Field tests of a buried cable sensor with intruder location

• Published in: 38th Annual 2004 International Carnahan Conference on Security Technology, 2004 pp. 177 - 181
• Main Authors: Cheal, J., O'Brien, S., Tutor, M.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway, New Jersey IEEE 2004
• Subjects: Applied sciences; Cables; Exact sciences and technology; Frequency; Information, signal and communications theory; Magnetic field measurement; Magnetic sensors; Microwave sensors; Modulation, demodulation; Pattern recognition; Radar detection; Radiolocalization and radionavigation; Sensor phenomena and characterization; Signal and communications theory; Signal processing; Soil; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Testing; Transmission and modulation (techniques and equipments); Ultra wideband technology; Near field; Phase modulation; Meteorological phenomenon; Frequency step; CW radar; Uniform field; Outdoor installation; Surface wave; Urban area; FM radar; Shape detection; Field experiment; Ultra wide band; Multiple wave; Electric field; Proximity detector; Signal processing; Environmental effect; Feature extraction; Localization; Magnetic field; Multiple frequency; Target detection
• ISBN: 9780780385061; 0780385063
• DOI: 10.1109/CCST.2004.1405388

A new buried cable sensor developed at Southwest Microwave, Inc. has been added to the Intrepid family of outdoor perimeter intrusion sensors. The sensor with the trademarked name "MICROTRACK" is similar to the "MICROPOINT" fence sensor with precise detection location, sensitivity leveling and free format zoning. Intruder location is accomplished with low-power ultra wideband frequency stepped radar driving the sensor cables. Target range resolution also allows the use of sensitivity leveling for each individual range bin. This will compensate for differences in soil conductivity along the length of the cable and for metal objects, which may be located in the near field radiation. The design of the MICROTRACK sensor was presented at the 2002 Carnahan Conference in Atlantic City. It has been described as an FM-CW radar, however it differs from the generic form in that the frequency is stepped rather than continuously swept and phase code modulation is added to discriminate against interference. The wide bandwidth of the MICROTRACK sensor fills in the nulls typical of a single frequency radar and provides a more uniform field profile along the entire length of the sensor cables. This paper describes the testing that has been performed to characterize the system for different environmental conditions. Southwest Microwave, Inc. has procured an open field site of 31 acres of tlat desert land for testing the buried cable. Another site in Canada is used for testing with an additional set of weather and soil conditions. Detection patterns, proximity to stationary objects, and various environmental factors will be discussed. Extensive measurements of both electric and magnetic fields along the length and perpendicular to the sensor cables show a detailed map of the multiple frequency surface wave. When the cables are buried, the uniformity of the field is degraded slightly but no deep nulls are observed. Site testing has confirmed major benefits of the MICROTRACK sensor: uniform detection zone; elimination of deep nulls; precise target location and sensitivity leveling.