• Tracking very mobile objects - including personnel in a facility, objects that are very mobile (like warehouse loading equipment etc.), that need to be actively tracked and monitored all the time.
• Tracking objects of very high value, that need "ubiquitous" security without necessarily having personnel watching over it all the time. An Active RFID solution is much better than traditional CCTV solutions, primarily because the system can be configured to trigger events in the case of any anomalous behavior, e.g. On any movement.

Technology

Active tags are self-powered - usually by a permanent voltage source like an in-built battery. Other power sources like solar powered (for outdoor use) tags are currently in development at netlink rfid^TM, for a variety of innovative uses. The voltage source is used to periodically send out active RF signals, broadcasting the ID of the tag to all available receivers, from where it can be picked up by the (software) system to "track" the tag.

Some of the newer tags have an in-built motion detector, that broadcasts signals only when the tag is in motion - which helps to extend the battery life for those tags very significantly. Although tags usually broadcast their ID's, they can also be designed to broadcast other useful information. For example, some tags can have a temperature or pressure sensor built-in, and can broadcast this information to RF sensors for "active" control.

The RFID tags utilize electro magnetic energy to send signals to program the transponder by switching the electro magnetic field on and off. The duration of the on or off-phase defines whether a low-bit or high-bit of information is being transmitted. This technique of data transfer is called Pulse Width Modulation.

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