Security and communication system with location detection
First Claim
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1. An improved security and communication system, which comprises:
- at least one portable frequency transmitter having means for sending a first signal, including a first individual identification code to identify the portable transmitter, when activated by the user;
a central processing station;
a plurality of radio frequency relays comprising receiving means for receiving said first signal and transmitting means for transmitting a second signal, each of said relays having a coverage area;
said receiving means further comprising first signal manipulation means for aiding in the determination of to which of said relays said portable frequency transmitter is closest;
each of said relays being positioned in a predetermined location such that a minimum of overlapping areas of coverage is produced for each of said relays, with said second signal including said first identification code and a second identification code to identify the relay that is transmitting the second signal;
said transmitting means of all relays producing second signals in response to said first signal, transmitting said second signal to said central processing station, said central processing station having means for determining the location of said portable radio frequency transmitter.
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Abstract
An improved security and communication system accurately and quickly locates the position of a signaling portable radio frequency transmitter. When a portable transmitter is activated, a first signal, including identification information, is emitted. The first signal is received by any of a number of radio frequency relays, the signal is manipulated and transmitted to a central processing station as a second signal. The central processing station can, by using the second signals received, either from one or a number of relay stations, determine which relay station is closest to the portable transmitter.
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Citations
18 Claims
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1. An improved security and communication system, which comprises:
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at least one portable frequency transmitter having means for sending a first signal, including a first individual identification code to identify the portable transmitter, when activated by the user; a central processing station; a plurality of radio frequency relays comprising receiving means for receiving said first signal and transmitting means for transmitting a second signal, each of said relays having a coverage area; said receiving means further comprising first signal manipulation means for aiding in the determination of to which of said relays said portable frequency transmitter is closest; each of said relays being positioned in a predetermined location such that a minimum of overlapping areas of coverage is produced for each of said relays, with said second signal including said first identification code and a second identification code to identify the relay that is transmitting the second signal; said transmitting means of all relays producing second signals in response to said first signal, transmitting said second signal to said central processing station, said central processing station having means for determining the location of said portable radio frequency transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. The improved security and communication system of claim in which said central processing station comprises a microprocessor means for identifying and reporting the location of any said relays activated and the identity of the transmitter sending said first signal.
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11. An improved security and communication system, which comprises:
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at least one portable frequency transmitter having means for sending a first signal, including a first individual identification code to identify the portable transmitter, when activated by the user; a central processing station; a plurality of radio frequency relays comprising receiving means and transmitting means, said receiving means comprising an antenna and a receiver, for receiving said first signal, said receiving means further comprising an attenuator inserted between said antenna and said receiver, said attenuator tuning said relays each to a preset range and sensitivity for receiving signals; said relays positioned in a predetermined location and having means for receiving said first signal within said range and sensitivity and immediately producing and transmitting a second signal, said second signal including said first identification code and a second identification code to identify the relay that is transmitting the second signal; said transmitting means transmitting said second signals to said central processing station whereby said central processing station is provided with data for determining the location of said portable radio frequency transmitter. - View Dependent Claims (12)
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13. An improved security and communication system, which comprises:
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at least one portable frequency transmitter having means for sending a first signal, including a first individual identification code to identify the portable transmitter, when activated by the user; a central processing station; a plurality of radio frequency relays comprising receiving means and transmitting means, said receiving means comprising an antenna and a receiver, for receiving said first signal, said receiving means further comprising a threshold detector and comparator in combination with said antenna and said receiver, said comparator preset with a threshold signal strength; said relays positioned in a predetermined location and having means for receiving said first signal and comparing said first signal with said preset threshold signal, said relay transmitting a second signal, said second signal including said first identification code and a second identification code to identify the relay that is transmitting the second signal, if said first signal exceeds said preset threshold; said transmitting means transmitting said second signals to said central processing station whereby said central processing station is provided with data for determining the location of said portable radio frequency transmitter. - View Dependent Claims (14)
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15. An improved security and communication system, which comprises:
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at least one portable frequency transmitter having means for sending a first signal, including a first individual identification code to identify the portable transmitter, when activated by the user; a central processing station; a plurality of radio frequency relays comprising receiving means and transmitting means, said receiving means comprising an antenna and a receiver, for receiving said first signal, said receiving means further comprising a precision time encoder circuit; said relays positioned in a predetermined location and having means for receiving said first signal within said range and sensitivity and immediately producing and transmitting a second signal, said second signal including said first identification code and a second identification code to identify the relay that is transmitting the second signal and the precise time said first signal was received by said relay; said transmitting means transmitting said second signals to said central processing station whereby said central processing station is provided with data for determining the location of said portable radio frequency transmitter. - View Dependent Claims (16)
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17. An improved security and communication system, which comprises:
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at least one portable frequency transmitter having means for sending a first signal, including a first individual identification code to identify the portable transmitter, when activated by the user; a central processing station; a plurality of radio frequency relays comprising receiving means and transmitting means, said receiving means comprising an antenna and a receiver, for receiving said first signal, said relays further comprising an attenuator and range selector encoder, said attenuator tuning said relays each to a preset range and sensitivity for receiving signals said range selector encoder encoding said range; said relays positioned in a predetermined location and having means for receiving said first signal within said range and sensitivity and immediately producing and transmitting a second signal, said second signal including said first identification code and a second identification code, including the range encoded, to identify the relay that is transmitting the second signal; said transmitting means transmitting said second signals to said central processing station whereby said central processing station is provided with data for determining the location of said portable radio frequency transmitter. - View Dependent Claims (18)
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Specification