Testing LandStar's Performance Under Operational Conditions

G. Fotopoulos, M.E. Cannon, A. Bogle, G. Johnston

Abstract:	LandStar is a differential GPS service which provides 24 hour 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 sub-meter positioning capability such as agriculture, forestry, GIS, survey/mapping, and land/vehicular navigation. LandStar uses a Wide Area Network of reference stations to derive DGPS corrections in order to model the variation of GPS error sources over a large area. These model parameters are used by the Virtual Reference Station (VRS) processors to calculate standard corrections which are available for all pre-defined locations in the network. The corrections are transmitted to the user by L-band satellite communication in the standard RTCM SC 104 DGPS correction format. This paper investigates the performance of the LandStar Mk III system under various operationai conditions and assesses its performance in both static and kinematic modes. Several field tests are conducted to determine the availability of the system under heavy foliage conditions and various types of foliage with seasonal effects taken into consideration. An important factor which is monitored is whether the above variables are due to the LandStar system differential corrections, the GPS measurements or a combination of both.
Published in:	Proceedings of the 1998 National Technical Meeting of The Institute of Navigation January 21 - 23, 1998 Westin Long Beach Hotel Long Beach, CA
Pages:	207 - 215
Cite this article:	Fotopoulos, G., Cannon, M.E., Bogle, A., Johnston, G., "Testing LandStar's Performance Under Operational Conditions," Proceedings of the 1998 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 1998, pp. 207-215.
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