碩士 / 國立成功大學 / 民航研究所 / 102 / The development and implementation of Communication, Navigation, Surveillance, and Air Traffic Management (CNS/ATM) for civil aviation have attracted a lot of attention because CNS/ATM changes the current analog aviation system to the modern digital aviation system. As the enabling technology of the modern CNS/ATM system, the Global Positioning System (GPS), for example, is utilized for time synchronization between air data network, air communication network, and aircraft navigation for approach and landing. If a GPS experiences intentional or unintentional interference, there will be a significant impact on the normal operation of the CNS/ATM. Therefore, the United States 2010 Federal Radionavigation Plan and the Federal Aviation Administration (FAA) Next Generation Air Transportation System (NextGen) clearly indicates that an Alternative Position, Navigation and Timing (APNT) system should be developed to maintain CNS/ATM operations for periods during which GPS outages occur.
The objective of this thesis is thus to research and develop a Wide Area Multilateration (WAM) evaluation test bed which is one of the APNT concepts and to evaluate whether WAM has the ability to meet the backup navigation requirements for civil aviation users during severe GPS failure and outages. In this work, the signal of opportunity under consideration is the ADS-B radio link, and the Differential Time of Arrival (DTOA) method is used as the positioning algorithm. Thus, a software defined radio (SDR) approach is used to develop ADS-B SDR on the Universal Software Radio Peripheral (USRP). Also, WAM is based on the DTOA method, and it requires defining the ADS-B signal arrival time and consideration of a time synchronization scheme for all experimental equipment. Depending on the context, this work shows the ADS-B signal structure and development of the ADS-B SDR processing and also provides a detailed discussion of the configuration of the external hardware setup used to form a WAM evaluation test bed. Finally, in order to evaluate time synchronization capability and the WAM based on DTOA method, this work shows a WAM evaluation test bed using a USRP-based ADS-B receiver with real world data. In addition, the key factor for WAM is geometric distribution of ground stations. Thus, this work presents Horizontal Dilution of Precision (HDOP) to evaluate the effect of the geometric distribution of ADS-B ground stations for WAM positioning performance in the Taipei Flight Information Region (FIR).
| Identifer | oai:union.ndltd.org:TW/102NCKU5294003 |
| Date | January 2014 |
| Creators | Siang-LinJheng, 鄭向林 |
| Contributors | Shau-Shiun Jan, 詹劭勳 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 65 |
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