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 Title: |
US3947741:
Boat guidance system
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Ball, Kenneth H.; Tarzana, CA
Cole, Jr., Arthur L.; Saugus, CA
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| Assignee: |
Walt Disney Productions, Burbank, CA
other patents from WALT DISNEY PRODUCTIONS (617670) (approx. 22)
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| Published / Filed: |
1976-03-30
/ 1974-01-15
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| Application Number: |
US1974000433505
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| IPC Code: |
Advanced:
G01S 1/02;
G01S 19/19;
G05D 1/02;
IPC-7:
B63H 25/02;
B64C 13/18;
G05D 1/00;
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| ECLA Code: |
G05D1/02C; G01S1/02; L63H11/00M;
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| U.S. Class: |
Current:
318/588;
318/016;
318/576;
318/587;
Original:
318/588;
318/016;
318/576;
318/587;
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| Field of Search: |
318/016,587,576,588,608
180/098
235/150.26,150.27
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| Priority Number: |
| 1974-01-15 |
US1974000433505 |
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| Abstract: |
A guidance system for controlling the path of a boat comprising a first conductor disposed below the surface of water in a first elongated loop and connecting at the terminals thereof across an A.C. source of electrical signal and a second conductor driven in a quadrature with the first conductor and disposed in a second loop partly superposed over the first loop. A first and second orthogonal inductive coil, mounted in the boat along a plane parallel to the loop and a plane normal to the loop plane and substantially parallel to the centerline thereof sense the vertical and horizontal components of the electromagnetic field generated about the conductor loops to produce corresponding induced signals respectively varying in amplitude and phase according to the amplitude of the electromagnetic field and the position thereof. Such induced signal of the first and second coils are then clipped by signal limiters and connected to a common phase detector to produce a phase angle signal indicative of the amplitude of deviation of the coils relative the loops. The phase detector output signal is then connected to control a steering apparatus.
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| Attorney, Agent or Firm: |
Fulwider, Patton, Rieber, Lee & Utecht ;
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| Primary / Asst. Examiners: |
Schaefer, Robert K.; Feldhaus, John J.
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| Family: |
None
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First Claim:
Show all 10 claims |
We claim:
1. A guidance system for controlling the lateral motion of a mobile object along a directed path, comprising:
- a source of A.C. electrical power;
- first signal producing means operatively connected across said source of A.C. power, including a first conductor arranged in circuit to form a first elongated loop in a plane parallel with the surface of the path, for producing a first electromagnetic field signal thereabout according to the excitation thereof by said source of A.C. power;
- phase lag means operatively connected at one end thereof across the said source of A.C. power for producing an A.C. excitation signal at the other end thereof at a predetermined phase relationship with said source of A.C. power;
- second signal producing means operatively connected across said phase lag means, including a second conductor arranged in circuit to form a second elongated loop disposed in substantial parallel arrangement and partly overlapping said first elongated loop, for producing a second electromagnetic field thereabout according to the excitation of said phase lag means;
- first inductive sensor means mounted in said mobile object for producing a first sensor signal indicative of the sum of vector components of said first and second electromagnetic field signals aligned substantially vertical relative the plane of said first and second elongated loops;
- second inductive sensor means mounted in said object for producing a second sensor signal indicative of the sum of the vector components of said first and second electromagnetic field signals aligned substantially parallel to the planes of said loops and substantially transverse to the longitudinal axes thereof;
- a first and second clipping means connected to respectively receive said first and second sensor signals for producing corresponding first and second square wave signals of fixed amplitudes respectively indicative of the zero crossings of said first and second sensor signals;
- phase detector means adapted to receive said first and second square wave signals for producing a control signal indicative of the phase difference therebetween; and
- control means rendered responsive to said control signal for producing control forces directing the motion of said mobile object in response thereto.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 5 U.S. patent(s) that reference this one
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