Design of a doppler-aided GPS navigation system for weak signals caused by strong ionospheric scintillation
Abstract/Contents
- Abstract
- The fundamental tasks of a Global Positioning System (GPS) receiver are signal tracking and noise rejection. The essence of this dissertation is investigating the balance between the aforementioned objectives; taking advantage of the noise immunity property of external sensors, and designing novel integrated tracking architectures to advance the performance of a GPS receiver under strong interference conditions. Specifically, the problem of interest is resolving the interference due to ionospheric scintillation on the GPS receiver used in aviation navigation. Using GPS for landing aircraft in equatorial regions is more difficult than in other regions because ionospheric scintillation is prevalent. Ionospheric scintillation causes amplitude fades of 20 dB or more, and an increase in the phase jitter. This research evaluates techniques to enhance a GPS receiver's ability to overcome ionospheric scintillation. To validate the designed GPS receiver, a GPS channel model for aircraft landing in equatorial regions is built based on the use of a high fidelity GPS constellation simulator, a clock emulator, and real GPS data from the equator that contains an abundance of ionospheric scintillation. The results of this research demonstrate that the integration of a GPS receiver with a low-cost inertial navigation system provides the capability to operate continuously during periods of strong scintillation. In addition, so-called vector processing also shows promise for a less severe scintillation environment. Various combinations of receiver tracking architectures and aiding methods have been analyzed to quantify the sensitivity improvement of an "aided" GPS receiver.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2010 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Chiou, Tsung-Yu |
|---|---|
| Associated with | Stanford University, Department of Aeronautics and Astronautics |
| Primary advisor | Enge, Per |
| Thesis advisor | Enge, Per |
| Thesis advisor | Powell, J. David, 1938- |
| Thesis advisor | Walter, Todd |
| Advisor | Powell, J. David, 1938- |
| Advisor | Walter, Todd |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Tsung-Yu Chiou. |
|---|---|
| Note | Submitted to the Department of Aeronautics and Astronautics. |
| Thesis | Thesis (Ph. D.)--Stanford University, 2010. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2010 by Tsung-Yu Chiou
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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