Radio Frequency Motion Sensor Cable Studies.
Abstract
The Radio Frequency Motion Sensor (RFMS) detects movement within interior areas by detecting the electromagnetic phase and amplitude changes caused by an intruder moving through an RF field. The RFMS consists of a transmitter, receiver, up to three transmit and receive antenna pairs, and a built-in test stimulus. When used with one transmit and receive antenna pair, the sensor can provide coverage of an enclosed rectangular area of up to 930 square meters. Coverage of irregularly shaped or partitioned areas, or areas greater than 930 square meters, can be accomplished by the use of multiple transmit and receive antenna pairs (up to three). The RFMS is an advanced sensor component of the Army's Facility Intrusion Detection System (FIDS). A search for confined field transducers to augment or be used in place of the spatial antennas of the RFMS yielded three candidates: Two types of radiax cable and common 300 ohm twin lead. Each cable was tested to determine the relative sensitivity and the shape of detection field. The 300 ohm twin lead with appropriate impedance matching gave the best overall performance. The results of the cable study are presented in this report.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1985
- Accession Number
- ADA165239
Entities
People
- R. D. Bailey
Organizations
- Melpar