Omega Measurements: Rome, New York. Omega VLF Phase Difference Data Series. Volume 1. Data for Period March 1966 - December 1970.
NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF
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The data documented in this series TD 391-417 consist of measurements of the relative phase difference of signals from various pairings of Omega stations, or lines of position LOPs, as observed at several monitoring sites around the world. The data have been categorized according to both receiving site location and mode of transmission operation being used by the Omega Navigation System at the time. Most of the volumes in the series cover the absolute mode of operation used from 1966 to 1970 and to the present, but not documented here. The remaining volumes cover the synchronized mode used from 1960 to 1965. Much of the data being documented was obtained at monitoring, or synchronizing, sites located within about 30 kilometers of each transmitter and at NELC. The monitoring configuration was such that the observed phase difference would be increased by a decrease in phase delay of the second designated station usually the local transmitter. In the synchronized mode, a master-slave relationship was used wherein the slave stations acted as in-phase reflectors of the received master signals. The local synchronizing sites observed all signals and controlled the phase of the quartz oscillators at the nearby transmitters. LOPs were recorded as slave minus master at all sites. When the master signal was observed at its local site, the resulting LOP represented the roundtrip phase delay over the propagation path to the particular slave station.
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