Hoi-Fung (Ivan) NG

Hoi-Fung (Ivan) NG

PhD student

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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.

Pages

Posts

Future Blog Post

less than 1 minute read

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Blog Post number 4

less than 1 minute read

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This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

Blog Post number 3

less than 1 minute read

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Blog Post number 2

less than 1 minute read

Published:

This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

Blog Post number 1

less than 1 minute read

Published:

This is a sample blog post. Lorem ipsum I can’t remember the rest of lorem ipsum and don’t have an internet connection right now. Testing testing testing this blog post. Blog posts are cool.

portfolio

publications

3D Mapping Database Aided GNSS Based Collaborative Positioning Using Factor Graph Optimization

Published in IEEE Transactions on Intelligent Transportation Systems, 2020

This study proposed a novel 3D mapping aided (3DMA) GNSS-based collaborative positioning method that makes use of the available surrounding GNSS receivers’ measurements.

Recommended citation: Zhang, G., Ng, H.-F., Wen, W., & Hsu, L.-T. (2021). 3D Mapping Database Aided GNSS Based Collaborative Positioning Using Factor Graph Optimization. IEEE Transactions on Intelligent Transportation Systems, 22(10), 6175-6187. https://doi.org/10.1109/TITS.2020.2988531. https://ieeexplore.ieee.org/document/9082815

Improved weighting scheme using consumer-level GNSS L5/E5a/B2a pseudorange measurements in the urban area

Published in Advances in Space Research, 2020

This study developed a GNSS L1/L5 bands integrated positioning algorithm to improve the positioning performance in urban areas

Recommended citation: Ng, H.-F., Zhang, G., Yang, K.-Y., Yang, S.-X., & Hsu, L.-T. (2020). Improved weighting scheme using consumer-level GNSS L5/E5a/B2a pseudorange measurements in the urban area. Advances in Space Research, 66(7), 1647-1658. https://doi.org/10.1016/j.asr.2020.06.002. https://www.sciencedirect.com/science/article/abs/pii/S027311772030404X?via%3Dihub

Skymask Matching Aided Positioning Using Sky-Pointing Fisheye Camera and 3D City Models in Urban Canyons

Published in Sensors, 2020

A new skymask matching algorithm is then proposed to match the segmented fisheye images with skymasks generated from a 3D building model.

Recommended citation: Lee, M. J., Lee, S., Ng, H.-F., & Hsu, L.-T. (2020). Skymask Matching Aided Positioning Using Sky-Pointing Fisheye Camera and 3D City Models in Urban Canyons. Sensors, 20(17). https://doi.org/10.3390/s20174728. https://www.mdpi.com/1424-8220/20/17/4728

A Computation Effective Range-Based 3D Mapping Aided GNSS with NLOS Correction Method

Published in Journal of Navigation, 2021

A GNSS realistic urban measurement simulator is developed to provide measurements for collaborative positioning studies

Recommended citation: Ng, H.-F., Zhang, G., & Hsu, L.-T. (2020). A Computation Effective Range-based 3D Mapping Aided GNSS with NLOS Correction Method. Journal of Navigation, 73(6), 1202-1222. https://doi.org/10.1017/S037346332000003x. https://www.cambridge.org/core/journals/journal-of-navigation/article/abs/computation-effective-rangebased-3d-mapping-aided-gnss-with-nlos-correction-method/8C84E4AA4FF7DC640BAA7369C7ECFC90

GNSS RUMS: GNSS Realistic Urban Multiagent Simulator for Collaborative Positioning Research

Published in Remote Sensing, 2021

A GNSS realistic urban measurement simulator is developed to provide measurements for collaborative positioning studies

Recommended citation: Zhang, G., Xu, B., Ng, H.-F., & Hsu, L.-T. (2021). GNSS RUMS: GNSS Realistic Urban Multiagent Simulator for Collaborative Positioning Research. Remote Sensing, 13(4). https://doi.org/10.3390/rs13040544. https://www.mdpi.com/2072-4292/13/4/544

3D Mapping Database-Aided GNSS RTK and Its Assessments in Urban Canyons

Published in IEEE Transactions on Aerospace and Electronic Systems, 2021

This article compares the position results between 3D mapping-aided GNSS RTK and the GNSS RTK with a fixed elevation angle mask.

Recommended citation: Ng, H.-F., & Hsu, L.-T. (2021). 3D Mapping Database-Aided GNSS RTK and Its Assessments in Urban Canyons. IEEE Transactions on Aerospace and Electronic Systems, 57(5), 3150-3166. https://doi.org/10.1109/TAES.2021.3069271. https://ieeexplore.ieee.org/document/9388876

Robust GNSS Shadow Matching for Smartphones in Urban Canyons

Published in IEEE Sensors Journal, 2021

This paper introduces a machine learning intelligent classifier with features to distinguish LOS and NLOS. With the NLOS reception classification, the positioning accuracy of shadow matching can be increased

Recommended citation: Ng, H.-F., Zhang, G., & Hsu, L.-T. (2021). Robust GNSS Shadow Matching for Smartphones in Urban Canyons. IEEE Sensors Journal, 21(16), 18307-18317. https://doi.org/10.1109/JSEN.2021.3083801. https://ieeexplore.ieee.org/document/9440901

Urban positioning: 3D mapping-aided GNSS using dual-frequency pseudorange measurements from smartphones

Published in NAVIGATION, 2021

This study integrated the multi-constellation L5-band measurements into 3DMA GNSS to improve the positioning performance in urban canyons, namely the L1-L5 3DMA GNSS.

Recommended citation: Ng, H.-F., Zhang, G., Luo, Y., & Hsu, L.-T. (2021). Urban positioning: 3D mapping-aided GNSS using dual-frequency pseudorange measurements from smartphones. NAVIGATION, Journal of the Institute of Navigation, 68(4), 727-749. https://doi.org/10.1002/navi.448. https://onlinelibrary.wiley.com/doi/full/10.1002/navi.448

Real-Time Loosely Coupled 3DMA GNSS/Doppler Measurements Integration Using a Graph Optimization and Its Performance Assessments in Urban Canyons of New York

Published in Sensors, 2022

This study developed a real-time 3DMA GNSS-positioning system based on state-of-the-art 3DMA GNSS algorithms and optimized with Doppler measurements using factor graph optimization (FGO) in a loosely-coupled fashion

Recommended citation: Ng, H.-F., Hsu, L.-T., Lee, M. J. L., Feng, J., Naeimi, T., Beheshti, M., & Rizzo, J.-R. (2022). Real-Time Loosely Coupled 3DMA GNSS/Doppler Measurements Integration Using a Graph Optimization and Its Performance Assessments in Urban Canyons of New York. Sensors, 22(17), 6533. https://doi.org/10.3390/s22176533. https://www.mdpi.com/1424-8220/22/17/6533

3D-mapping-aided PPP-RTK aiming at deep urban canyons

Published in Journal of Geodesy, 2022

This study proposes a 3D-mapping-aided weighting algorithm to enhance the performance of PPP-RTK in complex urban environments

Recommended citation: Xin, S., Geng, J., Zhang, G., Ng, H.-F., Guo, J., & Hsu, L.-T. (2022). 3D-mapping-aided PPP-RTK aiming at deep urban canyons. Journal of Geodesy, 96(10), 78. https://doi.org/10.1007/s00190-022-01666-1. https://link.springer.com/article/10.1007/s00190-022-01666-1

talks

teaching

Teaching experience 1

Undergraduate course, University 1, Department, 2014

This is a description of a teaching experience. You can use markdown like any other post.

Teaching experience 2

Workshop, University 1, Department, 2015

This is a description of a teaching experience. You can use markdown like any other post.