Assessment of the LandStar Real-Time DGPS Service under Several Operational Conditions
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- 作者：G. Fotopoulos ; M. E. Cannon ; A. Bogle and G. Johnston
- 刊名：GPS Solutions
- 出版年：1999
- 出版时间：April 1999
- 年：1999
- 卷：2
- 期：4
- 页码：22-34
- 全文大小：5,560 KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Geophysics and Geodesy
Meteorology and Climatology
Extraterrestrial Physics and Space Sciences
Automotive and Aerospace Engineering and Traffic
Electronic and Computer Engineering - 出版者：Springer Berlin / Heidelberg
- ISSN：1521-1886
文摘
LandStar is a differential global positioning service (DGPS) that provides 24-h real-time positioning for various applications on land, water, and air in North America, Australia, New Zealand, Europe, and Africa. Its focus is on real-time applications requiring a submeter positioning capability such as agriculture, forestry, Geospatial Information Systems (GIS), survey/mapping, and land/vehicular navigation. LandStar uses a Wide Area Network of reference stations to derive DGPS corrections to model the variation of GPS error sources over a large area. These model parameters are used by the Virtual Reference Station processors to calculate standard corrections that are available for all predefined locations in the network. The corrections are transmitted to the user by L-band satellite communication in the standard RTCM SC104 DGPS correction format. This article investigates the performance of the LandStar Mk III system under various operational conditions and assesses its performance in both static and kinematic modes. Four field tests were conducted during 12 months that tested the sysem in clear static and kinematic conditions as well as suboptimal environments associated with low and heavy foliage conditions. Both the accuracy and availability of the system under these conditions is investigated, with an emphasis on whether the above variables are caused by the LandStar system differential corrections, the GPS measurements, or a combination of both. ? 1999 John Wiley & Sons, Inc.