Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Mechanical Engineering | en_US |
| dc.contributor.advisor | Jiang, Yiping (AAE) | en_US |
| dc.creator | Shao, Jingheng | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/12995 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Using dual-frequency SBAS in BDS-3 for UDRE optimization | en_US |
| dcterms.abstract | Global Navigation Satellite Systems (GNSS) have found widespread applications in various fields, especially in the commercial aviation for its low-cost and continuous navigation. However, the precision of Global Navigation Satellite Systems (GNSS) can be significantly impacted by atmospheric delays and satellite errors. To improve the reliability and accessibility of GNSS, various augmentation systems have been developed, including the satellite-based augmentation system (SBAS). One of the key function for SBAS is to provide users with satellite ephemeris-clock (SEC) corrections, and generate corresponding confidence bound (UDRE/DFRE) to users, which serve as a means to evaluate the quality of the computed corrections. | en_US |
| dcterms.abstract | The initial phase of this research endeavor focuses on elucidating the basic theory of two SEC algorithms, namely WAAS and BDWAAS. A comprehensive comparison between these algorithms is conducted, examining their respective characteristics and performance. Furthermore, a static user location determination experiment was conducted to investigate the efficacy of the generated Satellite Ephemeris-Clock (SEC) corrections in the context of GPS-only positioning and GPS-BDS joint constellation positioning. The experimental findings reveal a substantial enhancement in positioning accuracy through the utilization of both WAAS and BDWAAS algorithms. Moreover, the SEC corrections generated based on WAAS and BDWAAS exhibit similar performance characteristics within a narrowly-distributed SBAS model, such as the HK region. The positioning enhancement is substantial, transitioning from meter-level to sub-meter level precision, with a particular emphasis on the GPS-BDS constellation. | en_US |
| dcterms.abstract | The second major contribution of this study is the development of a chi-square code carrier coherence (CCC) monitor aimed at detecting potential code carrier divergence (CCD), which would degrade the performance of computed satellite corrections. In this part of the study, we begin by analyzing the impact of CCD on the generation of satellite corrections. Additionally, we compare the characteristics of different CCC monitors and subsequently design an optimal chi-square monitor using an overbound technique. The results of the Probability of Missed Detection (PMD) analysis demonstrate that the proposed chi-square CCC monitor is capable of detecting smaller divergences while meeting the same integrity requirement across all 11 simulated divergence fault modes. | en_US |
| dcterms.extent | x, 89 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2023 | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.LCSH | Artificial satellites in navigation | en_US |
| dcterms.LCSH | Global Positioning System | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 7475.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 49.16 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- 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.
- 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.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/12995