Author: Ng, Hoi Fung
Title: 3D-mapping-aided GNSS real-time kinematics in urban environments
Degree: M.Sc.
Year: 2021
Department: Department of Mechanical Engineering
Pages: vi, 67 pages : color illustrations
Language: English
Abstract: Global navigation satellite system (GNSS) has become an essential technology for our daily life. Different location-based service (LBS) relies on GNSS to provide an all-time function reliable and precise positioning with wide area coverage. Real-Time Kinematic (RTK) GNSS is one of the most precise positioning technologies currently, which provide centimetre-level accuracy positioning for an application operating in an open-sky environment, such as a geodetic survey. However, GNSS signal can be blocked or reflected by the high-rise buildings in urban canyons, limiting the positioning performance in deep urban canyons. Blockage and reflection of the GNSS signal result in non-line-of-sight (NLOS) reception, multipath, and cycle slip effect. These errors introduce large localization error. Therefore, removing bad measurements become essential to enable RTK GNSS positioning in the urban environment. Using the 3D building model is the common and state-of-art method to identify the unhealthy satellite, namely 3D mapping aided (3DMA) GNSS. We believed that using the 3D building model can better exclude the NLOS satellite compared to a fixed high elevation angle mask. In this study, the concept of 3DMA GNSS will be adopted to RTK GNSS positioning, namely 3DMA GNSS RTK. This study proposes using a 3D building model with position hypothesis candidates to select healthy satellites for RTK positioning. Designed experiments are set up with actual raw GNSS measurement to examine the performance of 3DMA GNSS RTK. Geodetic- and commercial-grade receivers are employed to perform experiments in the urban environment of Hong Kong. Experiment results with geodetic-grade receiver datasets show that 3DMA GNSS RTK can provide a positioning accuracy with a 10cm averagely in the urban area.
Rights: All rights reserved
Access: restricted access

Files in This Item:
File Description SizeFormat 
5935.pdfFor All Users (off-campus access for PolyU Staff & Students only)3.29 MBAdobe PDFView/Open


Copyright Undertaking

As a bona fide Library user, I declare that:

  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.

By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

Show full item record

Please use this identifier to cite or link to this item: https://theses.lib.polyu.edu.hk/handle/200/11523