Accession Number : AD0646056

Title :   EXPERIMENTAL VLF RELATIVE NAVIGATION OF R/V ATLANTIS II, CRUISE 15.

Descriptive Note : Technical rept.,

Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

Personal Author(s) : Stanbrough, J. H.

Report Date : NOV 1966

Pagination or Media Count : 4

Abstract : An experimental long-range relative navigation system was employed on the Research Vessel ATLANTIS II of the Woods Hole Oceanographic Institution during Cruise 8 to the Indian Ocean in 1963 and Cruise 15 which circumnavigated the globe in 1965. The very low frequencies (VLF) transmitted by stations having stabilized carriers (a few parts in 1011) can be received throughout the world. Navigational information is obtained from the comparison of the received signals of two or more stations with a precision oscillator which may be computed to longitude and latitude if the starting point is known; thus, the system is relative. Reference points could be supplied to the VLF system from a satellite radio navigator that was loaned by the U.S. Navy for this cruise. Best positioning agreed to within 1-3 nautical miles from best ship's position under favorable conditions. The VLF equipment also was able to provide (1) a measure of ship's drift on station, (2) precise time and frequencies, and (3) a means for calibrating the ship's EM log at sea. (Author)

Descriptors :   *OCEANOGRAPHIC SHIPS), (*RADIO NAVIGATION, VERY LOW FREQUENCY, RADIO STATIONS, RADIO TRANSMISSION, OSCILLATORS.

Subject Categories : Underwater and Marine Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE