US3825911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote reading compass system
Assignee: Electro Marine Corp
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Filing: 1972-12-07
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Granted: 1974-07-23
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Expires: 1992-12-07
Abstract
Abstract A magnetic compass system having an inductor element which is responsive to the magnetic field generated by a magnet system attached to a compass card, or directly from the earth''s natural magnetic field, the inductor element having alternating current supplied thereto and having polyphase output connected to a servo loop having usual mechanical shafting, which is connected to a dial read-out. Within the servo loop a synchro differential may be placed to correct the indicated reading of the compass for magnetic variation and an encoder may be connected to the mechanical shaft of the servo loop to convert the rotary motion into logic signals such as binary coded signals, which then can be followed by a storage latching circuit and a decoder driver so that the output can be read on standard digital display units. Also by adding a 400 Hz or a 60 Hz synchro transmitter to the servo loop output shaft, the information available from the magnetic compass system, which is suitably corrected for variation, is available to the gyro distribution system and may therefore supply heading information to radar and other gyro repeater devices in the event of main gyro failure.
Inventors
- 👤 H Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:47
CPC Classifications
G; G01; G01C; G01C17/00; G01C17/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
234 words
A nAvigation system comprising a magnetic field, an inductor having an output responsive to said magnetic field a synchro control transformer having a stator, a differential synchro coupled between the inductor and the stator of the synchro control transformer, a graduated dial, a digital display, a decoder driver feeding the digital display, an encoder, a servo amplifier electrically coupled to the rotor of the synchro control transformer, a servo motor having an output shaft electrically coupled to the servo amplifier, a data output shaft, said encoder and graduated dial coupled to the data shaft, a bistable latch, a pulse clock, said pulse clock coupled to said latch, said latch having its input coupled to said encoder and its output to said decoder driver repetitiously sampling information for a short period and retaining the information until the next sampling, said synchro control transformer rotor and said servo motor shaft mechanically coupled to the data output shaft to complete a closed loop servo system, whereby relative movement between the inductor and the magnetic field will cause rotation of said servo motor shaft in proportion to the relative movement of the magnetic field and the inductor and said digital display and graduated dial will simultaneously indicate the angular position of the magnetic field relative to the inductor plus or minus any correction introduced by the synchro differential to reproduce true bearing in accordance with set-in magnetic variation.
Claim 2
Dependent Claim
234 words
A nAvigation system comprising a magnetic field, an inductor having an output responsive to said magnetic field a synchro control transformer having a stator, a differential synchro coupled between the inductor and the stator of the synchro control transformer, a graduated dial, a digital display, a decoder driver feeding the digital display, an encoder, a servo amplifier electrically coupled to the rotor of the synchro control transformer, a servo motor having an output shaft electrically coupled to the servo amplifier, a data output shaft, said encoder and graduated dial coupled to the data shaft, a bistable latch, a pulse clock, said pulse clock coupled to said latch, said latch having its input coupled to said encoder and its output to said decoder driver repetitiously sampling information for a short period and retaining the information until the next sampling, said synchro control transformer rotor and said servo motor shaft mechanically coupled to the data output shaft to complete a closed loop servo system, whereby relative movement between the inductor and the magnetic field will cause rotation of said servo motor shaft in proportion to the relative movement of the magnetic field and the inductor and said digital display and graduated dial will simultaneously indicate the angular position of the magnetic field relative to the inductor plus or minus any correction introduced by the synchro differential to reproduce true bearing in accordance with set-in magnetic variation.
Claim 3
Dependent Claim
40 words
A navigation system as in claim 1 wherein the inductor is a polyphase element, an a.c. current course, said a.c. current source coupled to said polyphase inductor, said synchro control transformer having a polyphase stator connected to said polyphase inductor.
Claim 4
Dependent Claim
44 words
A navigation system as in claim 1 wherein a synchro transmitter is connected to said data shaft and energized with a.c. gyro reference voltage, said transmitter being coupled to a gyro distribution system whereby gyro repeaters may indicate the information of said navigation system.
Claim 5
Dependent Claim
66 words
A navigation system as in claim 1 including a gyro system having a gyro distribution amplifier wherein a synchro polyphase transmitter has its rotor mechanically coupled to the data shaft and electrically coupled to gyro reference voltage, a transfer switch, the polyphase stator of said transmitter is connected to said gyro distribution amplifier through the transfer switch whereby heading information is fed to said gyro system.
Claim 6
Dependent Claim
67 words
A navigation system as in claim 1 including a gyro repeater and a transfer switch, said repeater being coupled through the transfer switch to the synchro polyphase stator, the rotor of which is mechanically coupled to the data shaft, means combining the electrical output of the rotor and a gyro reference voltage and means to supply the output signal of said combining means to the servo motor.
Claim 7
Dependent Claim
36 words
A navigation system as in claim 1 wherein the magnetic field is produced from a compass bowl having a compass card with magnets attached to said card and said inductor is mounted on said compass bowl.
References Cited (Backward Citations)
US3537086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |