PRINCIPAL OF OPERATION
The LGS incorporates two laser range finders (LRF) in an environmentally sealed housing. As the LRF rotates it sends out laser pulses and by manipulating the return pulse maps the area boundary and an additional inner boundary by measuring the distance to the surrounding objects/ground. During this process the LGS "learns" the position of existing objects and creates the basic statistics of the clutter during eight scans. As the LGS continues to operate it continuously adapts the algorithm to allow for changes in the clutter due to rain, wind (moving bushes) sun rise/set, etc. Once an intruder enters the secure area (mapped area) the LGS recognizes the changes in the clutter that are meaningful and in accordance with other parameters initiates an alarm.
CONTROL AND MONITORING
The LGS unit has an imbedded PC 104 for communication and control. A dedicated computer with LGS software is used for remote control of the system. The monitoring screen resembles a radar screen and displays the mapped/detection area. The screen can be scaled according to the existing distances. Targets appear on the screen as they are detected and tracked. Existing objects can be noted/drawn on the screen for orientation and control purposes. Areas that are not "areas of interest" can be "masked" out in the software, allowing the LGS to be customized to the site.
Safeguards Technology, Inc., 75 Atlantic Street, Hackensack, NJ 07601. Tel: 201-488-1022; Fax: 201-488-1244.