Field Measurements of dLoran for Harbor Entrance and Approach

Wouter J. Pelgrum, Arthur W.S. Helwig, Gerard W.A. Offermans, and Erik Johannessen

Abstract:	A major thrust of the FAA and USCG Loran Evaluation Program is to determine whether an enhanced Loran system can provide the Accuracy, Availability, Integrity, and Continuity to support Harbor Entrance and Approach (HEA) for maritime. The success of differential Loran depends on the amount of temporal and spatial decorrelation of the differential corrections. In June through December of 2003, data collection was performed in Boston Harbor and environs. The measurements in Boston are intended to give an assessment of the following issues: - Minimal spatial grid differential corrections - ASF mapping requirements - Amount of differential data The on-going measurement campaign is performed in support of the development of a prototype integrated GPS/WAAS/dLoran receiver capable of meeting Harbor Entrance and Approach (HEA) level accuracies (i.e. < 20m, 95%.) In addition to GPS/WAAS, the described receiver will provide highly accurate navigation information via Loran only. This paper describes: test objectives, test set-up, method of data reduction, results of data reduction, problems encountered, discussion of measured temporal and spatial variations, data rate implications, monitors required, survey needs, and recommendations for subsequent measurement efforts. Implications to the design of a commercial product-based receiver are summarized.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	714 - 720
Cite this article:	Pelgrum, Wouter J., Helwig, Arthur W.S., Offermans, Gerard W.A., Johannessen, Erik, "Field Measurements of dLoran for Harbor Entrance and Approach," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 714-720.
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