More info here: hxxp://www.insidegnss.com/node/551
(change xx to tt , sorry many ads on this linked site) " Since 1999, Congress has allocated $160 million to begin the eLORAN improvements, according to a presentation by USCG Capt. Curt Dubay to the U.S. Space-Based PNT Executive Committee last October. Of the 24 U.S. LORAN-C stations; 19 have been updated and modernized to transmit the extra data services required for eLORAN, but a monitoring network has not yet been installed. No funds have been allocated since FY06, however, and a full eLoran system would cost up to $400 million more with an expected annual allocation of $15–$25 million, Dubay said. Annual LORAN operations and maintenance costs (as of FY06) are $45 million, a figure expected to decline to a projected $22 million a year upon implementation of full eLORAN system architecture with reduced staffing at automated stations. Improvements have included the following: • upgrade existing station transmitting equipment to new solid state transmitters and associated timing equipment (atomic clocks) • transition to time of arrival (TOA) positioning techniques, similar to pseudorange-based navigation used in GPS • incorporate new messaging channel to increase position and time accuracy (differential Loran, integrity, and time messages) • support operation of modern all-in-view equipment (improves fix geometry for better accuracy and extended coverage). Modernization of LORAN improves the system’s positioning accuracy from between 0.25 and 1 nautical mile to between about 3 and 20 meters." _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
