Abstract: A security system uses tags that are able to transmit RF signals to readers located around a college campus. The tags may transmit signals periodically or in the event of an emergency. Certain locations use LF readers with exciters that trigger a signal from the tag. The security system may provide quick identification of individuals in danger.

Abstract: The invention involves the usage of radio frequency, infrared, and low frequency radio frequency to accurately track transponders (tags) that are placed on objects. Transponders about the size of a small watch or a badge that can be worn on a lapel or pocket are used. The transponders are attached to staff, assets, and/or patients. Typically, ceiling mounted readers are used. The system utilizes the readers to triangulate the position of the transponders. The transponders can triangulate to a resolution accuracy of a couple of inches to 10 feet within 4 seconds. The system is also capable of triangulating the position of tags when they are lost to IR using RF. The system works with vector floor plans (AutoCAD or Microstation). This enables the system to function so that detail doesn't deteriorate even with large areas (100,000 square feet to unlimited miles). This enables accurate reading of room labels to quickly identify exact location of tags.