DEVELOPMENT OF A POLICE HELICOPTER DF (DIRECTION FINDING) - HOMING SYSTEM (FROM CARNAHAN CONFERENCE ON ELECTRONIC CRIME COUNTERMEASURES, 1971 - PROCEEDINGS SEE NCJ-02891)

• NCJ Number: 30980
• Author(s): R P K WALLA; S G BACON
• Date Published: 1971
• Length: 23 pages
• Sponsoring Agency: Kentucky Cmssn on Law Enforcement and Crime Prevention
• Corporate Author: University of Kentucky
• Publication Format: Document
• Language: English
• Country: United States of America

Annotation

DISCUSSION OF THE DESIGN, TEST, AND EVALUATION OF A HELICOPTER HOMING SYSTEM SUITABLE FOR DIRECTION FINDING (DF) AND UTILIZING EXISTING POLICE VHF (VERY HIGH FREQUENCY) TRANSCEIVERS.

Abstract

SYSTEM APPLICATIONS INCLUDE SURVEILLANCE, VEHICLE LOCATION, NAVIGATING AID, AND POLICE JAMMING LOCATOR. VARIOUS DF AND HOMING TECHNIQUES WERE INVESTIGATED USING SEVERAL ANTANNA SYSTEMS AND DETECTION SCHEMES. FIELD TESTS CONDUCTED IN LOS ANGELES REVEALED THAT OPTIMUM PERFORMANCE WAS OBTAINED USING A LOOP ANTENNA AND THE RADIOMETRIC DETECTION PROCESS. USING THIS TECHNIQUE, HOMING CAPABILITY WAS OBTAINED FOR RANGES IN EXCESS OF 35 MILES AND FOR A RADIATED POWER OF APPROXIMATELY 1 WATT.