Angular velocity calculating apparatus for navigation apparatus
First Claim
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1. A navigation apparatus for a mobile vehicle, comprising:
- plural velocity detectors each for detecting a velocity of the moving vehicle;
processing means for deriving a value of a parameter determining an angular velocity of said moving vehicle;
angular velocity calculating means for calculating the velocity of said moving vehicle based on the value of said parameter from said processing means;
velocity calculating means for calculating a mean velocity of said moving vehicle from outputs of said plural velocity detectors;
digital storage means for storing digital map data;
display means for displaying a map and a position of said vehicle on said map; and
a central processing unit for calculating a position of a vehicle based on said angular velocity determined by said angular velocity calculating means and said mean velocity determined by said velocity calculating means, for reading digital map data from said digital storage means, and for generating an output signal to said display means so that said display means displays said map and said position of said vehicle on said map.
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Abstract
An angular velocity calculating apparatus which is low-priced and capable of obtaining an angular velocity with high accuracy is realized. Two velocity detectors which are substantially small in offset error, noise, or the like, unlike the conventionally employed gyroscope, is disposed at portions on the moving matter or in the vicinity thereof, and the angular velocity is obtained on the basis of the velocity information obtained from these detectors. Accordingly, the angular velocity calculating apparatus and a navigation apparatus can be realized which is higher in accuracy and cheaper as compared with the conventional ones.
16 Citations
12 Claims
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1. A navigation apparatus for a mobile vehicle, comprising:
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plural velocity detectors each for detecting a velocity of the moving vehicle; processing means for deriving a value of a parameter determining an angular velocity of said moving vehicle; angular velocity calculating means for calculating the velocity of said moving vehicle based on the value of said parameter from said processing means; velocity calculating means for calculating a mean velocity of said moving vehicle from outputs of said plural velocity detectors; digital storage means for storing digital map data; display means for displaying a map and a position of said vehicle on said map; and a central processing unit for calculating a position of a vehicle based on said angular velocity determined by said angular velocity calculating means and said mean velocity determined by said velocity calculating means, for reading digital map data from said digital storage means, and for generating an output signal to said display means so that said display means displays said map and said position of said vehicle on said map. - View Dependent Claims (2, 3, 4)
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5. An angular velocity calculating method, comprising the steps of:
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detecting plural velocities of a moving matter at plural positions on said moving matter, respectively; deriving a value of a parameter which determines an angular velocity of the moving matter; and calculating an angular velocity of the moving matter based on the value of the parameter, wherein said deriving step comprises the steps of; deriving a first value for the radius; calculating an angle of movement of the moving matter; calculating a distance of a projection between the plural velocity detectors; calculating a second value of said radius; and comparing a value of said first value of said radius with the second value of said radius. - View Dependent Claims (6, 7, 8, 9)
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10. A navigation apparatus, comprising:
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first and second velocity detectors mounted on a vehicle for acquiring first and second velocities of said vehicle; a velocity calculating unit for determining a mean velocity of the vehicle based on the first and second velocities; a processing unit for deriving a radius of movement of the vehicle based on the first and second velocities; an angular velocity calculating unit for determining the angular velocity of the vehicle based on the radius of movement derived by the processing unit; a central processing unit for obtaining a current position of the vehicle based on the mean velocity of the vehicle and the angular velocity of the vehicle; a storage device for storing map information; and a display; wherein said central processing unit reads map information from the storage device and provides data to the display so that the display indicates the current position of the vehicle superimposed on the map information. - View Dependent Claims (11, 12)
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Specification