(OSAGE) i of Electromagnetic Project 6.1 = Accurate Locatfal Pulse Source ~ Dr. E. A. Lewis Objective To utilize the electromagnetic 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, 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 zero, The point of intersection of two or more curves det~ ermineg ground zero, There are two systems being tested. One system known as the short base line or Narol System operates a net in the Hawaiian Islands and another net in California. Each net consists of one master station with slave stations connected with microwave link 30 to 60 miles on either side, The slave stations receive and automatically transmit the bomb pulse to the master station where pulse shape and time differences are analyzed, The California net has the master station located at Woodland and slave stations near Pittsburgh and Marysville. The Hawaiian net has the master station located at Kona Hawaii and the slave stations at Red Hill, Maui; and Papa, Hawaii. Each net will attempt to determine one hyperbolic line or a line of position and will not attempt an exact fix or exact location ‘nag8 of ground zero,