Simple Loran Cycle Error Detection Algorithms for Maritime Harbor Entrance Approach Operations

Benjamin B. Peterson, Sherman Lo, Per K. Enge

Abstract:	Enhanced Loran (eLoran) is designed to support maritime harbor entrance approach (HEA) operations. As a result, the Radio Technical Commission for Maritime Services (RTCM) special committee 127 (SC127) is developing minimum performance specifications (MPS) for HEA eLoran receiver. The MPS specify required algorithms and processes to ensure safe operations of the receiver. One important algorithm is the high integrity determination of the tracked Loran cycle. This paper details and examines some of the algorithms being developed and analyzed by SC127. SC 127 is developing simplified eLoran cycle error detection algorithms for the eLoran HEA MPS. Correct Loran cycle selection is needed to ensure safety as a cycle selection error results in range errors of 3 km or more. As HEA operations require accuracy levels of 10 meters, such errors pose a significant hazard. While other high integrity Loran cycle error detection algorithms have been proposed, these are require complex calculations and significant processing. The use of differential Loran in HEA supported areas can be leveraged to create a significantly simpler algorithm allowing for easier and lower cost implementation. This paper develops and examines two simplified algorithms for cycle error detection for HEA. These algorithms use receiver autonomous integrity monitoring (RAIM) basic techniques of residual error and solution separation. The paper describes the algorithms, their implementation and demonstrates its capabilities in the conterminous United States (CONUS). The goal of the work is to provide and demonstrate feasible algorithms for manufacturers to use for their MPS compliant HEA receiver.
Published in:	Proceedings of the 2010 International Technical Meeting of The Institute of Navigation January 25 - 27, 2010 Catamaran Resort Hotel San Diego, CA
Pages:	472 - 479
Cite this article:	Peterson, Benjamin B., Lo, Sherman, Enge, Per K., "Simple Loran Cycle Error Detection Algorithms for Maritime Harbor Entrance Approach Operations," Proceedings of the 2010 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2010, pp. 472-479.
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