tai Project 6.1 = Accurate Location of an Electromarnetic Pulse Source - £E,A. Lewie QRIECTIVE To utilise the eloctromagnetic signal originating from nuclear weapon detonations to determine ground sero of detonation, Secondarily to obtain the yleld data that is available in the borb pulse. PROCEDURE Location of ground zero is made by use of an inverse Loran principle, The exact time the bomb pulse is received at various stations is recorded, The exact time difference in receipt of the electromagnetic pulse between two stations will be used to determine a hyperbolic curve which runs through ground zcro, The point of intersection of two or more curves deterrines. ground zero, There are two systems, One of the systems is known as the lonp base line system and the other the short base line system, sets of stations, Fach system has two The long base line has one set of stations located in the Hawaiian Islands (Midway, Palmyra and Maui) with synchronizing antenna station at Haiku, Maui, and the other set of stations in the States (Harlington, Texas; Blytheville, Arkansas; Kinross, Michigan and Rome, New York) with synchronizing antenna stetion at Cape Fear, North Carolina. The short base lines’ have one set of stations located in the Hawaiian area (Kona, Hawaiiy Papa, Hawaiis and Red Hill, Maui) the other set in California (Pittsburg, Woodland, and Maryville). Reetiis SNL All atations in both the long and short base lines successfully reccived and recorded the wave form of the electromagnetic pulse emanating from the bomb detonation, Line of position and fix errors will be reported in the Project 6.1 report, - 28 -