GB2271237A - Emergency locator transmitter - Google Patents
Emergency locator transmitter Download PDFInfo
- 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- Withdrawn
Links
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.
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)
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)
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. |
-
1992
- 1992-10-01 GB GB9220676A patent/GB2271237A/en not_active Withdrawn
Patent Citations (5)
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)
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) |