Hybrid navigation system for determining a relative position and direction of a vehicle and method therefor
First Claim
1. A system mounted on a moving object for determining a position and direction of the moving object relative to a destination, comprising:
- (a) first means for receiving a navigation electromagnetic wave, calculating coordinate positions of the moving object on the earth on the basis of the received electromagnetic wave, and deriving a running direction of travel in which the moving object advances with respect to an orientation of the geomagnetic field as a reference direction on the basis of the calculated coordinate positions;
(b) second means for detecting a direction of the moving object with respect to the orientation of the geomagnetic field and an intensity of the geomagnetic field on the moving object;
(c) third means for correcting a detection result of the second means to compensate for an error due to an effect of magnetization of a body of the moving object itself on the basis of the running direction data derived from the first means;
(d) fourth means for detecting a distance by which the moving object has moved; and
(e) fifth means for calculating the relative position and direction of the moving object on the basis of the detection result of the fourth means and corrected detection result of the second means derived from the third means.
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Accused Products
Abstract
A hybrid navigation system for determining a relative position and direction of a vehicle and method therefor. In the hybrid navigation system and method, a magnitization quantity on a vehicle body which affects an output detection result of a geomagnetic sensor is calculated on the basis of a forwarding direction data derived from such as a GPS (Global Positioning System) absolute position calculating circuitry. Furthermore, in order to prevent an erroneous determination of the relative position and direction of the vehicle, the calculation on the relative position and direction of the vehicle on the basis of the detection result of the geomagnetic sensor is halted when the vehicle does not run on a straight road.
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Citations
15 Claims
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1. A system mounted on a moving object for determining a position and direction of the moving object relative to a destination, comprising:
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(a) first means for receiving a navigation electromagnetic wave, calculating coordinate positions of the moving object on the earth on the basis of the received electromagnetic wave, and deriving a running direction of travel in which the moving object advances with respect to an orientation of the geomagnetic field as a reference direction on the basis of the calculated coordinate positions; (b) second means for detecting a direction of the moving object with respect to the orientation of the geomagnetic field and an intensity of the geomagnetic field on the moving object; (c) third means for correcting a detection result of the second means to compensate for an error due to an effect of magnetization of a body of the moving object itself on the basis of the running direction data derived from the first means; (d) fourth means for detecting a distance by which the moving object has moved; and (e) fifth means for calculating the relative position and direction of the moving object on the basis of the detection result of the fourth means and corrected detection result of the second means derived from the third means. - View Dependent Claims (2, 3, 4)
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5. A navigation system installed in a moving object, comprising:
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(a) first means for receiving a navigation electromagnetic wave and calculating coordinate positions of the moving object on the earth on the basis of the received navigation electromagnetic wave; (b) second means for detecting a direction of the moving object with respect to the geomagnetic field and a magnitude of a magnetic field on the moving object with respect to the geomagnetic field; (c) third means for detecting a distance moved by the moving object; (d) fourth means for calculating a magnetization quantity on the moving object using running direction data of the moving object calculated from the plurality of adjacent coordinate position data of the moving object by the first means and using a plurality of magnetic field data derived from the second means; and (e) fifth means for receiving the magnetization quantity data on the moving object derived from the fourth means and for calculating the distance moved by the moving object and a relative running direction of the moving object without influence of the magnetization on the moving object on the detection result of the second means. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for determining a relative position and direction of a vehicle to a destination, comprising the steps of:
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(a) preparing an X,Y orthogonal coordinates on the earth according to an orientation of the geomagnetic field; (b) preparing a forward running direction data with respect to the Y coordinate derived from first means for calculating coordinate positions of the vehicle; (c) preparing a forward running direction data with respect to the Y coordinate derived from second means for detecting an orientation of the vehicle with respect to the geomagnetic field as a reference direction and a magnitude of a magnetic field on the vehicle with respect to the geomagnetic field; (d) deriving a center point coordinate data deviated from an origin of X,Y coordinates due to a magnetization on a vehicle body on the basis of the forward running direction data derived by the first and second means; and (e) deriving a relative position and direction of the vehicle on the basis of the center point coordinate data, forward running direction data derived by the second means, and a vehicle running distance data derived by third means, for detecting a distance which the vehicle has travelled. - View Dependent Claims (13, 14, 15)
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Specification