Patent US3727216A successfully refreshed from Google Patents.
US3727216A
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US
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Electromagnetic and ultrasonic doppler correlation intrusion alarm system
Assignee: Mosler Safe Co
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Filing: 1971-01-28
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Granted: 1973-04-10
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Expires: 1991-01-28
Abstract
Abstract An intrusion alarm system includes an electromagnetic doppler sub-system and an ultrasonic doppler sub-system having outputs correlated to trigger an alarm. A threshold signal is produced when the detected ultrasonic doppler signal reaches a given level to open a gate. The electromagnetic doppler frequency signal is converted to a doppler frequency square wave which passes as a series of pulses through the opened gate. These pulses actuate an accumulator which is provided with a timed reset, which clears the accumulator at a specified time after the first pulse sets the timer, unless a prescribed minimum number of pulses have accumulated within the specified time to cause the alarm to be actuated.
Inventors
- 👤 J Antonio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:20
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/56; G01S13/86; G01S13/862; G08; G08B; G08B13/00; G08B13/16; G08B13/1609; G08B13/1645
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
254 words
An intrusion alarm system comprising: an electromagnetic space alarm sub-system including: a radio frequency transmitter for transmitting electromagnetic energy into an area being surveyed, an antenna for receiving said radiation as reflected from objects within the area, a mixer having inputs connected to said transmitter and said antenna for producing at its output a doppler frequency signal derived from said radiated energy and from the energy reflected from a moving intruder, and means for producing doppler frequency pulses from the output of said electromagnetic sub-system mixer; an ultrasonic space alarm sub-system including: means for radiating ultrasonic energy into said area, means for receiving said energy as reflected from objects within said area, means for producing a signal proportional to the doppler frequency component of the received reflected ultrasonic energy within a given doppler frequency band, and means for producing a threshold signal when said detected signal exceeds a predetermined threshold value; a correlation sub-system including: a coincidence circuit having inputs for receiving said electromagnetic doppler pulses and said ultrasonic threshold signal, and having an output bearing doppler frequency pulses upon the coincidence of said electromagnetic doppler frequency pulses and said ultrasonic threshold signal at the inputs of said coincidence circuit, accumulator means connected to the output of said coincidence circuit and operative to generate an output signal in response to a predetermined number of pulses at the accumulator input, and alarm means connected to the output of said accumulator and operative to signal an alarm in response to the output signal from said accumulator.
Claim 2
Dependent Claim
254 words
An intrusion alarm system comprising: an electromagnetic space alarm sub-system including: a radio frequency transmitter for transmitting electromagnetic energy into an area being surveyed, an antenna for receiving said radiation as reflected from objects within the area, a mixer having inputs connected to said transmitter and said antenna for producing at its output a doppler frequency signal derived from said radiated energy and from the energy reflected from a moving intruder, and means for producing doppler frequency pulses from the output of said electromagnetic sub-system mixer; an ultrasonic space alarm sub-system including: means for radiating ultrasonic energy into said area, means for receiving said energy as reflected from objects within said area, means for producing a signal proportional to the doppler frequency component of the received reflected ultrasonic energy within a given doppler frequency band, and means for producing a threshold signal when said detected signal exceeds a predetermined threshold value; a correlation sub-system including: a coincidence circuit having inputs for receiving said electromagnetic doppler pulses and said ultrasonic threshold signal, and having an output bearing doppler frequency pulses upon the coincidence of said electromagnetic doppler frequency pulses and said ultrasonic threshold signal at the inputs of said coincidence circuit, accumulator means connected to the output of said coincidence circuit and operative to generate an output signal in response to a predetermined number of pulses at the accumulator input, and alarm means connected to the output of said accumulator and operative to signal an alarm in response to the output signal from said accumulator.
Claim 3
Dependent Claim
14 words
An alarm system according to claim 1 wherein said accumulator is an analog accumulator.
Claim 4
Dependent Claim
14 words
An alarm system according to claim 1 wherein said accumulator is a digital accumulator.
Claim 5
Dependent Claim
73 words
An alarm system according to claim 1 wherein said coincidence sub-system further comprises: an interval timer for generating at its output a reset pulse at a predetermined time interval after a pulse at its its input, said timer having its input connected to the output of said coincidence circuit and having its output connected to a reset input of said accumulator so as to reset said accumulator in response to said reset pulse.
Claim 6
Dependent Claim
284 words
An intrusion alarm system comprising: a first space alarm sub-system including: a transmitter for transmitting energy into an area being surveyed, an antenna for receiving said radiation as reflected from objects within the area, a mixer having inputs connected to said transmitter and said antenna for producing at its output a doppler frequency signal derived from said radiated energy and from the energy reflected from a moving intruder, and means for producing doppler frequency pulses from the output of said first sub-system mixer; a second space alarm sub-system including: means for radiating energy into said area, said energy having properties different than the energy radiated by said first sub-system, means for receiving said energy as reflected from objects within said area, means for producing a signal proportional to the doppler frequenCy component of the received reflected energy within a given doppler frequency band, and means for producing a threshold signal when said detected signal exceeds a predetermined threshold value; a correlation sub-system including: a coincident circuit having inputs for receiving said doppler pulses from said first sub-system and said threshold signal from said second sub-system, and having an output bearing doppler frequency pulses corresponding to said doppler frequency pulses from said first sub-system upon the coincidence of said doppler frequency pulses from said first sub-system and said threshold signal from said second sub-system at the inputs of said coincidence circuit, accumulator means connected to the output of said coincidence circuit and operative to generate an output signal in response to a predetermined number of pulses at the accumulator input; and alarm means connected to the output of said accumulator and operative to signal an alarm in response to the output signal from said accumulator.
Claim 7
Dependent Claim
284 words
An intrusion alarm system comprising: a first space alarm sub-system including: a transmitter for transmitting energy into an area being surveyed, an antenna for receiving said radiation as reflected from objects within the area, a mixer having inputs connected to said transmitter and said antenna for producing at its output a doppler frequency signal derived from said radiated energy and from the energy reflected from a moving intruder, and means for producing doppler frequency pulses from the output of said first sub-system mixer; a second space alarm sub-system including: means for radiating energy into said area, said energy having properties different than the energy radiated by said first sub-system, means for receiving said energy as reflected from objects within said area, means for producing a signal proportional to the doppler frequenCy component of the received reflected energy within a given doppler frequency band, and means for producing a threshold signal when said detected signal exceeds a predetermined threshold value; a correlation sub-system including: a coincident circuit having inputs for receiving said doppler pulses from said first sub-system and said threshold signal from said second sub-system, and having an output bearing doppler frequency pulses corresponding to said doppler frequency pulses from said first sub-system upon the coincidence of said doppler frequency pulses from said first sub-system and said threshold signal from said second sub-system at the inputs of said coincidence circuit, accumulator means connected to the output of said coincidence circuit and operative to generate an output signal in response to a predetermined number of pulses at the accumulator input; and alarm means connected to the output of said accumulator and operative to signal an alarm in response to the output signal from said accumulator.
Claim 8
Dependent Claim
213 words
An intrusion alarm system comprising: a first space alarm sub-system including: a transmitter for transmitting energy into an area being surveyed, an antenna for receiving said radiation as reflected from objects within the area, a mixer having inputs connected to said transmitter and said antenna for producing at its output a doppler frequency signal derived from said radiated energy and from the energy reflected from a moving intruder, and means for producing doppler frequency pulses from the output of said first sub-system mixer; a second alarm sub-system operative to generate an output in response to an alarm condition; a correlation sub-system including: a coincident circuit having inputs for receiving said doppler pulses from said first sub-system and said output signal from said second sub-system, and having an output bearing a signal corresponding to the coincidence of said doppler frequency pulses from said first sub-system and the output signal from said second sub-system at the inputs of said coincidence circuit, accumulator means connected to the output of said coincidence circuit and operative to generate an output signal in response to a predetermined number of pulses at the accumulator input; and alarm means connected to the output of said accumulator and operative to signal an alarm in response to the output signal from said accumulator.
Claim 9
Dependent Claim
213 words
An intrusion alarm system comprising: a first space alarm sub-system including: a transmitter for transmitting energy into an area being surveyed, an antenna for receiving said radiation as reflected from objects within the area, a mixer having inputs connected to said transmitter and said antenna for producing at its output a doppler frequency signal derived from said radiated energy and from the energy reflected from a moving intruder, and means for producing doppler frequency pulses from the output of said first sub-system mixer; a second alarm sub-system operative to generate an output in response to an alarm condition; a correlation sub-system including: a coincident circuit having inputs for receiving said doppler pulses from said first sub-system and said output signal from said second sub-system, and having an output bearing a signal corresponding to the coincidence of said doppler frequency pulses from said first sub-system and the output signal from said second sub-system at the inputs of said coincidence circuit, accumulator means connected to the output of said coincidence circuit and operative to generate an output signal in response to a predetermined number of pulses at the accumulator input; and alarm means connected to the output of said accumulator and operative to signal an alarm in response to the output signal from said accumulator.
Claim 10
Dependent Claim
20 words
An alarm system according to claim 6 wherein said doppler frequency lies in or near the sub-audible range of frequencies.
Claim 11
Dependent Claim
30 words
An alarm system according to claim 7 wherein said radiated energy is electromagnetic radiated energy in the order of approximately 915 MHz and said doppler frequency is approximately 1-10 Hz.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |