GB9120462D0 - A location system - Google Patents

A location system

Info

Publication number
GB9120462D0
GB9120462D0 GB919120462A GB9120462A GB9120462D0 GB 9120462 D0 GB9120462 D0 GB 9120462D0 GB 919120462 A GB919120462 A GB 919120462A GB 9120462 A GB9120462 A GB 9120462A GB 9120462 D0 GB9120462 D0 GB 9120462D0
Authority
GB
United Kingdom
Prior art keywords
location system
location
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.)
Withdrawn
Application number
GB919120462A
Other versions
GB2261788A (en
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.)
IST Laboratories Ltd
Original Assignee
IST Laboratories 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 IST Laboratories Ltd filed Critical IST Laboratories Ltd
Priority to GB9120462A priority Critical patent/GB2261788A/en
Publication of GB9120462D0 publication Critical patent/GB9120462D0/en
Publication of GB2261788A publication Critical patent/GB2261788A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/08—Alarms for ensuring the safety of persons responsive to the presence of persons in a body of water, e.g. a swimming pool; responsive to an abnormal condition of a body of water
    • G08B21/088—Alarms for ensuring the safety of persons responsive to the presence of persons in a body of water, e.g. a swimming pool; responsive to an abnormal condition of a body of water by monitoring a device worn by the person, e.g. a bracelet attached to the swimmer
    • 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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/04—Details
    • G01S3/06—Means for increasing effective directivity, e.g. by combining signals having differently oriented directivity characteristics or by sharpening the envelope waveform of the signal derived from a rotating or oscillating beam antenna
    • 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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H01Q3/242—Circumferential scanning

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Transmitters (AREA)
GB9120462A 1991-09-26 1991-09-26 A location system Withdrawn GB2261788A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9120462A GB2261788A (en) 1991-09-26 1991-09-26 A location system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9120462A GB2261788A (en) 1991-09-26 1991-09-26 A location system

Publications (2)

Publication Number Publication Date
GB9120462D0 true GB9120462D0 (en) 1991-11-06
GB2261788A GB2261788A (en) 1993-05-26

Family

ID=10701991

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9120462A Withdrawn GB2261788A (en) 1991-09-26 1991-09-26 A location system

Country Status (1)

Country Link
GB (1) GB2261788A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU8068394A (en) * 1993-11-05 1995-05-23 Personal Safety Limited Warning device
GB2346753A (en) * 1998-10-21 2000-08-16 Rnli Direction finding aerials
FR2806508A1 (en) * 2000-03-20 2001-09-21 Michel Scicluna Surveillance system for person near water includes position and humidity detector worn by person, linked to signal transmitter
GB0325622D0 (en) 2003-11-03 2003-12-10 Cambridge Consultants System for determining positional information
CN105448045B (en) * 2015-03-06 2018-03-20 马科峰 Anti- drowning prevention safety safeguards system based on RFID technique

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB798218A (en) * 1955-11-23 1958-07-16 Marconi Wireless Telegraph Co Improvements in or relating to radio direction finding systems
US3996592A (en) * 1965-02-04 1976-12-07 Orion Industries, Inc. Antenna with rotatable sensitivity pattern
NL186344C (en) * 1978-04-18 1990-11-01 Mitsubishi Electric Corp RADAR BEACONS.
FR2447318A1 (en) * 1979-01-25 1980-08-22 Jaouen Jean Jacques Portable alarm equipment for solitary navigator - comprises radio which controls beat and allows transmission of distress signal
JPS58148526A (en) * 1982-02-26 1983-09-03 Mitsubishi Electric Corp Device for rescue signal
DE3600802A1 (en) * 1986-01-14 1987-07-16 Heinrich Prof Dr Ing Reents Arrangement for monitoring persons or objects which fall overboard from a ship, a floating factory or an operational facility securely anchored at sea
GB8726830D0 (en) * 1987-11-17 1987-12-23 Martin J A Monitoring system
GB8901344D0 (en) * 1989-01-21 1989-03-15 Beacham Allan Emergency rescue system

Also Published As

Publication number Publication date
GB2261788A (en) 1993-05-26

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)