(NAVAJO) Project 6.1 ~ Accurate Locatin of Tlectromagnetic Pulse Source = E. A. Lewis oRTeoTiryTr To utilize the electremgnetiec signal originating from nuclear weapon detonations to determine ground zero of detonation. Secondarily to obtain the yield data that is available in the bomb pulse. PROTTPE Location of ground zero is made by use of an inverse Loran principle. The exact time the bomb pulse is reccivei at various stations is recorded. The exact time jifference in receipt of the electromagnetic pulse between =, tw 3 stations will be used to determine a hyperbolic curve which runs throuch ground zero. The point of intersection of two or more curves A-termines ground zero, There are two systems, One of the systems is ‘mown as the long base line system an? the other, the short base line system. has two sets of stations, Each system The long base line has one set of stations located in the Hawaiian Islands (Midway, Palmyra and Maui) with syn- ehronizing antenna station at Haiku, Maui, ani the other set of stations in the States (Harlingen, Texas; Blytheville, Arkansas; Kinross, Michigan, and Rome, New York) with synchronizinz antenna station at Cape Fear, North Carolina. The short base lines have one set of stations located in the “Yawaiian area (Kona, Fawaii; Papa, Mawaii; and Red Hill, Maui) the other set in California (Pittsburg, Wootlani, ani Maryville). RESULTS YEN re amy tees All stationsin both the long and short base lines successfully 6