Current position sensing system, map display system and current position sensing method
First Claim
1. A current position sensing system for sensing a current position of a movable entity, comprising:
- a current position sensing means for sensing an approximate current position of the movable entity;
a map information storing means for storing map information that includes information of a target, with which position information that indicates a latitude and a longitude of the target is associated;
a relative position sensing means for sensing a relative position of a measurement subject with respect to the movable entity;
a target extracting means for extracting the information of the target from the map information when the target is located within a predetermined sensing range where the measurement subject is sensible by the relative position sensing means at a time of operating the relative position sensing means at the current position sensed by the current position sensing means;
an obtaining means for obtaining the relative position of the measurement subject, which is sensed by the relative position sensing means when the information of the target is extracted by the target extracting means;
an estimating means for estimating an absolute position of the measurement subject based on the current position of the movable entity, which is sensed by the current position sensing means, and the relative position of the measurement subject, which is obtained by the obtaining means;
a recognizing means for recognizing the measurement subject, which is sensed by the relative position sensing means, as the target, which is extracted by the target extracting means, when a distance between the measurement subject, the absolute position of which is estimated by the estimating means, and the target, which is extracted by the target extracting means, is less than a predetermined threshold value; and
a correcting means for correcting the current position of the movable entity, which is sensed by the current position sensing means, to an absolute position of the movable entity, wherein the absolute position of the movable entity is computed based on the position information of the target, which is recognized by the recognizing means, and the relative position of the target, which is obtained by the obtaining means.
1 Assignment
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Accused Products
Abstract
When information of a target, with which position information is associated, is extracted from map information, a relative position of a measurement subject, which is sensed by a radar, is obtained. Next, an absolute position of the measurement subject is estimated based on a current position of a vehicle, which is sensed through a GPS receiver, and a relative position of the measurement subject. When a distance between the measurement subject and the target is less than a predetermined threshold value, the measurement subject, which is sensed by the radar, is recognized as the target. An absolute position of the vehicle is computed based on the position information of the target and the relative position of the target. The position of the vehicle, which is sensed by the GPS receiver, is corrected to the computed absolute position.
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Citations
7 Claims
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1. A current position sensing system for sensing a current position of a movable entity, comprising:
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a current position sensing means for sensing an approximate current position of the movable entity; a map information storing means for storing map information that includes information of a target, with which position information that indicates a latitude and a longitude of the target is associated; a relative position sensing means for sensing a relative position of a measurement subject with respect to the movable entity; a target extracting means for extracting the information of the target from the map information when the target is located within a predetermined sensing range where the measurement subject is sensible by the relative position sensing means at a time of operating the relative position sensing means at the current position sensed by the current position sensing means; an obtaining means for obtaining the relative position of the measurement subject, which is sensed by the relative position sensing means when the information of the target is extracted by the target extracting means; an estimating means for estimating an absolute position of the measurement subject based on the current position of the movable entity, which is sensed by the current position sensing means, and the relative position of the measurement subject, which is obtained by the obtaining means; a recognizing means for recognizing the measurement subject, which is sensed by the relative position sensing means, as the target, which is extracted by the target extracting means, when a distance between the measurement subject, the absolute position of which is estimated by the estimating means, and the target, which is extracted by the target extracting means, is less than a predetermined threshold value; and a correcting means for correcting the current position of the movable entity, which is sensed by the current position sensing means, to an absolute position of the movable entity, wherein the absolute position of the movable entity is computed based on the position information of the target, which is recognized by the recognizing means, and the relative position of the target, which is obtained by the obtaining means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A current position sensing method for sensing a current position of a movable entity upon execution of the current position sensing method in a current position sensing system, which includes:
- a current position sensing means for sensing an approximate current position of the movable entity;
a map information storing means for storing map information that includes information of a target, with which position information that indicates a latitude and a longitude of the target is associated; and
a relative position sensing means for sensing a relative position of a measurement subject with respect to the movable entity, the current position sensing method comprising;extracting the information of the target from the map information when the target is located within a predetermined sensing range where the measurement subject is sensible by the relative position sensing means at a time of operating the relative position sensing means at the current position sensed by the current position sensing means; obtaining the relative position of the measurement subject, which is sensed by the relative position sensing means when the information of the target is extracted through the extracting of the information of the target; estimating an absolute position of the measurement subject based on the current position of the movable entity, which is sensed by the current position sensing means, and the relative position of the measurement subject, which is obtained through the obtaining of the relative position of the measurement subject; recognizing the measurement subject, which is sensed by the relative position sensing means, as the target, which is extracted through the extracting of the information of the target, when a distance between the measurement subject, the absolute position of which is estimated through the estimating of the absolute position of the measurement subject, and the target, which is extracted through the extracting of the information of the target, is less than a predetermined threshold value; and correcting the current position of the movable entity, which is sensed by the current position sensing means, to an absolute position of the movable entity, wherein the absolute position of the movable entity is computed based on the position information of the target, which is recognized through the recognizing of the measurement subject, and the relative position of the target, which is obtained through the obtaining of the relative position of the measurement subject.
- a current position sensing means for sensing an approximate current position of the movable entity;
Specification