초록 ▼

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 u

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.

대표청구항 ▼

Apparatus for monitoring a plurality of persons at a plurality of preselected monitoring locations comprising: (a) a plurality of local units each disposed at a monitoring location and associated with a person to be monitored at such monitoring location, each said local unit including detector means

Apparatus for monitoring a plurality of persons at a plurality of preselected monitoring locations comprising: (a) a plurality of local units each disposed at a monitoring location and associated with a person to be monitored at such monitoring location, each said local unit including detector means for determining the presence or absence of the associated person to be monitored and providing presence or absence information accordingly, each said local unit further including report signal sending means for transmitting a report radio signal bearing said presence or absence information through free space from the monitoring location; and (b) a mobile unit including report signal receiving means for detecting the report signal from the local unit at each said monitoring location while the mobile unit is within range thereof and recovering the presence information from the detected report signal, whereby presence information regarding all of the persons to be monitored can be recovered by bringing said mobile unit within range of all said monitoring locations seriatim.