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US3597598A
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Method and means for transforming the acceleration signals generated by accelerometers in a first coordinate system into acceleration signals in a second coordinate system
Assignee: Boeing North American Inc
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Filing: 1964-12-14
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Granted: 1971-08-03
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Expires: 1984-12-14
Abstract
Abstract A method and means for transforming the acceleration signals generated by orthogonally disposed accelerometers mounted upon an untorqued inertial gyro platform into acceleration signals which are useful in another coordinate system, for example, an earth base latitude and longitude coordinate system.
Inventors
- 👤 Donald F Mcallister
- 👤 Frank M Pelteson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:43
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/10; G01C21/12; G01C21/16; G01C21/183; G01C21/188; G01C21/166; G06; G06G; G06G7/00; G06G7/12; G06G7/22; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1221
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
A method for converting the outputs from three accelerometers, each aligned to one axis of a Cartesian coordinate system fixed to a freely rotating platform into accelerometer outputs in a horizontal earth rotating coordinate system, comprising the steps of: determining the constant direction cosine matrix c which transforms a first space-fixed coordinate system to a second space-fixed coordinate system by computing c from the following matrix equation:
Claim 2
Independent Claim
67 words
A method for converting the outputs from three accelerometers, each aligned to one axis of a Cartesian coordinate system fixed to a freely rotating platform into accelerometer outputs in a horizontal earth rotating coordinate system, comprising the steps of: determining the constant direction cosine matrix c which transforms a first space-fixed coordinate system to a second space-fixed coordinate system by computing c from the following matrix equation:
Claim 3
Dependent Claim
63 words
Apparatus for calculating the fixed direction cosine matrix for converting first coordinate system accelerometer output signals of a freely rotating platform to accelerometer output signals in a second coordinate system comprising in combination: means for releasing said platform to freely rotate from a preferred starting position; means for determining the first coordinate space-fixed accelerometer outputs A''x, A''y and A''z from the following matrix:
Claim 4
Dependent Claim
63 words
Apparatus for calculating the fixed direction cosine matrix for converting first coordinate system accelerometer output signals of a freely rotating platform to accelerometer output signals in a second coordinate system comprising in combination: means for releasing said platform to freely rotate from a preferred starting position; means for determining the first coordinate space-fixed accelerometer outputs A''x, A''y and A''z from the following matrix:
Claim 5
Dependent Claim
67 words
Apparatus for converting the outputs from three accelerometers, each aligned to one axis of a Cartesian coordinate system fixed to a freely rotating platform into accelerometer outputs in a horizontal earth rotating coordinate system, comprising in combination: means for releasing said platform to freely rotate from a preferred starting position; means for determining the constant direction cosine matrix c by calculating c from the following matrix equation:
Claim 6
Dependent Claim
67 words
Apparatus for converting the outputs from three accelerometers, each aligned to one axis of a Cartesian coordinate system fixed to a freely rotating platform into accelerometer outputs in a horizontal earth rotating coordinate system, comprising in combination: means for releasing said platform to freely rotate from a preferred starting position; means for determining the constant direction cosine matrix c by calculating c from the following matrix equation:
Claim 7
Dependent Claim
77 words
Apparatus for converting the output signals from three accelerometers mounted on a freely rotating platform into accelerometer output signals in a space-fixed coordinate system, comprising in combination: means for transforming platform rotating accelerometer input signals in a first coordinate system into acceleration output signals in the second coordinate system, said means for transforming determining the acceleration output signals in the second coordinate system in response to the platform rotating accelerometer output signals in accordance with the relationship:
Claim 8
Dependent Claim
77 words
Apparatus for converting the output signals from three accelerometers mounted on a freely rotating platform into accelerometer output signals in a space-fixed coordinate system, comprising in combination: means for transforming platform rotating accelerometer input signals in a first coordinate system into acceleration output signals in the second coordinate system, said means for transforming determining the acceleration output signals in the second coordinate system in response to the platform rotating accelerometer output signals in accordance with the relationship:
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |