Vehicle navigation system using GPS including correction of coefficients for velocity sensor
First Claim
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1. 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 received from outside of the vehicle; and
sensor coefficient calculating means for calculating, only when a travel section of the travel path of the vehicle detected by said linear travel detecting means is linear, a coefficient of said first sensor on the basis of a ratio between (i) a distance between two positions of the vehicle in said linear travel section of the travel path of the vehicle detected by said linear travel detecting means, said two positions being obtained by said means for obtaining positional data of the vehicle, and (ii) a distance of linear travel of the vehicle calculated on the basis of signals outputted by said first sensor during a period between (a) when one of said two positions of the vehicle is obtained by said means for obtaining positional data of the vehicle and (b) when the other of said two positions of the vehicle is obtained by said means for obtaining positional data of the vehicle.
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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.
27 Citations
6 Claims
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1. A vehicle navigation system comprising:
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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 received from outside of the vehicle; and sensor coefficient calculating means for calculating, only when a travel section of the travel path of the vehicle detected by said linear travel detecting means is linear, a coefficient of said first sensor on the basis of a ratio between (i) a distance between two positions of the vehicle in said linear travel section of the travel path of the vehicle detected by said linear travel detecting means, said two positions being obtained by said means for obtaining positional data of the vehicle, and (ii) a distance of linear travel of the vehicle calculated on the basis of signals outputted by said first sensor during a period between (a) when one of said two positions of the vehicle is obtained by said means for obtaining positional data of the vehicle and (b) when the other of said two positions of the vehicle is obtained by said means for obtaining positional data of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsSuga, Yoichiro, Shibata, Akihito, Tsuji, Hiroaki
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Primary Examiner(s)ZANELLI, MICHAEL J
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Application NumberUS07/963,751Time in Patent Office1,176 DaysField of Search364/450, 364/449, 364/457, 364/454, 364/571.01, 364/571.02, 340/988, 342/450, 342/451, 342/357, 342/457US Class Current701/221CPC Class CodesG01C 21/28 with correlation of data fr...
