GB1450236A - Intrusion detector - Google Patents

Intrusion detector

Info

Publication number
GB1450236A
GB1450236A GB2211174A GB2211174A GB1450236A GB 1450236 A GB1450236 A GB 1450236A GB 2211174 A GB2211174 A GB 2211174A GB 2211174 A GB2211174 A GB 2211174A GB 1450236 A GB1450236 A GB 1450236A
Authority
GB
United Kingdom
Prior art keywords
signal
detector
amplifier
intruder
parasitic interference
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2211174A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB1450236A publication Critical patent/GB1450236A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/06—Details
    • H01Q9/065—Microstrip dipole antennas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/56—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

1450236 Intruder detector M TACUSSEL 17 May 1974 [22 May 1973] 22111/74 Heading H4D In an intruder detector, wherein a UHF transmitter and homodyne receiver detector 4, Fig. 1, transmits an, e.g. 2,450 MHz CW radio signal into the area to be surveilled and mixes the Doppler frequency shifted echo signal from an intruder with the transmitted signal to produce a Doppler frequency beat signal, the beat signal is prevented from actuating an alarm 16 in the presence of strong parasitic interference, e.g. mains noise, or when the operation of the detector generates a disabling signal from a portable transmitter 24. The beat signal at 5 Hz per Km./hr. is fed via a main amplifier 6, insensitive to the parasitic interference, to an inhibitable amplifier 10. An auxiliary amplifier 8, including bipolar rectifiers, is sensitive to the parasitic interference and feeds the resulting rectified signal to the inhibiting input of the amplifier 10. The disabling signal at 27 MHz, modulated at 200-5,000 Hz is received at 18 and converted to IF at 455 KHz. The IF signal is then detected in the auxiliary amplifier. The homodyne receiver detector 4 can be constructed in strip line form on the back of the board bearing on its front face, the aerial 2 in the form described in Figs. 2, 3, 4 (all not shown).
GB2211174A 1973-05-22 1974-05-17 Intrusion detector Expired GB1450236A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7318501A FR2231062B1 (en) 1973-05-22 1973-05-22

Publications (1)

Publication Number Publication Date
GB1450236A true GB1450236A (en) 1976-09-22

Family

ID=9119741

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2211174A Expired GB1450236A (en) 1973-05-22 1974-05-17 Intrusion detector

Country Status (7)

Country Link
BE (1) BE815361A (en)
CH (1) CH587529A5 (en)
DE (1) DE2424278C3 (en)
ES (1) ES426923A1 (en)
FR (1) FR2231062B1 (en)
GB (1) GB1450236A (en)
IT (1) IT1011858B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005081682A2 (en) 2004-01-20 2005-09-09 Bae Systems Information And Electronic Through-the-wall motion detection utilizing radar

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2315733A1 (en) * 1975-06-23 1977-01-21 Tacussel Maurice RADAR, ESPECIALLY FOR THE SURVEILLANCE OF A PREMISES
FR2331102A1 (en) * 1975-11-07 1977-06-03 Tacussel Maurice METHOD AND INSTALLATION FOR THE REMOTE CONTROL OF A ROOM SURVEILLANCE RADAR DEVICE
FR2444944A1 (en) * 1978-12-22 1980-07-18 Brier Jean Pierre Sealed microwave movement detector - comprises oscillator with cavities and antenna on printed circuit board, and analysis circuits to sense variation of frequency
US4430645A (en) * 1981-04-07 1984-02-07 Sensormatic Electronics Corporation Surveillance system employing a dual function floor mat radiator
EP0068050A1 (en) * 1981-06-25 1983-01-05 Shorrock Developments Limited Intruder detection apparatus
DE3209093A1 (en) * 1982-03-12 1983-09-22 Hörmann GmbH, 8011 Kirchseeon DEVICE FOR MONITORING SPACE BY DOPPLER RADAR
DE3209094A1 (en) * 1982-03-12 1983-09-22 Hörmann GmbH, 8011 Kirchseeon DEVICE FOR MONITORING SPACE BY DOPPLER RADAR
FR2538188B1 (en) * 1982-12-16 1988-07-15 Dreuilhe Jacqueline OSCILLATOR FOR A DOPPLER RADAR HEAD FOR THE DETECTION OF MOVING OBJECTS
DE3336610A1 (en) * 1983-10-07 1985-04-25 Hörmann GmbH, 8011 Kirchseeon MICROWAVE CABINET
FR2575554B1 (en) * 1984-12-28 1987-01-23 Radiotechnique Compelec MICROWAVE MODULE FOR DOPPLER RADAR IN BAND K
CA1279899C (en) * 1985-08-13 1991-02-05 Notifier Company Security system with saw transmitter
US4672379A (en) * 1985-12-04 1987-06-09 Bishop Frank W Doppler radar transceiver
DE4013049A1 (en) * 1989-04-25 1990-10-31 Siemens Ag Doppler radar module circuit for object motion detection - has aerial coupled to control circuit for circuit of single active switching element for oscillator and receiver

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2779935A (en) * 1955-03-21 1957-01-29 Holmes Electric Protective Com Noise actuated disabling unit
US3668703A (en) * 1969-01-31 1972-06-06 Johnson Service Co Motion detector
US3732555A (en) * 1972-03-13 1973-05-08 Sperry Rand Corp Selective intrusion alarm system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005081682A2 (en) 2004-01-20 2005-09-09 Bae Systems Information And Electronic Through-the-wall motion detection utilizing radar
EP1714167A2 (en) * 2004-01-20 2006-10-25 BAE SYSTEMS Information and Electronic Systems Integration Inc. Method and apparatus for through-the-wall motion detection utilizing cw radar
EP1714167A4 (en) * 2004-01-20 2007-09-26 Bae Systems Information Method and apparatus for through-the-wall motion detection utilizing cw radar
US7460053B2 (en) 2004-01-20 2008-12-02 Bae Systems Information And Electronic Systems Integation Inc. Method and apparatus for through-the-wall motion detection using CW radar

Also Published As

Publication number Publication date
FR2231062B1 (en) 1977-11-10
DE2424278A1 (en) 1974-12-19
FR2231062A1 (en) 1974-12-20
BE815361A (en) 1974-11-21
DE2424278C3 (en) 1979-08-02
DE2424278B2 (en) 1978-12-07
CH587529A5 (en) 1977-05-13
IT1011858B (en) 1977-02-10
ES426923A1 (en) 1976-07-16

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee