The LORAN-C network is being recapitalized to serve as a backup to GPS for navigation and timing. LORAN-C is being investigated as a precision (sub 100 ns) time recovery system for use in the continental United States. Traditionally, LORAN-C time recovery has been limited by propagation effects (both spatial and temporal) to provide time recovery in the microsecond range. By employing common-view techniques long used in GPS, the potential exists to enhance time recovery performance by over an order of magnitude using LORAN-C. The LORAN-C Accuracy Panel (run by the US Coast Guard) has sponsored a research project to collect data and determine the performance level for time recovery using common-view LORAN-C. This paper presents the results of that work.
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