Drive-by personnel monitoring system with radio link
First Claim
1. Apparatus for monitoring a plurality of persons at a plurality of preselected monitoring locations comprising:
- (a) a plurality of local units each disposed at one of said monitoring locations and associated with a person to be monitored at that location, each said local unit including detector means for determining the presence or absence of the associated person to be monitored and providing presence information accordingly, each said local unit including activation signal receiving mean for receiving a preselected activation signal transmitted through free space and report signal sending means connected to said detector means and to said receiver means for transmitting a report signal bearing said presence information through free space only in response to receipt of said activation signal; and
(b) a mobile unit including activation signal sending means for sending said activation signal through free space and report signal receiving means for detecting said report signal and recovering said presence information, whereby presence information regarding all of the persons to be monitored can be recovered by bringing said mobile unit within range of all of said monitoring locations seriatim and sending said activation signal while said mobile unit is within range of each said monitoring location.
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Accused Products
Abstract
A personnel monitoring system for monitoring presence or absence of particular individuals at preassigned monitoring locations. A local unit is provided at each monitoring location for detecting presence or absence. Each local unit is arranged for short range radio communication with a mobile unit, so that the presence or absence information from the local units may be obtained by brining the mobile unit into proximity with the various local units, as by an officer traveling near the various monitoring location in series. Each local unit may include the base unit of a standard cordless telephone, whereas the mobile unit may include the portable unit of such a telephone. The system desirably provides intercom communication between the mobile unit and the local unit when selected by the monitoring officer, so that the officer can communicate with the monitored person as desired.
32 Citations
17 Claims
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1. Apparatus for monitoring a plurality of persons at a plurality of preselected monitoring locations comprising:
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(a) a plurality of local units each disposed at one of said monitoring locations and associated with a person to be monitored at that location, each said local unit including detector means for determining the presence or absence of the associated person to be monitored and providing presence information accordingly, each said local unit including activation signal receiving mean for receiving a preselected activation signal transmitted through free space and report signal sending means connected to said detector means and to said receiver means for transmitting a report signal bearing said presence information through free space only in response to receipt of said activation signal; and (b) a mobile unit including activation signal sending means for sending said activation signal through free space and report signal receiving means for detecting said report signal and recovering said presence information, whereby presence information regarding all of the persons to be monitored can be recovered by bringing said mobile unit within range of all of said monitoring locations seriatim and sending said activation signal while said mobile unit is within range of each said monitoring location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification