Using Multiple Reference Station GPS Networks for Aircraft Precision Approach and Airport Surface Navigation

2005 ◽  
Vol 4 (1&2) ◽  
pp. 2-11 ◽  
Author(s):  
Ahmed El-Mowafy
Keyword(s):  
Reference Station ◽  
Gps Networks ◽  
Multiple Reference

Analysis of GPS RTK performance using external NOAA tropospheric corrections integrated with a multiple reference station approach

GPS Solutions ◽  
2006 ◽  
Vol 10 (3) ◽  
pp. 171-186 ◽  
Author(s):  
Yong Won Ahn ◽  
G. Lachapelle ◽  
S. Skone ◽  
S. Gutman ◽  
S. Sahm
Keyword(s):  
Reference Station ◽  
Gps Rtk ◽  
Tropospheric Corrections ◽  
Multiple Reference

scholarly journals GPS/BDS RTK Positioning Based on Equivalence Principle Using Multiple Reference Stations

2020 ◽  
Vol 12 (19) ◽  
pp. 3178
Author(s):  
Jian Wang ◽  
Tianhe Xu ◽  
Wenfeng Nie ◽  
Guochang Xu
Keyword(s):  
Equivalence Principle ◽  
Urban Areas ◽  
Unmanned Vehicles ◽  
Global Navigation Satellite Systems ◽  
Reference Station ◽  
Unknown Parameters ◽  
Positioning Accuracy ◽  
Kinematic Positioning ◽  
Parameter Constraints ◽  
Multiple Reference

Reliable real-time kinematic (RTK) is crucially important for emerging global navigation satellite systems (GNSSs) applications, such as drones and unmanned vehicles. The performance of conventional single baseline RTK (SBRTK) with one reference station degrades greatly in dense, urban environments, due to signal blockage and multipath error. The increasing use of multiple reference stations for kinematic positioning can improve RTK positioning accuracy and availability in urban areas. This paper proposes a new algorithm for multi-baseline RTK (MBRTK) positioning based on the equivalence principle. The advantages of the solution are to keep observation independent and increase the redundancy to estimate the unknown parameters. The equivalent double-differenced (DD) observation equations for multiple reference stations are firstly developed through the equivalent transform. A modified Kalman filter with parameter constraints is proposed, as well as a partial ambiguity resolution (PAR) strategy is developed to determine an ambiguity subset. Finally, the static and kinematic experiments are carried out to validate the proposed algorithm. The results demonstrate that, compared with single global positioning system (GPS) and Beidou navigation system (BDS) RTK positioning, the GPS/BDS positioning for MBRTK can enhance the positioning accuracy with improvement by approximately (45%, 35%, and 27%) and (12%, 6%, and 19%) in the North (N), East (E), and Up (U) components, as well as the availability with improvement by about 33% and 10%, respectively. Moreover, the MBRTK model with two and three reference receivers can significantly increase the redundancy and provide smaller ambiguity dilution of precision (ADOP) values. Compared with the scheme-one and scheme-two for SBRTK, the MBRTK with multiple reference receivers have a positioning accuracy improvement by about (9%, 0%, and 6%) and (9%, 16%, and 16%) in N, E, and U components, as well as the availability improvement by approximately 10%. Therefore, compared with the conventional SBRTK, the MBRTK can enhance the strength of the kinematic positioning model as well as improve the positioning accuracy and availability.

scholarly journals Position Estimation Comparison of a 3-D Linear Lateration Algorithm with a Reference Selection Technique

2018 ◽  
Vol 10 (1) ◽  
pp. 207
Author(s):  
Abdulmalik Shehu Yaro ◽  
Ahmad Zuri Sha'ameri ◽  
Nidal Kamel
Keyword(s):  
Monte Carlo Simulation ◽  
Position Estimation ◽  
Least Square ◽  
Reference Station ◽  
Time Difference Of Arrival ◽  
Selection Technique ◽  
Reference Selection ◽  
Monte Carlo Simulation Result ◽  
Total Least Square ◽  
Multiple Reference

Multilateration system estimates emitter position using time difference of arrival (TDOA) measurement with a lateration algorithm. The position estimation (PE) accuracy of the system depends on several factors such as the number of ground receiving station (GRS)s deployed, the reference station used and the type of lateration algorithm. In this paper, the 3-D PE accuracy of a four-GRS linear lateration algorithm combined with a GRS reference pair selection (GREPS) technique is determined and compared with two different five-GRS linear lateration algorithms. The two five-GRS linear lateration algorithms chosen for comparison are based on single reference total least square (SF-TLS) and multiple reference least square (MF-LS) approaches. Monte Carlo simulation result comparison shows that the four-GRS linear lateration algorithm with the GREPS technique outperformed the SF-TLS and MF-LS with a reduction in horizontal coordinate PE error of about 50% and 30% respectively, and with a 90% reduction in the altitude error

Performance of Singapore Integrated Multiple Reference Station Network (SIMRSN) for RTK Positioning

GPS Solutions ◽  
2002 ◽  
Vol 6 (1-2) ◽  
pp. 65-71 ◽  
Author(s):  
Guorong Hu ◽  
Victor Khoo ◽  
Pong Goh ◽  
Choi Law
Keyword(s):  
Reference Station ◽  
Station Network ◽  
Multiple Reference

An approach for instantaneous ambiguity resolution for medium- to long-range multiple reference station networks

GPS Solutions ◽  
2004 ◽  
Vol 9 (1) ◽  
pp. 1-11 ◽  
Author(s):  
G. Hu ◽  
D. A. Abbey ◽  
N. Castleden ◽  
W. E. Featherstone ◽  
C. Earls ◽  
...  
Keyword(s):  
Long Range ◽  
Ambiguity Resolution ◽  
Reference Station ◽  
Multiple Reference

Comparative Analysis of Height-Related Multiple Correction Interpolation Methods with Constraints for Network RTK in Mountainous Areas

2016 ◽  
Vol 69 (5) ◽  
pp. 991-1010 ◽  
Author(s):  
Junesol Song ◽  
Byungwoon Park ◽  
Changdon Kee
Keyword(s):  
Comparative Analysis ◽  
Interpolation Method ◽  
Reference Station ◽  
Tropospheric Delay ◽  
Interpolation Methods ◽  
Network Rtk ◽  
The Usa ◽  
Vertical Positioning ◽  
Multiple Reference ◽  
Gps Observations

In Network RTK (Real-Time Kinematic) positioning, the multiple corrections from the reference stations, which constitute a network, are interpolated for the user location through appropriate interpolation models. There exist various methods to model spatial decorrelation errors from the tropospheric and ionospheric delay, which are the main contributors of the multiple corrections. Since tropospheric delay is largely affected by height differences, the heights of the multiple reference stations should be considered when selecting the appropriate interpolation methods. This work provides a comparative analysis of the different levels of performance of each height-related multiple correction interpolation method. In addition, this study proposes to add constraints to the conventional height-related interpolation methods that are derived from the characteristics of the tropospheric zenith delay variation over height. The actual Global Positioning System (GPS) observations are collected from selected reference station networks located in the USA for performance evaluation. As a result, the proposed solution yields improved vertical positioning accuracy by approximately 10% compared to the conventional interpolation methods for the selected networks.

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