The U. S Coast Guard and Federal Aviation Administration are cooperating in a major effort to define and analyze the performance of a new Enhanced Loran system as a backup for GPS provided services. Previous year efforts have seen successful demonstration of the modulation and demodulation of the Loran Data Channel and of the potential performance of differential Loran via both post processing and real time evaluations. The real time transmissions of the Loran data channel were limited to brief periods using the test transmitter located at the Coast Guard Loran Support Unit in Wildwood, NJ. In 2005, the Coast Guard began transmitting absolute time and differential Loran corrections on a 24 hour per day, seven day a week basis from limited number of operational stations. In 2006, this network will expand and will hopefully provide Loran data channel signals throughout virtually all of the lower 48 states by the end of the year. In conjunction with this expanding network of transmitters, our effort is focusing on the development and testing of enhanced Loran receivers for base station monitors and for user equipment for navigation and timing applications. The paper reports the results of on-air testing of the differential Loran system and a developmental Loran all- in-view receiver with data demodulation and differential capabilities.
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