Importance

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Abstract

A system for monitoring presence of persons at preselected monitoring locations. A plurality of local units, one at each monitoring location, determines whether the monitored person is present or absent at the monitoring location and sends report signals via free space radio transmission. A mobile unit, preferably mounted in a vehicle, passes within range of the various local units in order, and hence recovers status information. Desirably, the mobile unit provides a perceptible signal to an officer in the vehicle if the monitored person is absent. Each local unit may be arranged to receive radio signals from a tag carried by the monitored person and to provide an absence indication if the tag signals are no longer received. The same radio receiver as employed to receive the tag signals may also be employed to receive a callout signal sent by the mobile unit. The local unit may be arranged to provide an audible signal to the monitored person upon receipt of a callout signal, thus instructing the monitored person to present himself for inspection by the monitoring officer. The system permits an officer driving an automobile or walking a route carrying the mobile unit to monitor the status of any individuals in a house arrest program.

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First Claim