WO1989005460A1 - Buoy and watercraft drift warning system - Google Patents
Buoy and watercraft drift warning system Download PDFInfo
- Publication number
- WO1989005460A1 WO1989005460A1 PCT/GB1988/001066 GB8801066W WO8905460A1 WO 1989005460 A1 WO1989005460 A1 WO 1989005460A1 GB 8801066 W GB8801066 W GB 8801066W WO 8905460 A1 WO8905460 A1 WO 8905460A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- warning system
- remote unit
- unit
- buoy
- drift
- 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.)
- Ceased
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
- G01S19/40—Correcting position, velocity or attitude
- G01S19/41—Differential correction, e.g. DGPS [differential GPS]
-
- 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
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
- G01S13/76—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted
- G01S13/765—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein pulse-type signals are transmitted with exchange of information between interrogator and responder
-
- 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
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/09—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing processing capability normally carried out by the receiver
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B2021/003—Mooring or anchoring equipment, not otherwise provided for
- B63B2021/009—Drift monitors
Definitions
- the present invention relates to the monitoring of the positions of buoys, such as navigation buoys, or watercraft that are moored or anchored, for example ships in a harbour or yachts in a marina.
- buoys such as navigation buoys, or watercraft that are moored or anchored, for example ships in a harbour or yachts in a marina.
- An essential feature of any navigation buoy is that its exact position is known and maintained. At present, buoys must be checked physically at regular intervals to check that they have not drifted. In roughweather it can be impossible to check the buoys and, as that is the time that they are most likely to drift, dangerous situations can develop.
- Drifting of moored or anchored watercraft can also cause problans. There are thousands of craft moored or anchored at any one time and the losses caused by drifting of craft are considerable. The checking of craft in harbours, marinas, etc relies on visual checks and it is difficult for comprehensive checks to be carried out regularly.
- the object of the invention is to provide a means of automatically checking the position of a buoy or craft and providing a warning if it has drifted.
- the invention provides a drift warning system for a remote unit comprising: a) means to determine the position of the remote unit; b) means to store an initial position of the remote object; c) means to compare the present position of the remote unitwith the initial position; and d) means to activate a warning signal if the present position is outside a predetermined error range from the initial position.
- the remote unit itself may be a buoy or any type ofwatercraft suchas a ship or a yacht.
- the means to determine the position includes a receiver, mounted at the remote unit, responsive to global positioning information transmitted by earth satellites.
- the receiver is responsive to global positioning information from aGlobal Positioning Systemused in theDifferentialMode to detect changes in the position of the remote unit, as this provides greater positional accuracy.
- a central monitoring unit is provided at which a warning signal is activated andwhich can monitor several remote units concurrently.
- the receiver may include its own processing capability but advantageously it acts as a relay such that all the information received from satellites is passed via the relay and processed at the central monitoring unit.
- the means to store the initial position and the means to compare the present and initial positions of the remote unit comprise processing means, such as a programmed microprocessor.
- the initial position of the remote unit is entered into the processing means when the remote unit is set in place, moored or anchored as the case may be.
- Preferably allowable errors from the initial position are programmmed into the processing means.
- the processing means may be at the central monitoring unit or at the remote unit.
- the central unit preferably includes a transmitter to transmit interrogation signals to the remote unit and a receiver to receivepositional information from the remote unit.
- the remote unit includes a transponder responsive to the interrogation signals from the central unit and a transmitter to transmit data relating to its position to the central unit, which is activated by the transponder in response to an interrogation signal from the central unit.
- the remote station unit canbe interrogatedondemand or by repeated automatic interrogations.
- the remote unit preferably includes means to enter the initial position into the processing means when the remote station is set in position or moored etc.
- the remote unit also includes a transmitter to transmit information to the central unit and advantageously also includes warning signal means at the remote station. If the processing means detects an error in the remote unit position the processing means activates the transmitter to send a signal to the central unit to activate the warning signal.
- the transmitter also transmits data identifying the remote unit and detailing the positional error.
- the remote unit processor automatically informs the central unit if there is an error in position.
- the remote unit may also include transponder means responsive to interrogation signals from the central unit which activates the transmitter to transmit positional data to the central unit in response to an interrogation signal. This enables the remote unit positions to be checked on demand or scanned automatically.
- a warning signal at the buoy can be effected by the processing means causing the visual signalling to be altered, to alert shipping that the buoy is off station.
- the warning signal at the central unit may be of any convenient form such as an audio or a visual alarm.
- Advantageously display means may be provided at the central unit to display positional data relating to a plurality of remote units.
- Figure 1 shows a schematic diagram of one form of a buoy drift warning system according to the invention
- Figure 2 shows a schematic diagramof analternativeformof a buoy drift warning system.
- a buoy is positioned remotely from a central monitoring unit 2.
- a global positioning system (GPS) receiver or receiver acting as a relay
- a presetter 4 enables the desired latitude and longitude co-ordinates of the buoy 1 to be set.
- Adata link 5 links the buoy 1 with the central unit 2.
- the central unit2 includes a receiver/transmitter 6 for receiving and transmitting data over the data link 5.
- Aprocessor 7 isprogrammed to store the positional data relating to the buoy 1 when it is set in its initial position. The processor 7 is progra ⁇ med to activate an interrogator 8 at regular intervals.
- the interrogator 8 causes an interrogation signal to be sent over the data link 5 to the buoy 1.
- the interrogation signal is input to a transponder 9 which activates a transmitter 10 to transmit GPS positional data relating to the buoy 1 back to the central unit 2.
- TheGPS data is received by the receiver 6 and input to the processor 7.
- the processor 7 compares the present position of the buoy 1 with the stored initial position and if the present position is outside a preprogrammed error range the processor displays a warning signal on a display 11.
- the system uses GES in what is called the Differential Mode.
- the buoy 1 also includes a battery power supply 12.
- FIG. 2 shows an alternative buoy drift warning system that is particularly suitable for major navigation buoys.
- a buoy 21 is located remotely from a central monitoring unit 22.
- the buoy 21 contains a GPS receiver 23 for receiving information from earth satellites.
- a presetter 24 enables the latitude and longitude co-ordinates of the buoy's initial position to be input to a processor 25.
- the GPS data received by the receiver 23 is input into the processor 25 and compared with the initial position. If the present position of thebuoy21 is outside apreprogrammed error range from the initial position the processor 25 activates a transmitter 26 which transmits information identifying the buoy and detailing the positional error via a data link 27 to the central unit 22.
- the processor 25 also instructs a flash control unit 28 to alter the visual signal produced by a flashing light 29 to indicate that the buoy 21 is off station.
- the information transmitted to the central unit 22 is received by a receiver 30 and input to a processor 31.
- the processor 31 displays the information on a display 32 anddisplays awarning that a positional errorhas been detected.
- the buoy equipment is powered by a battery power supply (not shown).
- the invention has been described in relation to a buoy drift warning system but is equally applicable to drift warning systems for all types of watercraft such as ships, yachts etc in harbours, rivers, marinas and so on.
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
A drift warning unit for a buoy or vessel (1) positioned remotely from a central monitoring unit (2) comprises a global positioning system (GPS) receiver (or receiver acting as a relay) (3), positioned on the buoy (1), which receives global positioning information from earth satellites. A presetter (4) enables the desired latitude and longitude co-ordinates of the buoy (1) to be set. The central unit (2) includes a receiver/transmitter (6) for receiving and transmitting data over a data link (5). A processor (7) is programmed to store the positional data relating to the buoy (1) when it is set in its initial position and it activates an interrogator (8) at regular intervals. The interrogator (8) causes an interrogation signal to be sent over the data link (5) to the buoy (1), which is then input to a transponder (9) which activates a transmitter (10) to transmit GPS positional data relating to the buoy (1) back to the central unit (2). The GPS data is received by the receiver (6) and input to the processor (7), which then compares the present position of the buoy (1) with the stored initial position and if the present position is outside a preprogrammed error range the processor displays a warning signal on a display (11). The system uses GPS in what is called the Differential Mode.
Description
BUOY AND WATERCRAFT DRIFT WARNING! SYSTEM
The present invention relates to the monitoring of the positions of buoys, such as navigation buoys, or watercraft that are moored or anchored, for example ships in a harbour or yachts in a marina.
An essential feature of any navigation buoy is that its exact position is known and maintained. At present, buoys must be checked physically at regular intervals to check that they have not drifted. In roughweather it can be impossible to check the buoys and, as that is the time that they are most likely to drift, dangerous situations can develop.
Drifting of moored or anchored watercraft can also cause problans. There are thousands of craft moored or anchored at any one time and the losses caused by drifting of craft are considerable. The checking of craft in harbours, marinas, etc relies on visual checks and it is difficult for comprehensive checks to be carried out regularly.
The object of the invention is to provide a means of automatically checking the position of a buoy or craft and providing a warning if it has drifted.
The invention provides a drift warning system for a remote unit comprising: a) means to determine the position of the remote unit; b) means to store an initial position of the remote object; c) means to compare the present position of the remote unitwith the initial position; and d) means to activate a warning signal if the present position is outside a predetermined error range from the initial position.
The remote unit itself may be a buoy or any type ofwatercraft suchas a ship or a yacht.
Preferably the means to determine the position includes a receiver,
mounted at the remote unit, responsive to global positioning information transmitted by earth satellites.
Advantageously the receiver is responsive to global positioning information from aGlobal Positioning Systemused in theDifferentialMode to detect changes in the position of the remote unit, as this provides greater positional accuracy.
Preferably a central monitoring unit is provided at which a warning signal is activated andwhich can monitor several remote units concurrently.
The receiver may include its own processing capability but advantageously it acts as a relay such that all the information received from satellites is passed via the relay and processed at the central monitoring unit.
Preferably the means to store the initial position and the means to compare the present and initial positions of the remote unit comprise processing means, such as a programmed microprocessor.
Preferably the initial position of the remote unit is entered into the processing means when the remote unit is set in place, moored or anchored as the case may be. Preferably allowable errors from the initial position are programmmed into the processing means.
If the processing means detects an error in the remote station position it triggers a warning signal. The processing means may be at the central monitoring unit or at the remote unit.
If the processing means is at the central unit the central unit preferably includes a transmitter to transmit interrogation signals to the remote unit and a receiver to receivepositional information from the remote unit. The remote unit includes a transponder responsive to the interrogation signals from the central unit and a transmitter to transmit data relating to its position to the central unit, which is activated by the
transponder in response to an interrogation signal from the central unit. The remote station unit canbe interrogatedondemand or by repeated automatic interrogations.
If the processing means is at the remote unit the remote unit preferably includes means to enter the initial position into the processing means when the remote station is set in position or moored etc. The remote unit also includes a transmitter to transmit information to the central unit and advantageously also includes warning signal means at the remote station. If the processing means detects an error in the remote unit position the processing means activates the transmitter to send a signal to the central unit to activate the warning signal. Advantageously the transmitter also transmits data identifying the remote unit and detailing the positional error.
The remote unit processor automatically informs the central unit if there is an error in position. Alternatively the remote unit may also include transponder means responsive to interrogation signals from the central unit which activates the transmitter to transmit positional data to the central unit in response to an interrogation signal. This enables the remote unit positions to be checked on demand or scanned automatically.
If the remote unit is a navigation buoy a warning signal at the buoy can be effected by the processing means causing the visual signalling to be altered, to alert shipping that the buoy is off station.
The warning signal at the central unit may be of any convenient form such as an audio or a visual alarm.
Advantageously display means may be provided at the central unit to display positional data relating to a plurality of remote units.
The invention will now be described, by way of example only, with reference to the drawings of which:
Figure 1 shows a schematic diagram of one form of a buoy drift
warning system according to the invention; and Figure 2 shows a schematic diagramof analternativeformof a buoy drift warning system.
As shown in Figure 1 a buoy is positioned remotely from a central monitoring unit 2. Mounted in the buoy 1 is a global positioning system (GPS) receiver (or receiver acting as a relay) 3 which receives global, positioning information from earth satellites. A presetter 4 enables the desired latitude and longitude co-ordinates of the buoy 1 to be set. Adata link 5 links the buoy 1 with the central unit 2. The central unit2 includes a receiver/transmitter 6 for receiving and transmitting data over the data link 5. Aprocessor 7 isprogrammed to store the positional data relating to the buoy 1 when it is set in its initial position. The processor 7 is prograπmed to activate an interrogator 8 at regular intervals. The interrogator 8 causes an interrogation signal to be sent over the data link 5 to the buoy 1. The interrogation signal is input to a transponder 9 which activates a transmitter 10 to transmit GPS positional data relating to the buoy 1 back to the central unit 2. TheGPS data is received by the receiver 6 and input to the processor 7. The processor 7 then compares the present position of the buoy 1 with the stored initial position and if the present position is outside a preprogrammed error range the processor displays a warning signal on a display 11. The system uses GES in what is called the Differential Mode. The buoy 1 also includes a battery power supply 12.
Figure 2 shows an alternative buoy drift warning system that is particularly suitable for major navigation buoys. A buoy 21 is located remotely from a central monitoring unit 22. The buoy 21 contains a GPS receiver 23 for receiving information from earth satellites. A presetter 24 enables the latitude and longitude co-ordinates of the buoy's initial position to be input to a processor 25. The GPS data received by the receiver 23 is input into the processor 25 and compared with the initial position. If the present position of thebuoy21 is outside apreprogrammed error range from the initial position the processor 25 activates a transmitter 26 which transmits information identifying the buoy and detailing the positional error via a data link 27 to the central unit 22.
The processor 25 also instructs a flash control unit 28 to alter the visual signal produced by a flashing light 29 to indicate that the buoy 21 is off station.
The information transmitted to the central unit 22 is received by a receiver 30 and input to a processor 31. The processor 31 displays the information on a display 32 anddisplays awarning that a positional errorhas been detected.
The buoy equipment is powered by a battery power supply (not shown).
The invention has been described in relation to a buoy drift warning system but is equally applicable to drift warning systems for all types of watercraft such as ships, yachts etc in harbours, rivers, marinas and so on.
It has many advantages including its flexibility and its ability to allow automatic warning to be given of drifting before potentially dangerous situations can develop.
Claims
1. A drift warning system for a remote unit characterised in that it comprises: a) means to determine the position of the remote unit, including a receiver, mounted at the remote unit, responsive to global positioning information transmitted by earth satellites; b) means to store an initial position of the remote object; c) means to compare the present position of the remote unitwith the initial position; and d) means to activate a warning signal if the present position is outside a predetermined error range from the initial position.
2. A drift warning system according to claim 1 characterised in that a central monitoring unit is provided.
3. A drift warning system according to claim 1 or claim 2 characterised in that the receiver is responsive to global positioning information from a Global Positioning System used in the Differential Mode.
4. A drift warning system according to any one preceding claim characterised in that the receiver acts as a relay such that all the information received from satellites is passed via the relay to the central monitoring unit.
5. A drift warning system according to any one preceding claim characterised in that the means to store the initial position and themeans to compare the present and initial positions of the remote unit comprise processing means, such as a programmed microprocessor.
6. A drift warning system according to claim 5 characterised in that the initial position of the remote unit is entered into the processingmeanswhen the remote unit is set in place, moored or anchored.
7. A drift warning system according to claim 6 characterised in that allowable errors from the initial position are programmmed into the processing means.
8. A drift warning system according to any one of claims 5 to 7 characterised in that a warning signal is triggered if the processing means detects an error in the remote station position.
9. A drift warning system according to any one of claims 5 to 8 characterised in that the processing means is at the central monitoring unit.
10. A drift warning system according to any one of claims 5 to 8 characterised in that the processing means is at the remote unit.
11. A drift warning system according to claim 9 characterised in that the central unit includes a transmitter to transmit interrogation signals to the remote unit and a receiver to receive positional information from the remote unit.
12. A drift warning system according to claim 11 characterised in that the remote unit includes a transponder responsive to the interrogation signals from the central unit and a transmitter to transmit data relating to its position to the central unit, which is activated by the transponder in response to an interrogation signal from the central unit.
13. A drift warning system according to claim 12 characterised in that the remote unit includes means to enter the initial position into the processing means when the remote station is set in position or moored etc.
14. Adriftwarning systemaccording toclaim10 or claim13 characterised in that the remote unit includes a transmitter to transmit information to the central unit.
15. Adrift warning system according toclaim14 characterised in that there is included warning signal means at the remote station.
16. Adrift warning systemaccording to claim14 or claim15 characterised in that the processing means activates the transmitter to send a signal to the central unit to activate thewarning signal if the processing means detects an error in the remote unit position.
17. A drift warning system according to claim 18 characterised in that the transmitter also transmits data identifying the remote unit and detailing the positional error.
18. A drift warning system according to any one of claims 14 to 17 characterised in that the remote unit processor automatically informs the central unit if there is an error in position.
19. A drift warning system according to any one of claims 14 to 18 characteriseo in that the the remote unit includes transponder ..means responsive to interrogation signals from the central unit which activates the transmitter to transmit positional data to the central unit in response to an interrogation signal.
20. A drift warning system according to any one prececing claiπt characterised in that the remote unit is a buoy.
21. A drift warning system according to any one of claims 1 to 19 characterised in that the remote unit is a ship or a yacht.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8728167 | 1987-12-02 | ||
| GB878728167A GB8728167D0 (en) | 1987-12-02 | 1987-12-02 | Bouy and watercraft drift warning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1989005460A1 true WO1989005460A1 (en) | 1989-06-15 |
Family
ID=10627856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1988/001066 Ceased WO1989005460A1 (en) | 1987-12-02 | 1988-12-02 | Buoy and watercraft drift warning system |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB8728167D0 (en) |
| WO (1) | WO1989005460A1 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991019997A1 (en) * | 1990-06-14 | 1991-12-26 | Gec-Marconi Limited | Transponder system |
| EP0444738A3 (en) * | 1990-02-28 | 1992-08-26 | Philips Electronics Uk Limited | Vehicle location system |
| EP0512789A3 (en) * | 1991-05-09 | 1993-04-21 | Navsys Corporation | Vehicle tracking system employing global positioning system (gps) satellites |
| GB2270405A (en) * | 1992-09-07 | 1994-03-09 | David John Barron | Tracking device |
| EP0601293A3 (en) * | 1992-12-07 | 1995-08-16 | Motorola Inc | Intelligent radiolocation system. |
| WO1997044683A1 (en) * | 1996-05-23 | 1997-11-27 | Unwire Ab | A method and a system for monitoring plurality of movable objects |
| US6985812B2 (en) * | 2001-04-13 | 2006-01-10 | General Dynamics Advanced Information Systems, Inc. | System and method for detecting interference in global positioning satellite signals |
| US7025254B1 (en) * | 2003-11-05 | 2006-04-11 | Blue Water Concepts, Inc. | Non-visually identifiable fishing gear |
| US7512492B2 (en) * | 2001-04-13 | 2009-03-31 | General Dynamics Advanced Information Systems, Inc. | System and method for detecting interference in global positioning satellite signals |
| ITBO20110273A1 (en) * | 2011-05-16 | 2012-11-17 | Luciano Tinti | DEVICE FOR THE SURVEILLANCE OF THE MOORING POSITION OF A BOAT |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622557A (en) * | 1984-10-31 | 1986-11-11 | The United States Of America As Represented By The Secretary Of The Air Force | Transdigitizer for relaying signals from global positioning system (GPS) satellites |
| US4651157A (en) * | 1985-05-07 | 1987-03-17 | Mets, Inc. | Security monitoring and tracking system |
| EP0242099A2 (en) * | 1986-04-09 | 1987-10-21 | Advanced Strategics, Inc. | Anti-theft and locating system |
-
1987
- 1987-12-02 GB GB878728167A patent/GB8728167D0/en active Pending
-
1988
- 1988-12-02 WO PCT/GB1988/001066 patent/WO1989005460A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622557A (en) * | 1984-10-31 | 1986-11-11 | The United States Of America As Represented By The Secretary Of The Air Force | Transdigitizer for relaying signals from global positioning system (GPS) satellites |
| US4651157A (en) * | 1985-05-07 | 1987-03-17 | Mets, Inc. | Security monitoring and tracking system |
| EP0242099A2 (en) * | 1986-04-09 | 1987-10-21 | Advanced Strategics, Inc. | Anti-theft and locating system |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE35498E (en) * | 1990-02-28 | 1997-04-29 | U.S. Philips Corporation | Vehicle location system |
| EP0444738A3 (en) * | 1990-02-28 | 1992-08-26 | Philips Electronics Uk Limited | Vehicle location system |
| GB2246270A (en) * | 1990-06-14 | 1992-01-22 | Marconi Gec Ltd | Transponder system includes smart cards. |
| GB2246270B (en) * | 1990-06-14 | 1994-05-11 | Marconi Gec Ltd | Transponder system |
| US5341140A (en) * | 1990-06-14 | 1994-08-23 | Gec-Marconi Limited | Transponder system |
| AU653733B2 (en) * | 1990-06-14 | 1994-10-13 | Bae Systems Integrated System Technologies Limited | Transponder system |
| WO1991019997A1 (en) * | 1990-06-14 | 1991-12-26 | Gec-Marconi Limited | Transponder system |
| EP0512789A3 (en) * | 1991-05-09 | 1993-04-21 | Navsys Corporation | Vehicle tracking system employing global positioning system (gps) satellites |
| AU663490B2 (en) * | 1991-05-09 | 1995-10-12 | Navsys Corporation | Vehicle tracking system employing global positioning system (GPS) satellites |
| GB2270405A (en) * | 1992-09-07 | 1994-03-09 | David John Barron | Tracking device |
| EP0601293A3 (en) * | 1992-12-07 | 1995-08-16 | Motorola Inc | Intelligent radiolocation system. |
| WO1997044683A1 (en) * | 1996-05-23 | 1997-11-27 | Unwire Ab | A method and a system for monitoring plurality of movable objects |
| US6366216B1 (en) | 1996-05-23 | 2002-04-02 | Unwire Ab | Method and a system for monitoring plurality of movable objects |
| US6985812B2 (en) * | 2001-04-13 | 2006-01-10 | General Dynamics Advanced Information Systems, Inc. | System and method for detecting interference in global positioning satellite signals |
| US7366611B2 (en) | 2001-04-13 | 2008-04-29 | General Dynamics Advanced Information Systems, Inc. | System and method for detecting interference in global positioning satellite signals |
| US7512492B2 (en) * | 2001-04-13 | 2009-03-31 | General Dynamics Advanced Information Systems, Inc. | System and method for detecting interference in global positioning satellite signals |
| US7025254B1 (en) * | 2003-11-05 | 2006-04-11 | Blue Water Concepts, Inc. | Non-visually identifiable fishing gear |
| ITBO20110273A1 (en) * | 2011-05-16 | 2012-11-17 | Luciano Tinti | DEVICE FOR THE SURVEILLANCE OF THE MOORING POSITION OF A BOAT |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8728167D0 (en) | 1988-01-06 |
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