the Planning of a Linear Object GNSS Measurement Campaign under Simulated Conditions

et al. 2021

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The precision of a linear object measurement using satellite techniques is determined by the number and the relative position of the visible satellites by the receiver. The status of the visible constellation is described by the Dilution Of Precision (DOP). The obtained geometric coefficient values are dependent on many variables. When determining these values, field obstacles at the receiver location and satellite positions changing with time must be taken into account. Carrying out a series of surveys as part of a linear object Global Navigation Satellite System (GNSS) measurement campaign requires the optimisation problem to be solved. The manner of the inspection vehicle’s movement should be determined in such a way that the surveys are taken only within the pre-defined time frames and that the geometric coefficient values obtained at subsequent points of the route are as low as possible. The purpose of this article is to develop a software for the planning of a linear object GNSS measurement campaign to implemented in motion and taking into account the terrain model and its coverage. Additionally, it was determined how much the developed program improves DOP values on the planned route under simulated conditions. This software has no equivalent elsewhere in the world, as the current solutions for the planning of a GNSS measurement campaign, e.g., Trimble GNSS Planning, GNSS Mission Planning, or GPS Navigation Toolbox, allow the satellite constellation geometry to be analysed exclusively for specific coordinates and at a specific time. Analysis of the obtained simulation test results indicates that the campaign implementation in accordance with the pre-determined schedule significantly improves the quality of the recorded GNSS data. This is particularly noticeable when determining the position using the Global Positioning System (GPS) and GLObal NAvigation Satellite System (GLONASS) satellite constellations at the same time. During the tests conducted on the road along a three-kilometre-long route (tram loop) in Gdańsk Brzeźno, the average value of the obtained Position Dilution Of Precision (PDOP) decreased by 22.17% thanks to using the software to plan a linear object GNSS measurement campaign. The largest drop in the geometric coefficient values was noted for an area characterised by a very large number of field obstacles (trees with crowns and high buildings). Under these conditions, the PDOP value decreased by approx. 25%. In areas characterised by a small number of field obstacles (single trees in the vicinity of the track, clusters of trees and buildings located along the track), the changes in the PDOP were slightly smaller and amounted to several percent.

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“…The Quasi-Zenith Satellite System (QZSS) has been operated as a four-satellite constellation since November 2018, and three satellites can be available at all times to users in the Asia-Oceania region. Hence, both the QZSS and BDS systems can be used to improve the performance of GPS positioning in the above regions [11]. However, for European users, the Galileo Satellite Navigation System (Galileo) can only be used to improve the robustness and accuracy of GPS precise positioning.…”

Section: Introductionmentioning

confidence: 99%

Galileo Augmenting GPS Single-Frequency Single-Epoch Precise Positioning with Baseline Constrain for Bridge Dynamic Monitoring

et al. 2019

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The Single-frequency Single-epoch double-differenced baseline resolution technique of Global Positioning System (GPS) provides a good opportunity for monitoring the displacement or deflection behavior of bridges under different loading conditions in real-time. However, for single GPS, a high success rate baseline solution is difficult to achieve due to the lack of sufficient visible satellites and the low accuracy of float solutions. Galileo Satellite Navigation System (Galileo) has 14 medium earth orbit satellites (as of May 2018) that can be used to supplement GPS. The frequency bands of Galileo overlap with that of GPS on E1/L1 and E5a/L5, which is conducive to the combination of observations in integration positioning. Accordingly, Galileo augmenting GPS is an effective and necessary approach to improve the positioning availability and reliability. Moreover, using the baseline length constraint can improve the accuracy of float solutions, narrow the search space, and finally increase the success rate of ambiguity resolution and positioning. The single-frequency single-epoch double-differenced GPS/Galileo mathematical model with baseline length constraint is deduced in this paper. Two sets of GNSS real bridge data were used for further analysis on the improvement of GPS/Galileo with baseline length constraint when compared to single GPS. Finally, a Fast Fourier Transformation (FFT) algorithm was adopted for precisely detecting the local dominant frequencies of XB, YB, and ZB direction of the two stations.

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Performance Evaluation of QZSS Augmenting GPS and BDS Single-Frequency Single-Epoch Positioning with Actual Data in Asia-Pacific Region

Cited by 7 publications

References 22 publications

Direct Georeferencing in Unmanned Aerial Vehicle Using Quasi-Zenith Satellite System

Direct Georeferencing in Unmanned Aerial Vehicle Using Quasi-Zenith Satellite System

Testing of Software for the Planning of a Linear Object GNSS Measurement Campaign under Simulated Conditions

Galileo Augmenting GPS Single-Frequency Single-Epoch Precise Positioning with Baseline Constrain for Bridge Dynamic Monitoring

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