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Article
Open AccessRandom forest-based multipath parameter estimation
Multipath is recognized as one of the major error sources for GNSS urban navigation. This study proposes a random forest (RF)-based multipath parameter estimator that uses random forest regression for paramete...
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Article
Open AccessGNSS direct position estimation-inspired positioning with pseudorange correlogram for urban navigation
Multipath (MP) reception has been among the main issues for accurate and reliable positioning in urban environments. It has been shown to introduce positioning errors of up to tens of meters for conventional t...
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Article
3D-map**-aided PPP-RTK aiming at deep urban canyons
As a hot topic in the GNSS community in recent years, PPP-RTK integrates the advantages of PPP and RTK, aiming to quickly realize centimeter-level single point positioning with ambiguity resolution. However, P...
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Article
Improving GNSS baseband using an RTK-position-aided code tracking algorithm
In an urbanized environment, a superior baseband algorithm fundamentally enhances global navigation satellite system (GNSS) receivers by resisting interferences such as reflection leading to multipath signals ...
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Article
Scalar and vector tracking loop simulation based on a uniform semi-analytic model and robustness analysis in multipath/NLOS situations
A semi-analytic model is proposed to efficiently analyze and compare the performance of both the scalar tracking loop (STL) and the vector tracking loop (VTL) in different operating situations. The quality of ...
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Article
Probabilistic approach to detect and correct GNSS NLOS signals using an augmented state vector in the extended Kalman filter
Non-line-of-sight (NLOS) global navigation satellite system (GNSS) signals are a major factor that limits the GNSS positioning accuracy in urban areas. An advanced GNSS signal processing technique, the vector ...
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Article
Open AccessMachine learning based LOS/NLOS classifier and robust estimator for GNSS shadow matching
Global Navigation Satellites Systems (GNSS) is frequently used for positioning services in various applications, e.g., pedestrian and vehicular navigation. However, it is well-known that GNSS positioning perfo...
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Article
Sky visibility estimation based on GNSS satellite visibility: an approach of GNSS-based context awareness
Global navigation satellite system (GNSS) positioning in urban areas does not currently provide accurate and stable performance because surrounding buildings can block and reflect satellite signals. However, i...
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Chapter and Conference Paper
Online Integrity Alert Limit Determination Method for Autonomous Vehicle Navigation
Integrity is the critical performance indicator for navigation in safety-critical applications such as autonomous vehicles. Alert limit is one of the representative parameter in integrity which defines the max...
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Article
Rectification of GNSS-based collaborative positioning using 3D building models in urban areas
GNSS collaborative positioning receives great attention because of the rapid development of vehicle-to-vehicle communication. Its current bottleneck is in urban areas. During the relative positioning using GNS...
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Article
A New Path Planning Algorithm Using a GNSS Localization Error Map for UAVs in an Urban Area
The mission of future parcel delivery will be performed by unmanned aerial vehicles (UAVs). However, the localization of global navigation satellite systems (GNSS) in urban areas experiences the notorious mult...
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Article
Open-source MATLAB code for GPS vector tracking on a software-defined receiver
The research regarding global positioning system (GPS) vector tracking (VT), based on a software-defined receiver (SDR), has been increasing in recent years. The strengths of VT include its immunity to signal ...
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Article
Analysis and modeling GPS NLOS effect in highly urbanized area
Current GPS positioning accuracy in urban areas is still unsatisfactory for various applications, including pedestrian navigation and autonomous driving. Due to the ineffectiveness of special corrector designs...
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Article
Optimization of 3D building models by GPS measurements
Recently, 3D building models have become an important aid to many positioning methods such as LiDAR and GPS positioning. Creating an accurate 3D building model requires accurate 2D building boundaries. We prop...
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Article
3D building model-based pedestrian positioning method using GPS/GLONASS/QZSS and its reliability calculation
The current low-cost global navigation satellite systems (GNSS) receiver cannot calculate satisfactory positioning results for pedestrian applications in urban areas with dense buildings due to multipath and ...
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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...
