US3784891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiaxes two cycle gimbal error corrector
Assignee: Honeywell Inc
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Filing: 1971-01-25
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Granted: 1974-01-08
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Expires: 1991-01-25
Abstract
Abstract Apparatus for compensating for gimbal error occurring in a directional gyroscopic data transmission system under simultaneous conditions of pitch and roll attitude of the aircraft by the provision of an electrical circuit connected in a three-branch line coupling the gyro transmitter to an electrical receiver at which the output data is produced. The compensating circuit includes a pair of amplifiers connected across one branch of the three-branch line. The signals provided at the outputs of the respective amplifiers are modified in accordance with discrete functions of aircraft pitch and roll attitude, the one amplifier output being connected into the one branch of the line across which the amplifiers are connected while the other amplifier output is coupled into the two additional branches of the line thereby providing the receiver with electrical heading signals compensated for the gimbal error.
Inventors
- 👤 W Burmeister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:18
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/34; G01C19/36
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
222 words
In a gyroscopic data transmission system including a gyroscope having a transmitter connected thereto and a receiver electrically coupled to the transmitter by way of a multicircuit line and wherein the transmitter and receiver have multiple branches each coupled to a respective branch of the multicircuit line, means for compensating the transmitter output signal for errors dependent upon the attitude of the gyroscope and the orientation of its gimbal configuration, said compensating means comprising first and second amplifiers having their inputs connected to one branch of said multicircuit line, said one branch of the multicircuit line being connected to a transmitter branch which is initially aligned with the spin axis of the gyroscope so as to provide zero voltage across a pair of other branches of the multicircuit line, means for modifying the signal provided by said first amplifier in accordance with a first function of the attitude of the gyroscope with respect to a pair of orthogonal axes, means for modifying the signal provided by said second amplifier in accordance with a second function of the attitude of the gyroscope with respect to said orthogonal axes, means for coupling the output of said first amplifier into said one branch of said multicircuit line, and means for coupling the output of said second amplifier into the other branches of said multicircuit line.
Claim 2
Dependent Claim
222 words
In a gyroscopic data transmission system including a gyroscope having a transmitter connected thereto and a receiver electrically coupled to the transmitter by way of a multicircuit line and wherein the transmitter and receiver have multiple branches each coupled to a respective branch of the multicircuit line, means for compensating the transmitter output signal for errors dependent upon the attitude of the gyroscope and the orientation of its gimbal configuration, said compensating means comprising first and second amplifiers having their inputs connected to one branch of said multicircuit line, said one branch of the multicircuit line being connected to a transmitter branch which is initially aligned with the spin axis of the gyroscope so as to provide zero voltage across a pair of other branches of the multicircuit line, means for modifying the signal provided by said first amplifier in accordance with a first function of the attitude of the gyroscope with respect to a pair of orthogonal axes, means for modifying the signal provided by said second amplifier in accordance with a second function of the attitude of the gyroscope with respect to said orthogonal axes, means for coupling the output of said first amplifier into said one branch of said multicircuit line, and means for coupling the output of said second amplifier into the other branches of said multicircuit line.
Claim 3
Dependent Claim
61 words
The apparatus of claim 1 wherein said first amplifier is serially coupled in said one branch and said means for coupling the output of said second amplifier into said other branches includes respective summing amplifiers each conneCted in a discrete branch of said multicircuit line for summing the signal thereon with the signal provided at the output of said second amplifier.
Claim 4
Dependent Claim
90 words
The apparatus of claim 1 wherein said means for coupling the output of said first amplifier into said one branch includes a transformer having a primary winding connected to the output of said first amplifier and a secondary winding serially connected in said one branch, and said means for coupling the output of said second amplifier into said other branches includes respective transformers each having a primary winding connecting to the output of said second amplifier and a secondary winding serially connected in a discrete branch of said other branches.
Claim 5
Dependent Claim
49 words
The apparatus of claim 1 wherein said first and second functions are representable mathematically as 3/2 ((cos phi /cos theta ) -1)) and Square Root 3/2 tan theta sin phi respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
Claim 6
Dependent Claim
46 words
The apparatus of claim 1 wherein said first and second functions are representable mathematically as 3/2 (( theta 2/2) -( phi 2/2)) and ( phi theta ) respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
Claim 7
Dependent Claim
41 words
The apparatus of claim 1 including a resistor network connected in said multicircuit line intermediate the transmitter and receiver wherein the inputs of said first and second amplifiers are connected across the part of said network associated with said one branch.
Claim 8
Dependent Claim
39 words
The apparatus of claim 6 wherein the transmitter and receiver are respective synchros each having a relatively rotatable rotor and a three-branch stator, and said resistor network comprises Y-connected resistors coupled to the corresponding branches of the synchro stators.
Claim 9
Dependent Claim
49 words
The apparatus of claim 7 wherein said first and second functions are representable mathematically as 3/2 ((cos phi /cos theta ) -1)) and Square Root 3/2 tan theta sin phi respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
Claim 10
Dependent Claim
46 words
The apparatus of claim 7 wherein said first and second functions are mathematically representable as 3/2 (( theta 2/2) -( phi 2/2)) and ( phi theta ) respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
Claim 11
Dependent Claim
64 words
The apparatus of claim 7 wherein said first amplifier has its input connected across one branch of said Y-connected resistors and its output coupled to a corresponding branch of said receiver, and the means for coupling the output of said second amplifier into said other branches includes respective summing amplifiers coupled between the corresponding branches of the stators of said transmitter and said receiver.
Claim 12
Dependent Claim
93 words
The apparatus of claim 7 wherein said means for coupling the output of said first amplifier into said one branch includes a transformer having a primary winding connected to the output of said first amplifier and a secondary winding serially connected in said one branch, and the means for coupling the output of said second amplifier into said other branches includes first and second additional transformers each having a primary winding connected to the output of said second amplifier and a secondary winding serially connected in a discrete branch of said other branches.
Claim 13
Dependent Claim
58 words
The apparatus of claim 7 wherein said gyroscope is a directional gyroscope oriented such that in a level condition its spin axis is in the plane of said orthogonal axes and its azimuth axis normal thereto, and further including additional gyroscopic means for providing signals representative of the attitude of said directional gyroscope relative to said orthogonal axes.
Claim 14
Dependent Claim
64 words
The apparatus of claim 12 wherein said first amplifier has its input Connected across one branch of said Y-connected resistors and its output coupled to a corresponding branch of said receiver, and the means for coupling the output of said second amplifier into said other branches includes respective summing amplifiers coupled between the corresponding branches of the stators of said transmitter and said receiver.
Claim 15
Dependent Claim
24 words
The apparatus of claim 13 wherein the signals provided at the outputs of the respective summing amplifiers are phase inverted relative to one another.
Claim 16
Dependent Claim
46 words
The apparatus of claim 22 wherein said first and second functions are representable mathematically as 3/2 (( theta 2/2) -( phi 2/2)) and ( phi theta ) respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
Claim 17
Dependent Claim
49 words
The apparatus of claim 14 wherein said first and second functions are representable mathematically as 3/2 ((cos phi /cos theta ) -1)) and Square Root 3/2 tan theta sin phi respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
Claim 18
Dependent Claim
93 words
The apparatus of claim 12 wherein said means for coupling the output of said first amplifier into said one branch includes a transformer having a primary winding connected to the output of said first amplifier and a secondary winding serially connected in said one branch, and the means for coupling the output of said second amplifier into the other branches includes first and second additional transformers each having a primary winding connected to the output of said second amplifier and a secondary winding serially connected in a discrete branch of said other branches.
Claim 19
Dependent Claim
43 words
The apparatus of claim 17 wherein the first and second additional transformers are connected so that the output signal of said second amplifier is applied to one of said other branches with phase opposite to that in the second of said other branches.
Claim 20
Dependent Claim
49 words
The apparatus of claim 18 wherein said first and second functions are representable mathematically as 3/2 ((cos phi /cos theta ) -1)) and Square Root 3/2 tan theta sin phi respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
Claim 21
Dependent Claim
46 words
The apparatus of claim 18 wherein said first and second functions are representable mathematically as 3/2 (( theta 2/2) -( phi 2/2)) and ( phi theta ) respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
Claim 22
Dependent Claim
46 words
The apparatus of claim 1 wherein said multicircuit line comprises three branches and the signal applied from said second amplifier to one of said other branches is of opposite phase relative to the signal applied from said second amplifier to the second of said other branches.
Claim 23
Dependent Claim
49 words
The apparatus of claim 21 wherein said first and second functions are representable mathematically as 3/2 ((cos phi /cos theta ) -1)) and Square Root 3/2 tan theta sin phi respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
Claim 24
Dependent Claim
46 words
The apparatus of claim 21 wherein said first and second functions are representable mathematically as 3/2 (( theta 2/2) -( phi 2/2)) and ( phi theta ) respectively where theta and phi represent the attitude of the gyroscope relative to respective ones of said orthogonal axes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |