JPS56108189A - Radio frequency detector and approach control system using same - Google Patents

Radio frequency detector and approach control system using same

Info

Publication number
JPS56108189A
JPS56108189A JP101681A JP101681A JPS56108189A JP S56108189 A JPS56108189 A JP S56108189A JP 101681 A JP101681 A JP 101681A JP 101681 A JP101681 A JP 101681A JP S56108189 A JPS56108189 A JP S56108189A
Authority
JP
Japan
Prior art keywords
control system
same
radio frequency
frequency detector
approach control
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.)
Pending
Application number
JP101681A
Other languages
English (en)
Inventor
Rejinrudo Teiraa Deritsuku
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.)
Mastiff Security Systems Ltd
Original Assignee
Mastiff Security Systems Ltd
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 Mastiff Security Systems Ltd filed Critical Mastiff Security Systems Ltd
Publication of JPS56108189A publication Critical patent/JPS56108189A/ja
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/14—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by heterodyning; by beat-frequency comparison
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/15—Indicating that frequency of pulses is either above or below a predetermined value or within or outside a predetermined range of values, by making use of non-linear or digital elements (indicating that pulse width is above or below a certain limit)
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/28—Individual registration on entry or exit involving the use of a pass the pass enabling tracking or indicating presence

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Burglar Alarm Systems (AREA)
JP101681A 1980-01-07 1981-01-07 Radio frequency detector and approach control system using same Pending JPS56108189A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8000357 1980-01-07

Publications (1)

Publication Number Publication Date
JPS56108189A true JPS56108189A (en) 1981-08-27

Family

ID=10510467

Family Applications (1)

Application Number Title Priority Date Filing Date
JP101681A Pending JPS56108189A (en) 1980-01-07 1981-01-07 Radio frequency detector and approach control system using same

Country Status (4)

Country Link
EP (1) EP0032130A1 (ja)
JP (1) JPS56108189A (ja)
AU (1) AU6597381A (ja)
ZA (1) ZA8172B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0299492U (ja) * 1989-01-23 1990-08-08
US5808587A (en) * 1994-03-24 1998-09-15 Hochiki Corporation Wireless access control system using a proximity member and antenna equipment therefor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5083113A (en) * 1990-01-31 1992-01-21 Texas Instruments Incorporated Inductive coupled object identification system and method
GB2283844B (en) * 1993-11-13 1997-06-11 Nokia Mobile Phones Ltd Detection of pager signal in FM radio transmission
US5533058A (en) * 1994-03-10 1996-07-02 Delco Electronics Corporation Method and apparatus for low current RF signal detection

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3812427A (en) * 1972-08-17 1974-05-21 Tull Aviation Corp Method and apparatus for monitoring frequency
DE2356961A1 (de) * 1972-11-21 1974-05-22 Schlumberger Overseas Verfahren zur messung der frequenzabweichung eines senders und schaltung zu seiner durchfuehrung
GB1487073A (en) * 1974-10-11 1977-09-28 Pentel Kk Communication system including a response analyser for receiving different frequency signals
CA1033015A (en) * 1976-04-09 1978-06-13 Roger C. Palmer Microwave frequency counter
US4137497A (en) * 1977-10-31 1979-01-30 Raythoon Company Frequency measuring apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0299492U (ja) * 1989-01-23 1990-08-08
US5808587A (en) * 1994-03-24 1998-09-15 Hochiki Corporation Wireless access control system using a proximity member and antenna equipment therefor

Also Published As

Publication number Publication date
ZA8172B (en) 1982-08-25
AU6597381A (en) 1981-07-16
EP0032130A1 (en) 1981-07-15

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