Patent US3837086A successfully refreshed from Google Patents.
US3837086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compass coupler
Assignee: Bendix Corp
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Filing: 1972-08-31
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Granted: 1974-09-24
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Expires: 1992-08-31
Abstract
Abstract Apparatus for comparing heading angle information provided by a directional gyro with that provided by a magnetic heading device (compass), and providing a bipolar d.c. error signal corresponding to the long time average difference therebetween. The error signal may be used to drive an indicating device or to torque the gyro until the heading error is washed out.
Inventors
- 👤 R James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:44
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/34; G01C19/36
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
Apparatus for coupling a directional gyro which provides a pair of alternating heading angle signals at a first frequency and a magnetic heading device which provides a pair of alternating heading angle signals at a second higher frequency, said apparatus comprising: means connected to the gyro and to the magnetic heading device for multiplying corresponding signals therefrom and for providing first and second signals at the first frequency; means for providing a reference signal at the first frequency; and means connected to the multiplying means and to the reference signal means and responsive to the signals therefrom for providing a constant heading error signal.
Claim 2
Dependent Claim
104 words
Apparatus for coupling a directional gyro which provides a pair of alternating heading angle signals at a first frequency and a magnetic heading device which provides a pair of alternating heading angle signals at a second higher frequency, said apparatus comprising: means connected to the gyro and to the magnetic heading device for multiplying corresponding signals therefrom and for providing first and second signals at the first frequency; means for providing a reference signal at the first frequency; and means connected to the multiplying means and to the reference signal means and responsive to the signals therefrom for providing a constant heading error signal.
Claim 3
Dependent Claim
68 words
Apparatus as described by claim 1, wherein: the gyro and magnetic heading devices each provide signals corresponding to the sine and cosine of the heading angle; and the multiplying means includes a first multiplier for multiplying the gyro and magnetic heading device sine signals for providing the first signal, and a second multiplier for multiplying the gyro and magnetic heading device cosine signals for providing the second signal.
Claim 4
Dependent Claim
103 words
Apparatus as described by claim 2, wherein the means connected to the multiplying means and to the reference signal means and responsive to the signals therefrom for providing a constant heading error signal includes: means connected to the first and second multipliers for summing the first and second signals therefrom for providing a summation signal at the first frequency; another multiplier connected to the summing means and to the reference signal means for multiplying the signals therefrom and for providing a constant level demodulated signal; and filter means connected to said multiplier for filtering the signal therefrom to provide the heading error signal.
Claim 5
Dependent Claim
25 words
Apparatus as described by claim 1, including: means connected to the last mentioned means and responsive to the signal therefrom for indicating the heading error.
Claim 6
Dependent Claim
27 words
Apparatus as described by claim 1, including: the gyro connected to the last mentioned means and torqued by the signal therefrom to wash out the heading error.
Claim 7
Dependent Claim
56 words
Apparatus as described by claim 3, including: a first capacitor connected intermediate the first multiplier and the summing means for removing d.c. signal components and multiplier offsets from the first signal; and a second capacitor connected intermediate the second multiplier and the summing means for removing d.c. signal components and multiplier offsets from the second signal.
Claim 8
Dependent Claim
150 words
Apparatus including heading angle sensing devices and means for coupling said devices, comprising: a directional gyro for providing alternating signals corresponding to the sine and cosine of the heading angle sensed thereby, said signals being at a first frequency; a magnetic heading device for providing alternating signals corresponding to the sine and cosine of the heading angle sensed thereby, said signals being at a second higher frequency; first means connected to the gyro and to the magnetic heading device for multiplying the sine signals therefrom; second means connected to the gyro and to the magnetic heading device for multiplying the cosine signals therefrom; means for summing the signals from the first and second multipliers and for providing a summation signal at the second frequency; and means connected to the multiplying means and to the reference signal means and responsive to the signals therefrom for providing a constant level error signal.
Claim 9
Dependent Claim
150 words
Apparatus including heading angle sensing devices and means for coupling said devices, comprising: a directional gyro for providing alternating signals corresponding to the sine and cosine of the heading angle sensed thereby, said signals being at a first frequency; a magnetic heading device for providing alternating signals corresponding to the sine and cosine of the heading angle sensed thereby, said signals being at a second higher frequency; first means connected to the gyro and to the magnetic heading device for multiplying the sine signals therefrom; second means connected to the gyro and to the magnetic heading device for multiplying the cosine signals therefrom; means for summing the signals from the first and second multipliers and for providing a summation signal at the second frequency; and means connected to the multiplying means and to the reference signal means and responsive to the signals therefrom for providing a constant level error signal.
Claim 10
Dependent Claim
21 words
Apparatus as described by claim 7, including: utilizing means connected to the heading error signal means for utilizing tHe signal therefrom.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |