Location and movement of remote operated vehicles
First Claim
1. An ROV system comprising:
- a topside;
a fish fitted with a GPS receiver;
a position data transmitter operable to transmit GPS position data;
a position data receiver operable to receive GPS position data; and
an umbilical cable for interconnecting the fish and the topside, and having a communication path for relaying the GPS position data between the topside and the fish;
wherein the umbilical cable comprises a connector operable to detachably connect it to the fish, and which can be remotely operated by a detach command sent from the topside which causes the cable to detach from the fish;
and further comprising a tension sensor operable to measure tension in the umbilical cord and to cause a detach command to be sent to the connector if the tension exceeds a predetermined level.
1 Assignment
0 Petitions
Accused Products
Abstract
A remote operated vehicle system comprises a topside, a fish equipped with a GPS receiver, a transmitter for transmitting GPS position data, and a receiver operable to receive the transmitted position data. Transmission may be from the fish to the topside or from the topside to the fish. Alternatively, a second transmitter and receiver give two-way transmission. These arrangements allow the position of the fish to be monitored or tracked, so that it can be readily rescued in the event of damage or breakdown. Alternatively, predetermined position data can be sent to the fish, allowing it to automatically navigate a desired route. Particular embodiments include an umbilical cable for connecting the fish and the topside together and operable to carry signals, including position data, between the two, an additional GPS receiver on the topside so that the fish can navigate to the topside unaided, and a buoyancy control device which brings the fish to the surface.
16 Citations
27 Claims
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1. An ROV system comprising:
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a topside;
a fish fitted with a GPS receiver;
a position data transmitter operable to transmit GPS position data;
a position data receiver operable to receive GPS position data; and
an umbilical cable for interconnecting the fish and the topside, and having a communication path for relaying the GPS position data between the topside and the fish;
wherein the umbilical cable comprises a connector operable to detachably connect it to the fish, and which can be remotely operated by a detach command sent from the topside which causes the cable to detach from the fish;
and further comprising a tension sensor operable to measure tension in the umbilical cord and to cause a detach command to be sent to the connector if the tension exceeds a predetermined level.
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2. An ROV system comprising:
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a topside;
a fish fitted with a GPS receiver;
a position data transmitter operable to transmit GPS position data; and
a position data receiver operable to receive GPS position data;
the position data transmitter and the position data receiver being further operable to relay GPS position data between the topside and the fish; and
wherein the fish further comprises a buoyancy control device operable to automatically surface the fish from a depth of water in response to one or more predetermined conditions. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of navigating a fish associated with an ROV system, comprising:
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providing the fish with an inertial navigation system and a GPS receiver;
propelling the fish underwater from a starting position;
monitoring movement of the fish with the inertial navigation system to calculate its position relative to the starting position;
periodically surfacing the fish and activating the GPS receiver to obtain a measurement of absolute position of the fish;
comparing the measured absolute position and the calculated relative position to determine any error in the calculated relative position; and
correcting the calculated relative position to correspond to the measured absolute position if an error is found.
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23. An ROV system comprising:
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a topside;
a fish fitted with a GPS receiver;
a position data transmitter operable to transmit GPS position data; and
a position data receiver operable to receive GPS position data;
the position data transmitter and the position data receiver being further operable to relay GPS position data between the topside and the fish; and
further comprising an inertial navigation system on the fish operable to monitor movement of the fish and calculate its position relative to a starting position.
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24. A method of recovering a fish associated with an ROV system, comprising:
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surfacing the fish from a depth of water;
activating a GPS receiver on the fish to obtain first GPS position data relating to the absolute position of the fish;
activating a GPS receiver on a topside to obtain second GPS position data relating to the absolute position of the topside;
comparing the first and second GPS position data to determine the relative position of the fish and the topside;
providing third GPS position data relating to the relative position to a movement control device operable to control propulsion of the fish; and
controlling propulsion of the fish in response to the third GPS position data to bring the fish adjacent to the topside. - View Dependent Claims (25, 26)
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27. A method of navigating a fish associated with an ROV system, comprising:
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determining a route along which the fish will navigate;
determining a plurality of GPS position data, each datum corresponding to a location on the route;
providing the GPS position data to a topside of the ROV system;
transmitting the GPS position data from the topside to the fish; and
activating a movement control device on the fish operable to propel the fish from location to location in response to the GPS position data and periodic measurements of actual fish location obtained from a GPS receiver on the fish.
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Specification