RESOURCE PROTECTION BY SEGMENTED LEAKY COAX CABLES (FROM CARNAHAN CONFERENCE ON CRIME COUNTERMEASURES PROCEEDINGS, MAY 16-18, 1979, BY JOHN S JACKSON - SEE NCJ-62284)

• NCJ Number: 62302
• Author(s): K V N RAO; J L POIRIER; L D POLES; N V KARAS
• Date Published: 1979
• Length: 0 pages
• Corporate Author: Ores Publications
• Publication Format: Document
• Language: English
• Country: United States of America
• Note: *This document is currently unavailable from NCJRS.

Annotation

AN INDIVIDUAL RESOURCE PROTECTION SENSOR IS REPORTED THAT MINIMIZES SHADOWING WHEN DEPLOYED AROUND AIRCRAFT, IS INSENSITIVE TO WIND-INDUCED WING MOTION, AND HAS A WELL-CONFINED ZONE OF DETECTION.

Abstract

THE INSTRUSION SENSOR OPERATES AT VHF FREQUENCIES AND IS DESIGNED TO PROTECT HIGH-VALUE INDIVIDUAL RESOURCES. THE SYSTEM CONSISTS OF A LOOP OF LEAKY COAXIAL CABLE THAT ACTS AS A DISTRIBUTED TRANSMITTING ANTENNA ENCIRCLING THE RESOURCE. ONE OR MORE STRATEGICALLY-LOCATED MONOPOLES ACT AS RECEIVING ELEMENTS. AN INTRUDER DISTURBS THE AMBIENT FIELD AS HE OR SHE CROSSES THE LEAKY CABLE SENSOR, THUS PRODUCING A DETECTABLE CHANGE IN THE RECEIVED SIGNAL LEVEL. COMPUTED AND MEASURED VALUES FOR VARIATIONS IN RECEIVED POWER IN THE PRESENCE OF AN INTRUDER SHOW GOOD AGREEMENT ACCORDING TO AN ANALYSIS OF A SINGLE-WIRE INDIVIDUAL RESOURCE PROTECTION SENSOR. THE SINGLE-WIRE INDIVIDUAL RESOURCE PROTECTION SENSOR IS VIEWED AS AN EFFECTIVE TECHNIQUE IN PROVIDING PHYSICAL SECURITY FOR HIGH-VALUE ISOLATED RESOURCES. A PHENOMENOLGICAL THEORY DESCRIBING THE PERFORMANCE OF THE SYSTEM IS PRESENTED. THE RESPONSE OF THE SYSTEM WHEN DEPLOYED AROUND A PARKED AIRCRAFT IS SHOWN, AS WELL AS SOME RESULTS OF A SWITCHING TECHNIQUE THAT REDUCES THE IMPACT OF CABLE ATTENUATION ON DETECTION SENSITIVITY. ILLUSTRATIONS AND REFERENCES ARE INCLUDED. (DEP)