GB2271237A - Emergency locator transmitter - Google Patents

Emergency locator transmitter Download PDF

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Publication number
GB2271237A
GB2271237A GB9220676A GB9220676A GB2271237A GB 2271237 A GB2271237 A GB 2271237A GB 9220676 A GB9220676 A GB 9220676A GB 9220676 A GB9220676 A GB 9220676A GB 2271237 A GB2271237 A GB 2271237A
Authority
GB
United Kingdom
Prior art keywords
transmitter
geographical position
emergency locator
determining
emergency
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Withdrawn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
GB9220676A
Other versions
GB9220676D0 (en
Inventor
John Malcolm Copeland
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
Priority to GB9220676A priority Critical patent/GB2271237A/en
Publication of GB9220676D0 publication Critical patent/GB9220676D0/en
Publication of GB2271237A publication Critical patent/GB2271237A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/42—Determining position
    • 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
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/14—Receivers specially adapted for specific applications

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

An emergency locator transmitter is combined with a GPS receiver for determining the geographical position of the transmitter. The transmitter transmits radio signals for location and homing purposes which include information on the geographical position of the transmitter. <IMAGE>

Description

EMERGENCY LOCATOR TRANSMITTER This invention relates to emergency locator transmitters.
These devices are widely used, but not exclusively, in the aviation and marine environments. They are also described by a variety of terms such as Emergency Locator Beacons, Radio Distress Beacons or Personal Locator Beacons. For the purpose of this invention, the term emergency locator transmitter (ELT) will be used to cover all applications.
The essential feature of an ELT is that it is a radio transmitter which is activated in case of an emergency. It transmits a radio signal on one or more frequencies reserved for emergency use only. The transmissions act as a beacon enabling search and rescue services to locate the transmitter.
For a variety of reasons the transmissions have only a limited range. It is therefore necessary to know the approximate position of the beacon before a detailed search can be made to pinpoint its exact location. This difficulty is increasingly being overcome by the use of suitable receivers in satellites.
The information received from one or more satellites then has to be processed by ground stations to determine an approximate position, prior to making a detailed search. This can take a significant time and the approximate location can cover a very large area. The ELT may transmit for only a relatively short period.
According to this invention, there is provided an emergency locator transmitter in combination with means for determining the geographical position of the transmitter, which transmits radio signals for location and homing purposes and includes in the transmitted radio signals information on the geographical position of the transmitter.
Preferably the said means for determining the geographical position of the transmitter is by means of a satellite based navigation system. Such a satellite based navigation system, known as the Global Positioning System (GPS), enables groundbased receivers to determine the geographical position of the receiver with great accuracy. The components within such a receiver which enable this calculation to be made could be incorporated in an ELT without a significant increase in the size or weight of the ELT. Figure 1 illustrates the essential components of such a system.
Position information could be transmitted on first activation of the ELT. Thereafter it could be transmitted intermittently. This could be achieved automatically or by manual control. Because of the accuracy of the information transmitted, the periods of transmission could be reduced to extend the overall period of operation on the limited battery power available. A variety of methods for using this position information and ways of transmitting it by the ELT can be envisaged. They are not central to the basic claims of this invention.

Claims (2)

1. An emergency locator transmitter, in combination with a means for determining the geographical position of the transmitter, which transmits radio signals for location and homing purposes and includes in the transmitted radio signals information on the geographical position of the transmitter.
2. A transmitter according to Claim 1 wherein the said means for determining the geographical position of the transmitter is by means of a satellite based navigation system.
GB9220676A 1992-10-01 1992-10-01 Emergency locator transmitter Withdrawn GB2271237A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9220676A GB2271237A (en) 1992-10-01 1992-10-01 Emergency locator transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9220676A GB2271237A (en) 1992-10-01 1992-10-01 Emergency locator transmitter

Publications (2)

Publication Number Publication Date
GB9220676D0 GB9220676D0 (en) 1992-11-11
GB2271237A true GB2271237A (en) 1994-04-06

Family

ID=10722797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9220676A Withdrawn GB2271237A (en) 1992-10-01 1992-10-01 Emergency locator transmitter

Country Status (1)

Country Link
GB (1) GB2271237A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0670503A1 (en) * 1994-03-03 1995-09-06 Telia Ab Alarm transmitter with radio locating device
FR2731289A1 (en) * 1995-03-02 1996-09-06 Mandereau Eric Personal safety improving method
GB2292496B (en) * 1993-05-14 1997-08-27 Worldwide Notific Syst Apparatus and method for closing flight plans and locating aircraft

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1484452A (en) * 1973-09-12 1977-09-01 Pains Wessex Ltd Buoyant radiobeacons
GB1518971A (en) * 1976-06-01 1978-07-26 Standard Telephones Cables Ltd Marine disaster alert device
US4547778A (en) * 1981-06-09 1985-10-15 Texas Instruments Incorporated Method and apparatus for automatic distress call signal transmission
US4833477A (en) * 1987-08-12 1989-05-23 Tendler Robert K Emergency vessel location system
EP0467651A1 (en) * 1990-07-19 1992-01-22 Motorola, Inc. Satellite-based cellular communication system with position aided subscriber unit.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1484452A (en) * 1973-09-12 1977-09-01 Pains Wessex Ltd Buoyant radiobeacons
GB1518971A (en) * 1976-06-01 1978-07-26 Standard Telephones Cables Ltd Marine disaster alert device
US4547778A (en) * 1981-06-09 1985-10-15 Texas Instruments Incorporated Method and apparatus for automatic distress call signal transmission
US4833477A (en) * 1987-08-12 1989-05-23 Tendler Robert K Emergency vessel location system
EP0467651A1 (en) * 1990-07-19 1992-01-22 Motorola, Inc. Satellite-based cellular communication system with position aided subscriber unit.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2292496B (en) * 1993-05-14 1997-08-27 Worldwide Notific Syst Apparatus and method for closing flight plans and locating aircraft
EP0670503A1 (en) * 1994-03-03 1995-09-06 Telia Ab Alarm transmitter with radio locating device
FR2731289A1 (en) * 1995-03-02 1996-09-06 Mandereau Eric Personal safety improving method

Also Published As

Publication number Publication date
GB9220676D0 (en) 1992-11-11

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)