EP0544403A1
Expired / Lapsed
EP
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Vehicle navigation system
Assignee: Panasonic Holdings Corp
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Filing: 1992-10-22
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Granted: —
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Expires: 2012-10-22
Abstract
Abstract A vehicle navigation system automatically corrects the coefficient of the velocity sensor with a 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
EP
Data Source
google_patents
Last Synchronized
2026-11-06 02:25
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G01C21/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
187 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 the 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 in a linear travel section detected by said linear travel detecting means, said two positions being obtained from the outside of the vehicle, and a distance of linear travel of the vehicle calculated on the basis of signals outputted by said first sensor during a period between when one of said two positions of the vehicle is obtained and when the other position is obtained.
Claim 2
Dependent Claim
25 words
A vehicle navigation system according to Claim 1, wherein said means for obtaining positional data of the vehicle is a GPS (Global Positioning System) receiver.
Claim 3
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 calculated 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 4
Dependent Claim
25 words
A vehicle navigation system according to Claim 3, wherein said means for obtaining positional data of the vehicle is a GPS (Global Positioning System) receiver.
References Cited (Backward Citations)
US4713767A
Cited
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