Document Details


Title:
OPERATION DOMINIC, CHRISTMAS AND FISH BOWL SERIES, PROJECT OFFICERS REPORT - PROJECT 7.1, ELECTROMAGNETIC DIGNAL, UNDERWATER MEASUREMENTS (DELETED)
Subject Terms:
DOMINIC I OPERATION; ELECTROMAGNETIC RADIATION; RADIATION DETECTION; MEASURING INSTRUMENTS; GEOPHYSICAL SURVEYS; FISHBOWL SERIES; CHRISTMAS ISLAND SERIES
Document Location:
Location - NNSA/NSO Nuclear Testing Archive Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - CIC@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1985 Apr 01
Declassification Status:
Sanitized
Document Pages:
0097
Accession Number:
NV0051366
Document Number(s):
POR2033EX
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
KAMAN NUCLEAR CONDUCTED TESTS UNDER PROJECT 7.1 WITH THE OBJECTIVE OF OBTAINING MEASUREMENTS OF THE ELECTROMAGNETIC (EM) SIGNALS FROM NUCLEA R DETONATIONS AT LARGE DISTANCES FROM THE DETONATION POINT, ABOVE AND BENEATH THE SEA SURFACE. THE PLANNED USE OF THE DATA IS THAT OF DETERM INING THE FEASIBILITY OF AN INDIRECT BOMB DAMAGE ASSESSMENT (IBDA) SYS TEM BASED ON THE NUCLEAR EM SIGNATURE. THE TESTS COMPLETED UNDER PROJE CT 7.1 HAVE PROVIDED EXPERIMENTAL DATA USEFUL TO THE ABOVE REQUIREMENT S. ONE OF THE PRIMARY TASKS ACCOMPLISHED WAS A DETERMINATION OF THE AC TUAL DISTORTION OF THE EM TRANSIENT SIGNAL AS IT PROPAGATES DOWN THROU GH SEA WATER. THIS IS IMPORTANT BECAUSE THE SEA WATER HAS A CONDUCTIVI TY AND PHASE SHIFT THAT IS FREQUENCY DEPENDENT FOR VLF SIGNALS. THE RE SULTING DATA DEMONSTRATES THIS DISTORTION OF THE HIGHLY COMPLEX EM SIG NAL AND WILL HELP DEFINE THE LIMITS AND DESIRABLE SPECIFICATIONS FOR A PRACTICAL, OPERATIONAL, POLARIS-EM-IBDA SYSTEM. THE SPECIFIC TESTS WE RE CONDUCTED FROM TWO SHIPS. ONE SHIP HAD A CALIBRATED, ABOVE-WATER, W HIP ANTENNA PLUS AN UNDERWATER LONG WIRE (STANDARD SUBMARINE TYPE) ANT ENNA. THE OTHER SHIP HAD AN IDENTICAL INSTALLATION, EXCEPT THAT THE UN DERWATER ANTENNA WAS A 6-BY 6-FOOT LOOP ANTENNA SET AT VARIOUS DEPTHS. BROADBAND VIDEO OUTPUTS FROM THESE FOUR ANTENNAS WERE PRESENTED ON SC OPES AND PHOTOGRAPHED AND RECORDED ON MAGNETIC TAPE. THE EM SIGNATURES RECORDED BOTH ABOVE AND BELOW THE WATER SURFACE FOR THE VARIOUS NUCLE AR EVENTS ARE UNIQUE, RECOGNIZABLE, AND PREDICTABLE TO A USEFUL DEGREE . IT APPEARS ENTIRELY FEASIBLE TO UTILIZE THIS NUCLEAR EM SIGNAL AS A METHOD OF IBDA. THE SIGNIFICANCE OF THE DATA PRESENTED HEREIN LIES PRI MARILY IN THE DEMONSTRATED ABILITY TO DETECT AN ABOVE-WATER EM SIGNAL WITH AN UNDERWATER ANTENNA SYSTEM. SIGNAL CHARACTERISTICS ARE CHANGED IN MAGNITUDE AND PHASE BUT ARE VERY EASILY RECOGNIZABLE WITH BUT A MIN IMUM OF MEASURING EQUIPMENT. RELIABILITY OF THE DATA TAKEN ON FILM REC ORDS IS CONSIDERED TO BE GOOD BECAUSE OF THE INSTRUMENTATION AND CALIB RATIONS USED. THE INITIAL PORTION OF THE SIGNAL WAS LOST ON THE MAJORI TY OF THE SIGNALS DUE TO TRIGGERING DIFFICULTIES, BUT THE MAXIMUM AMPL ITUDE AND PHASE RELATIONSHIPS WERE RECORDED.


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