US5434574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for detecting an altitude of a vehicle dependent on a global positioning system
Assignee: Pioneer Corp
•
Filing: 1994-01-03
•
Granted: 1995-07-18
•
Expires: 2014-01-03
Abstract
Abstract It is determined that an altitude of a vehicle can not be calculated from data applied from satellites. When the calculation can not be performed, a provisional altitude is obtained with a following equation: H=(1-α)H.sub.G +αH.sub.O where H G is an altitude obtained by the GPS, H O is a reference altitude obtained by the outside means, α (O<α<1) is a predetermined smoothing coefficient.
Inventors
- 👤 Katsuyoshi Hayashi
- 👤 Isao Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:37
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G01C21/28; G01C5/00; G01C5/005; G01S; G01S19/00; G01S19/38; G01S19/39; G01S19/42; G01S19/45; G01S19/47
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A system for detecting an altitude of a vehicle dependent on a global positioning system (GPS) comprising: determining means for determining that the altitude can not be calculated from data applied from satellites and for producing a provisional calculation demand; calculating means responsive to the provisional calculation demand for calculating a provisional altitude by correcting a GPS altitude obtained by the GPS at a last time and a reference altitude obtained by an altitude determining means with a smoothing coefficient.
Claim 2
Independent Claim
80 words
A system for detecting an altitude of a vehicle dependent on a global positioning system (GPS) comprising: determining means for determining that the altitude can not be calculated from data applied from satellites and for producing a provisional calculation demand; calculating means responsive to the provisional calculation demand for calculating a provisional altitude by correcting a GPS altitude obtained by the GPS at a last time and a reference altitude obtained by an altitude determining means with a smoothing coefficient.
Claim 3
Dependent Claim
18 words
The system according to claim 1 wherein: said altitude determining means is a memory storing reference altitude data.
Claim 4
Dependent Claim
46 words
The system according to claim 1 wherein: said calculation is performed with a following equation: H=(1-α) H.sub.G +αH.sub.O where H G is an altitude obtained by the GPS, H O is a reference altitude obtained by another device, and α (0<α<1) is a predetermined smoothing coefficient.
Claim 5
Independent Claim
86 words
A system for detecting an altitude of a vehicle dependent on a global positioning system (GPS) comprising: determining means for determining that the altitude can not be calculated from data applied from satellites and for producing a provisional calculation demand; and calculating means responsive to the provisional calculation demand for calculating a provisional altitude by adding a difference between a first reference altitude obtained at a last time and a second reference altitude obtained at a time before the last time to the first reference altitude.
Claim 6
Independent Claim
86 words
A system for detecting an altitude of a vehicle dependent on a global positioning system (GPS) comprising: determining means for determining that the altitude can not be calculated from data applied from satellites and for producing a provisional calculation demand; and calculating means responsive to the provisional calculation demand for calculating a provisional altitude by adding a difference between a first reference altitude obtained at a last time and a second reference altitude obtained at a time before the last time to the first reference altitude.
References Cited (Backward Citations)
US5072227A
Cited
DE4123097A1
Cited
US5265025A
Cited
US5185610A
Cited
US5030957A
Cited
GB2256987A
Cited
US5170171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-17 | 1999-01-16 | 1999-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-17 | 2003-01-16 | 2003-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-17 | 2007-01-16 | 2007-07-18 | $7700.00 | Window Closed / Lapsed |