US5270959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bias correction apparatus of gyro
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1991-12-27
•
Granted: 1993-12-14
•
Expires: 2011-12-27
Abstract
Abstract A bias correction apparatus comprising a gyro, bias calculation means for reading output data of the gyro every a certain fixed period after the apparatus is turned on and for calculating a bias value of the gyro on the basis of the read output data, storage means for storing the bias value calculated by the bias calculation means, and bias correction means for correcting angular velocity data of a vehicle obtained from the gyro output data with the bias value stored in the storage means. When calculating a first bias value after the apparatus is turned on, the bias calculation means calculates the bias value by reading the gyro output data every a shorter period than the certain fixed period.
Inventors
- 👤 Shin-ichi Matsuzaki
- 👤 Kenji Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:54
CPC Classifications
G; G01; G01C; G01C25/00; G01C25/005; G01C21/00; G01C21/26; G01C21/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A bias correction apparatus comprising: a gyro; bias calculation means for reading output data of said gyro every a certain fixed period after the apparatus is turned on and for calculating a bias value of said gyro on the basis of the read output data; storage means for storing said bias value calculated by said bias calculation means; and bias correction means for correcting angular velocity data of a vehicle obtained from the gyro output data with said bias value stored in said storage means, when calculating a first bias value after the apparatus is turned on, said bias calculation means calculating said first bias value by reading said gyro output data every a shorter period than said certain fixed period.
Claim 2
Dependent Claim
121 words
A bias correction apparatus comprising: a gyro; bias calculation means for reading output data of said gyro every a certain fixed period after the apparatus is turned on and for calculating a bias value of said gyro on the basis of the read output data; storage means for storing said bias value calculated by said bias calculation means; and bias correction means for correcting angular velocity data of a vehicle obtained from the gyro output data with said bias value stored in said storage means, when calculating a first bias value after the apparatus is turned on, said bias calculation means calculating said first bias value by reading said gyro output data every a shorter period than said certain fixed period.
Claim 3
Dependent Claim
128 words
A bias correction apparatus comprising: a gyro; bias calculation means for reading output data of said gyro every a certain fixed period after the apparatus is turned on and for calculating a bias value of said gyro on the basis of the read output data; storage means for storing said bias value calculated by said bias calculation means; and bias correction means for correcting heading data, which are obtained by integrating angular velocity data of a vehicle obtained from the gyro output data, with said bias value stored in said storage means, when calculating a first bias value after the apparatus is turned on, said bias calculation means calculating said first bias value by reading said gyro output data every a shorter period than said certain fixed period.
Claim 4
Dependent Claim
128 words
A bias correction apparatus comprising: a gyro; bias calculation means for reading output data of said gyro every a certain fixed period after the apparatus is turned on and for calculating a bias value of said gyro on the basis of the read output data; storage means for storing said bias value calculated by said bias calculation means; and bias correction means for correcting heading data, which are obtained by integrating angular velocity data of a vehicle obtained from the gyro output data, with said bias value stored in said storage means, when calculating a first bias value after the apparatus is turned on, said bias calculation means calculating said first bias value by reading said gyro output data every a shorter period than said certain fixed period.
References Cited (Backward Citations)
US3622764A
Cited
US4193039A
Cited
US4470124A
Cited
US4524357A
Cited
DE3346434A1
Cited
EP0366249A2
Cited
US5065612A
Cited
US5115238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-13 | 1997-06-14 | 1997-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-13 | 2001-06-14 | 2001-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-13 | 2005-06-14 | 2005-12-14 | $7700.00 | Window Closed / Lapsed |