US5539647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle navigation system using GPS including correction of coefficients for velocity sensor
Assignee: Panasonic Holdings Corp
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Filing: 1995-09-19
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Granted: 1996-07-23
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Expires: 2015-09-19
Abstract
Abstract A vehicle navigation system automatically corrects the coefficient of its velocity sensor with high precision. This system obtains a distance between two positions measured by a GPS and a linear travel distance calculated on the basis of the signals outputted by the velocity sensor during a period between the measurement of the two positions. Then, the system corrects the velocity sensor coefficient so that the linear travel distance becomes equal to the distance between the two positions.
Inventors
- 👤 Akihito Shibata
- 👤 Hiroaki Tsuji
- 👤 Yoichiro Suga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:07
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G01C21/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A vehicle navigation system comprising: a first sensor for detecting a velocity of a vehicle; a second sensor for detecting a direction of the vehicle; estimated position calculating means for calculating an estimated position of the vehicle on the basis of outputs of said first and second sensors; linear travel detecting means for detecting linear travel of the vehicle on the basis of a travel path of the vehicle obtained on the basis of a plurality of estimated positions; means for obtaining positional data of the vehicle from an outside of the vehicle; and sensor coefficient calculating means for calculating a coefficient of said first sensor on the basis of a ratio between a distance between two positions of the vehicle obtained from the outside of the vehicle, and a linear travel distance from an estimated position calculating at the time when a first one of said two positions is obtained to another estimated position calculated at the time when a second position is obtained.
Claim 2
Dependent Claim
165 words
A vehicle navigation system comprising: a first sensor for detecting a velocity of a vehicle; a second sensor for detecting a direction of the vehicle; estimated position calculating means for calculating an estimated position of the vehicle on the basis of outputs of said first and second sensors; linear travel detecting means for detecting linear travel of the vehicle on the basis of a travel path of the vehicle obtained on the basis of a plurality of estimated positions; means for obtaining positional data of the vehicle from an outside of the vehicle; and sensor coefficient calculating means for calculating a coefficient of said first sensor on the basis of a ratio between a distance between two positions of the vehicle obtained from the outside of the vehicle, and a linear travel distance from an estimated position calculating at the time when a first one of said two positions is obtained to another estimated position calculated at the time when a second position is obtained.
Claim 3
Dependent Claim
148 words
A vehicle navigation system comprising: a first sensor for detecting a velocity of a vehicle; a second sensor for detecting a direction of the vehicle; estimated position calculating means for calculating an estimated position of the vehicle on the basis of outputs of said first and second sensors; means for obtaining positional data of the vehicle received from outside of the vehicle; and sensor coefficient calculating means for calculating a coefficient of said first sensor on the basis of a ratio between (i) a linear distance between two positions of the vehicle obtained by said means for obtaining positional data of the vehicle, and (ii) a linear distance from (a) a first estimated position calculated at the time when a first one of said two positions is obtained to (b) a second estimated position calculated at the time when a second one of said two positions is obtained.
Claim 4
Dependent Claim
148 words
A vehicle navigation system comprising: a first sensor for detecting a velocity of a vehicle; a second sensor for detecting a direction of the vehicle; estimated position calculating means for calculating an estimated position of the vehicle on the basis of outputs of said first and second sensors; means for obtaining positional data of the vehicle received from outside of the vehicle; and sensor coefficient calculating means for calculating a coefficient of said first sensor on the basis of a ratio between (i) a linear distance between two positions of the vehicle obtained by said means for obtaining positional data of the vehicle, and (ii) a linear distance from (a) a first estimated position calculated at the time when a first one of said two positions is obtained to (b) a second estimated position calculated at the time when a second one of said two positions is obtained.
Claim 5
Dependent Claim
25 words
A vehicle navigation system according to claim 2, wherein said means for obtaining positional data of the vehicle is a GPS (Global Positioning System) receiver.
Claim 6
Dependent Claim
17 words
A vehicle navigation system according to claim 3, wherein said second sensor comprises an angular velocity sensor.
Claim 7
Dependent Claim
16 words
A vehicle navigation system according to claim 3, wherein said second sensor comprises a geomagnetic sensor.
Claim 8
Dependent Claim
17 words
A vehicle navigation system according to claim 2, wherein said second sensor comprises an angular velocity sensor.
Claim 9
Dependent Claim
16 words
A vehicle navigation system according to claim 2, wherein said second sensor comprises a geomagnetic sensor.
Claim 10
Dependent Claim
54 words
A vehicle navigation system according to claim 2, wherein said sensor coefficient calculating means includes means for calculating a new coefficient of said first sensor from a previous coefficient of said first sensor by the following formula: K(n)=K(n-1)×R, where K(n) is the new coefficient K(n-1) is the previous coefficient, and R is said ratio.
Claim 11
Dependent Claim
55 words
A vehicle navigation system according to claim 2, wherein said sensor coefficient calculating means includes means for calculating a new coefficient of said first sensor from a previous coefficient of said first sensor by the following formula: K(n)=K(n-1)×(1-α+αR), where K(n) is the new coefficient, K(n-1) is the previous coefficient, R is said ratio, and 0≦α≦1.
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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) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |