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Article
Evaluation of different constrained LAMBDAs for low-cost GNSS attitude determination in an urban environment
Complex urban environments limit the reception of global navigation satellite system (GNSS) signals, increasing the difficulty of ambiguity resolution (AR) for GNSS attitude determination based on carrier-phas...
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Article
Prediction of Real-Time Kinematic Positioning Availability on Road Using 3D Map and Machine Learning
Real-Time Kinematic (RTK) positioning is a precise positioning method, which is expected to support self-driving. However, it is known that the availability of RTK highly depends on the Global Navigation Satel...
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Article
Application of optimal stop** theory in batch partial ambiguity resolution
As the number of satellites increases, the risk of fixing wrong integer ambiguities may reduce the accuracy and efficiency of ambiguity resolution (AR); Thus, partial ambiguity resolution (PAR) is proposed for...
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Article
Mixed QZSS/GPS/Galileo RTK positioning with a trade-off between ionosphere-weighting and ionosphere-fixed models: an ambiguity resolution method for Japan
In real-time kinematic (RTK) positioning, the ambiguity resolution (AR) performance is critically affected by ionospheric delays. The ionospheric delays can be represented by a function of vertical total elect...
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Article
Calibration and analysis of BDS receiver-dependent code biases
Different designs of receiver correlators and front ends will cause different biases in terms of the pseudorange. In this paper, we present an algorithm to derive GNSS receiver-dependent code biases by estimat...
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Article
Apparent clock and TGD biases between BDS-2 and BDS-3
With the official commencement of the BDS-3 service, the BeiDou navigation satellite system (BDS) has become a global navigation satellite system. The characteristics of the new BDS-3 satellites, including cod...
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Chapter and Conference Paper
An Improved Method for BDS Inter-frequency Clock Bias Estimation
Inter-frequency clock bias (IFCB) should be considered when performing triple-frequency GNSS precise point positioning (PPP). Traditional approach of IFCB estimation is by averaging IFCB of all stations. Howev...
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Chapter and Conference Paper
Assessment of the Contribution of QZSS Combined GPS/BeiDou Positioning in Asia-Pacific Areas
Three QZSS satellites are launched in 2017, which implies that a four satellites regional system is to be established in 2018. There is no doubt that QZSS will play a more important role in the future global G...
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Article
Mixed GPS–BeiDou RTK with inter-systems bias estimation aided by CSAC
It is now common to use multiple GNSS constellations (multi-GNSS) for precise positioning. When GPS and BeiDou satellites are used in real-time kinematic GNSS (RTK-GNSS), the normal approach is to construct s...
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Article
Maintaining real-time precise point positioning during outages of orbit and clock corrections
The precise point positioning (PPP) is a popular positioning technique that is dependent on the use of precise orbits and clock corrections. One serious problem for real-time PPP applications such as natural h...
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Article
Cooperative Relative Positioning for Intelligent Transportation System
Global navigation satellite system-based positioning plays an important role in support system for safe driving, where relative positions of vehicles are used to prevent collision accidents from happening. In ...
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Article
Multipath mitigation and NLOS detection using vector tracking in urban environments
Multipath interference and non-line-of-sight (NLOS) reception are major error sources when using global navigation satellite systems in urban environments. A promising approach to minimize the effect of multi...
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Article
Open AccessAdvantage of velocity measurements on instantaneous RTK positioning
Instantaneous real-time kinematic (RTK) techniques are one approach to achieving real-time high-accuracy positioning. The object of this paper is to show the advantage of adding velocity information to instant...
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Article
Performance analysis of GPS augmentation using Japanese Quasi-Zenith Satellite System
The current GPS satellite constellation provides limited availability and reliability for a country like Japan where mountainous terrain and urban canyons do not allow a clear skyline to the horizon. At presen...
