NCJ Number
107782
Date Published
1987
Length
191 pages
Annotation
This study examines the factors that affect the sensitivity of the Ported Coaxial Cable Sensor (PCCS) system and develops a deployment scheme to differentiate between human intruders and small animals, to aid efforts to control international borders and prevent intrusions.
Abstract
The PCCS system is a line-guided radar that uses two parallel leaky (ported) coaxial cables that distribute electromagnetic fields and that experience variations in energy if an intruder is present. The experimental analysis compared the measured response profile of the test system against variations of cable separation distance, soil conductivity and permittivity, and magnetic field intensity above the transmitter cable. Higher conductivity and permittivity of the burial medium resulted in a decrease in the strength of the magnetic field above the transmitter cable, resulting in a decrease in response number. Results were compared with the results obtained from a theoretical analysis of a simplified model. The analysis concluded that an experimentally derived relationship between cable separation distance and response number, which is valid for all types, can be applied to predictably minimize variations in sensitivity, producing a response ratio for each cell that will not exceed 3 to 1. Data tables, figures, appended data and theoretical background, and 24 references.