The Impact of Compass/Beidou-2 on Future GNSS: A Perspective From Asia

Yu-Sheng Huang, Meng-Lun Tsai

Abstract:	The next decade promises drastic improvements to global navigation satellite systems. The USA is modernizing GPS, Russia is refreshing GLONASS, Europe is moving ahead with its own Galileo system, and The People’s Republic of China is expanding its Beidou-1 system from a regional navigation system to a full constellation global navigation satellite system known as BeiDou-2/Compass, which consists thirty five satellite including geostationary satellites, MEO satellites as well as geosynchronous satellites in the coming year. Extra satellites will make possible improved performance for all applications, and especially where satellite signals can be obscured, such as in urban canyons, under tree canopies or in open-cut mines. The benefits of the expected extra satellites and their signals can be in terms of availability, accuracy, continuity, and reliability issues. The advent of hybrid GNSS constellation raises a lot of attention to study the compatibility and interoperability. A number of performance analyses have been conducted in a global scale with respect to availability, reliability, accuracy and integrity in different simulated scenarios (such as open sky and urban canyons) for each system individually as well as combined systems with all the possible combinations. Since the BeiDou-2/Compass has gained more attention from GNSS communities, the main objective of this study is to study the performance of BeiDou-2/Compass comparing to GPS, GLONASS and Galileo in the greater Asia region; and also to explore whether combining BeiDou-2/Compass with each GNSS would yield performance improvements in the same region. The performance analysis can be analyzed by either the signal or the geometrical conditions. However, the scope of this study is limited to investigate the impact of current and future GNSS based on the geometrical conditions. Therefore, the satellite visibility and DOP values of each system or possible combinations between them are used as the major indices for the performance evaluation with the emphasis on the addition of Compass. In addition, those indices are further analyzed in terms of their spatial and temporal distributions with the emphasis on the greater Asia region. Moreover, the spatial performance analyses are conducted in both global and regional scales to provide more insightful comparisons to illustrate the importance of future Compass for the users in the greater Asia region.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	2227 - 2238
Cite this article:	Huang, Yu-Sheng, Tsai, Meng-Lun, "The Impact of Compass/Beidou-2 on Future GNSS: A Perspective From Asia," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 2227-2238.
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