Personnel locator system
First Claim
1. A personnel locator system installable on a premises comprising at least one portable communication unit adapted to be carried by an individual and monitored at appropriate locations about the premises, said system including:
- means for generating pulses defining a pulse train wherein said pulses occur at a predetermined frequency;
means for determining discrete time intervals defining burst periods, wherein groups of said burst periods define a burst spectrum;
infrared means for transmitting said pulse train generated by said means for generating pulses during selected ones of said burst periods; and
means responsive to said pulse train transmitted during said selected ones of the burst periods for producing a signal responsive thereto.
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0 Petitions
Accused Products
Abstract
A personnel locator system for monitoring the locations of classes of pernel. Members of classes of personnel carry portable, infrared transmitters which transmit pulse trains during discrete burst periods. Transmitters carried by members of different classes of personnel transmit pulse trains of different, predetermined frequencies to identify the classes, and transmit the pulse trains during distinct burst periods to prevent phase synchronization between pulse trains transmitted by the different transmitters. Infrared receivers are positioned to receive the transmitted pulse trains in order to monitor the continued presence locations of the members of the classes of personnel. The system utilizes pulse trains having pulses of short pulse widths during a relatively long time period in order to allow increased battery life while transmitting at high energy levels to saturate the area of reception. The pulses are of less than 40 microseconds during a 55 millisecond time frame.
241 Citations
32 Claims
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1. A personnel locator system installable on a premises comprising at least one portable communication unit adapted to be carried by an individual and monitored at appropriate locations about the premises, said system including:
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means for generating pulses defining a pulse train wherein said pulses occur at a predetermined frequency; means for determining discrete time intervals defining burst periods, wherein groups of said burst periods define a burst spectrum; infrared means for transmitting said pulse train generated by said means for generating pulses during selected ones of said burst periods; and means responsive to said pulse train transmitted during said selected ones of the burst periods for producing a signal responsive thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A registry system for maintaining a registry of the locations of defined classes of personnel, said registry system including:
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a portable transmitter carried by each of the members of each of the defined classes of personnel, each portable transmitter including means for generating pulses defining a pulse train, wherein said pulses occur at a predetermined frequency, said predetermined frequency identifying the portable transmitter carried by the members of each of the classes;
means for determining discrete time intervals defining burst periods wherein groups of said burst periods form a burst spectrum; and
a transmitting means for transmitting said pulse train during selected ones of said burst periods wherein the predetermined frequency defining the pulse train generated by each portable transmitter carried by members of each of the defined classes of personnel has values for differentiating between said classes of personnel;receiving means comprised of a plurality of spaced-apart discrete receivers, each of said discrete receivers having a defined reception range, for receiving said pulse trains generated by the portable transmitters when any of said transmitters is within the defined reception range of individual ones of the discrete receivers; and central recording means coupled to the receiving means for recording those times in which a particular discrete receiver receives pulse train generated by a portable transmitter to thereby register the location of a member of a class of personnel carrying the transmitter. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A personnel locator system installable on a premises comprising at least one portable communication unit adapted to be carried by an individual and monitored at appropriate locations about the premises, said system including:
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multivibrator means for generating a pulse train having square wave pulses occurring at predetermined frequencies; pulse shaping means coupled to receive said pulse train generated by the multivibrator means for shaping the pulses of the pulse train into pulses having pulse widths of five microseconds; means for determining discrete time intervals defining burst periods of fifty-five milliseconds in duration, wherein groups of ten burst periods define a burst spectrum; infrared emitters for transmitting said pulses of the pulse train during two of said burst periods of each burst spectrum; means for powering said infrared emitters, said means for powering including a battery connected in parallel with a capacitor, wherein said battery generates a current for charging the capacitor, and wherein discharge of the capacitor powers the infrared emitters such that the infrared emitters operate at high intensity levels during said discharge; infrared detectors for detecting infrared emitted by the infrared emitters; means for generating a signal in response to those times in which said infrared detectors detect transmission of the pulse train; and annunciating means coupled to receive said signal generated by said means for annunciating those times in which said pulse train is detected. - View Dependent Claims (27, 28, 29, 30, 31)
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32. An infrared transmitter including:
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means for generating pulses defining a pulse train wherein said pulses occur at a predetermined frequency; means for determining discrete time intervals defining burst periods, wherein groups of said burst periods define a burst spectrum; and infrared means for transmitting said pulse train generated by said means for generating pulses during selected ones of said burst periods.
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Specification