US4751783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azimuth determination apparatus
Assignee: Denso Corp
•
Filing: 1987-06-03
•
Granted: 1988-06-21
•
Expires: 2007-06-03
Abstract
Abstract Disclosed is an azimuth determination apparatus attached to a motor vehicle for determinating the forward direction of the vehicle. The azimuth determination apparatus includes an azimuth sensor for generating orthogonal first and second signals indicative of the forward direction of the vehicle. Two azimuth vectors are obtained on the basis of the orthogonal first and second component signals, first components of the two azimuth vectors being maximum and minimum. The determination is made in terms of the fact that the difference between second components of the two azimuth vectors is below a predetermined value. In accordance with the determination, the orthogonal first and second component signals are corrected on the basis of said two azimuth vectors so that the accurate moving direction of the motor vehicle can be obtained irrespective of the remanence of the vehicle.
Inventors
- 👤 Katsuhiro Ina
- 👤 Yuji Hirabayashi
- 👤 Susumu Akiyama
- 👤 Kazushi Akutsu
- 👤 Kiyohumi Kage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:05
CPC Classifications
G; G01; G01C; G01C17/00; G01C17/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
An azimuth determination apparatus attached to a moving body, comprising: means for generating orthogonal first and second component signals in response to earth magnetism; means responsive to said orthogonal first and second component signals for computing the forward direction of said moving body; means for detecting two of azimuth vectors obtained on the basis of said orthogonal first and second component signals, first components of said two azimuth vectors being maximum and minimum; means for determining that the difference between second components of said two azimuth vectors is below a predetermined value; and means for correcting said orthogonal first and second component signals on the basis of said two azimuth vecotrs in accordance with a result of the determination.
Claim 2
Dependent Claim
119 words
An azimuth determination apparatus attached to a moving body, comprising: means for generating orthogonal first and second component signals in response to earth magnetism; means responsive to said orthogonal first and second component signals for computing the forward direction of said moving body; means for detecting two of azimuth vectors obtained on the basis of said orthogonal first and second component signals, first components of said two azimuth vectors being maximum and minimum; means for determining that the difference between second components of said two azimuth vectors is below a predetermined value; and means for correcting said orthogonal first and second component signals on the basis of said two azimuth vecotrs in accordance with a result of the determination.
Claim 3
Dependent Claim
196 words
An azimuth determination apparatus attached to a moving body, comprising: means for generating orthogonal X and Y component signals in response to earth magnetism; means responsive to said orthogonal X and Y component signals for computing the forward direction of said moving body; means for detecting first pair vectors and second pair vectors of azimuth vectors obtained on the basis of said orthogonal X and Y component signals, one of said first pair having a maximum X component and the other of said first pair having a minimum X component, one of said second pair having a maximum Y component and the other of said second pair having a minimum Y component; means for determining that the difference between the Y components of said first two vectors is below a first predetermined value and the difference between the X components of said second two vectors is below a second predetermined value; and means for in response to the determination obtaining a X component error on the basis of said first two vectors and obtaining a Y component error on the basis of said second two vectors and for correcting said orthogonal X and Y component signals.
Claim 4
Dependent Claim
196 words
An azimuth determination apparatus attached to a moving body, comprising: means for generating orthogonal X and Y component signals in response to earth magnetism; means responsive to said orthogonal X and Y component signals for computing the forward direction of said moving body; means for detecting first pair vectors and second pair vectors of azimuth vectors obtained on the basis of said orthogonal X and Y component signals, one of said first pair having a maximum X component and the other of said first pair having a minimum X component, one of said second pair having a maximum Y component and the other of said second pair having a minimum Y component; means for determining that the difference between the Y components of said first two vectors is below a first predetermined value and the difference between the X components of said second two vectors is below a second predetermined value; and means for in response to the determination obtaining a X component error on the basis of said first two vectors and obtaining a Y component error on the basis of said second two vectors and for correcting said orthogonal X and Y component signals.
References Cited (Backward Citations)
JPS5728208A
Cited
US4413424A
Cited
US4416067A
Cited
JPS5824811A
Cited
US4497034A
Cited
JPS59100812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |