OS , BEERcur) Project 6.1 - Accurate Looatioh’éf an Electromagnetic Pulse Source R.A. Lewis ORIRCLIVE To utilise the electromagnetic signal oririnating from nuclear vespon detonations to determine ground sero of detonation. Seoondarily to obtain the yield data that is available in the bomb pulse, ‘ EROGEDUEE Location ef ground sero is made by use of an inverse Loran principle. The exact time the bomb pulse is received at various stations is recoried. The exact time difference in receipt of the electromagnetic pulse between two stations vill be used to determine a hyperbolic curve which runs through ground sero. The point of intersection of two or sore curves determines ground sero. There we BESDLAMAILABLE COPY... abort base line or Marol System operates e net in the Hawaiian Ialends and eancther net in California, Esch net consists of one master station with slave stations connected vith microveve link 30 to 60 alles on either side. The alave stations receive and sutcmatically tranamit the bomb pulse to the master station where pulse shape and time differences are analysed. The California net has the master station located at Woodland and slave stations peer Pattedurg and Marysville. The Hawaiian net has the master station loosted at Kona, Hawaii and the slave stations at Red Hill, Maui; and Pape, Hawaii. Eaoh net will attemrt to determine one hyperbolic line or a line of ~ position and will not attempt an exact fix or exact location of ground sero. = + et The secon! system known as the long base line system has one net of stations in the Meveilan ares and ancther in the Continental U.S. Rach long a s base line net requires a synchronising trengeitter and receiving station. leeated not more than 1500 miles from the tranamitter. & mx mo = : For the Hawaiian net “15 - (5 De