NAVIGATION SYSTEM
First Claim
1. A navigation system comprising:
- an angular velocity sensor for detecting a change in an advancement direction of a vehicle;
a vehicle azimuth calculation unit for calculating a vehicle azimuth on the basis of angular velocity sensor information obtained from said angular velocity sensor;
an on-board camera for shooting a periphery of said vehicle;
an image recognition unit for recognizing an image obtained from said on-board camera; and
an offset voltage correction unit for performing a drift correction on said angular velocity sensor in accordance with an angle error between said vehicle azimuth calculated by said vehicle azimuth calculation unit and a vehicle azimuth determined from a white line on a road recognized by said image recognition unit.
1 Assignment
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Accused Products
Abstract
A navigation system includes: an angular velocity sensor 1 for detecting a change in an advancement direction of a vehicle; a vehicle azimuth calculation unit 13 for calculating a vehicle azimuth on the basis of angular velocity sensor information obtained from the angular velocity sensor; an on-board camera 2 for shooting a periphery of the vehicle; an image recognition unit 19 for recognizing an image obtained from the on-board camera; and an offset voltage correction unit 21 for performing a drift correction on the angular velocity sensor in accordance with an angle error between the vehicle azimuth calculated by the vehicle azimuth calculation unit and a vehicle azimuth determined from a white line on a road recognized by the image recognition unit.
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Citations
12 Claims
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1. A navigation system comprising:
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an angular velocity sensor for detecting a change in an advancement direction of a vehicle; a vehicle azimuth calculation unit for calculating a vehicle azimuth on the basis of angular velocity sensor information obtained from said angular velocity sensor; an on-board camera for shooting a periphery of said vehicle; an image recognition unit for recognizing an image obtained from said on-board camera; and an offset voltage correction unit for performing a drift correction on said angular velocity sensor in accordance with an angle error between said vehicle azimuth calculated by said vehicle azimuth calculation unit and a vehicle azimuth determined from a white line on a road recognized by said image recognition unit. - View Dependent Claims (10, 11, 12)
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2. A navigation system comprising:
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an angular velocity sensor for detecting a change in an advancement direction of a vehicle; a vehicle azimuth calculation unit for calculating a vehicle azimuth on the basis of angular velocity sensor information obtained from said angular velocity sensor; a global positioning system (GPS) receiver for detecting a current position of a vehicle using the GPS; a vehicle speed sensor for detecting rotation of a vehicle wheel; a distance measurement unit for measuring a traveled distance on the basis of vehicle speed pulse information obtained from said vehicle speed sensor; a map information storage unit for storing map information; a current position calculation unit for calculating a current position on the basis of GPS information obtained from said GPS receiver, vehicle azimuth information obtained from said vehicle azimuth calculation unit, and distance information obtained from said distance measurement unit, and determining a current position of the vehicle on a map by comparing said calculated current position with said map information read from said map information storage unit; an on-board camera for shooting a periphery of said vehicle; an image recognition unit for recognizing an image obtained from said on-board camera; and a specific road site determination unit for detecting a railroad crossing or an underpass point of a multi-level interchange from said image recognized by said image recognition unit, wherein said current position calculation unit further corrects said determined current position of said vehicle such that said railroad crossing or said underpass point of a multi-level interchange detected by said specific road site determination unit corresponds to said current position of said vehicle.
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3. A navigation system comprising:
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an angular velocity sensor for detecting a change in an advancement direction of a vehicle; a vehicle azimuth calculation unit for calculating a vehicle azimuth on the basis of angular velocity sensor information obtained from said angular velocity sensor; a global positioning system (GPS) receiver for detecting a current position of a vehicle using the GPS; a vehicle speed sensor for detecting rotation of a vehicle wheel; a distance coefficient calculation unit for calculating a vehicle speed pulse coefficient that determines a distance advanced in a single revolution of said vehicle wheel; a distance measurement unit for measuring a traveled distance on the basis of vehicle speed pulse information obtained from said vehicle speed sensor and said vehicle speed pulse coefficient calculated by said distance coefficient calculation unit; a map information storage unit for storing map information; a current position calculation unit for calculating a current position on the basis of GPS information obtained from said GPS receiver, vehicle azimuth information obtained from said vehicle azimuth calculation unit, and distance information obtained from said distance measurement unit, and determining a current position of a vehicle on a map by comparing said calculated current position with said map information read from said map information storage unit; an on-board camera for shooting a periphery of said vehicle; an image recognition unit for recognizing an image obtained from said on-board camera; and an inter-intersection distance calculation unit for calculating a distance between a plurality of intersections detected on the basis of pedestrian crossings recognized by said image recognition unit, wherein said current position calculation unit further corrects said determined current position of said vehicle on the basis of said inter-intersection distance calculated by said inter-intersection distance calculation unit, and said distance coefficient calculation unit corrects said vehicle speed pulse coefficient on the basis of said inter-intersection distance calculated by said inter-intersection distance calculation unit.
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4. A navigation system comprising:
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an angular velocity sensor for detecting a change in an advancing direction of a vehicle; a vehicle azimuth calculation unit for calculating a vehicle azimuth on the basis of angular velocity sensor information obtained from said angular velocity sensor; a global positioning system (GPS) receiver for detecting a current position of a vehicle using the GPS; a vehicle speed sensor for detecting rotation of a vehicle wheel; a distance measurement unit for measuring a traveled distance on the basis of vehicle speed pulse information obtained from said vehicle speed sensor; a map information storage unit for storing map information; a current position calculation unit for calculating a current position on the basis of GPS information obtained from said GPS receiver, vehicle azimuth information obtained from said vehicle azimuth calculation unit, and distance information obtained from said distance measurement unit, and determining a current position of a vehicle on a map by comparing said calculated current position with said map information read from said map information storage unit; an on-board camera for shooting a periphery of said vehicle; an image recognition unit for recognizing an image obtained from said on-board camera; and a road deviation determination unit for determining whether or not said vehicle has deviated from a traveling road by detecting a change in the movement of traffic other than said vehicle on a periphery of said vehicle that is recognized by said image recognition unit, wherein said current position calculation unit further corrects said determined current position of said vehicle on the basis of said determination by said road deviation determination unit as to whether or not said vehicle has deviated from said traveling road. - View Dependent Claims (5)
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6. A navigation system comprising:
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an angular velocity sensor for detecting a change in an advancement direction of a vehicle; a vehicle azimuth calculation unit for calculating a vehicle azimuth on the basis of angular velocity sensor information obtained from said angular velocity sensor; a global positioning system (GPS) receiver for detecting a current position of a vehicle using the GPS; a vehicle speed sensor for detecting rotation of a vehicle wheel; a distance measurement unit for measuring a traveled distance on the basis of vehicle speed pulse information obtained from said vehicle speed sensor; a map information storage unit for storing map information; a current position calculation unit for calculating a current position on the basis of GPS information obtained from said GPS receiver, vehicle azimuth information obtained from said vehicle azimuth calculation unit, and distance information obtained from said distance measurement unit, and determining a current position of a vehicle on a map by comparing said calculated current position with said map information read from said map information storage unit; an on-board camera for shooting a periphery of said vehicle; an image recognition unit for recognizing an image obtained from said on-board camera; and a parking lot entrance/exit determination unit for detecting a specific object indicating a parking lot entrance/exit recognized by said image recognition unit, wherein said current position calculation unit further corrects said determined current position of said vehicle on the basis of said specific object detected by said parking lot entrance/exit determination unit. - View Dependent Claims (7)
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8. A navigation system comprising:
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an angular velocity sensor for detecting a change in an advancement direction of a vehicle; a vehicle azimuth calculation unit for calculating a vehicle azimuth on the basis of angular velocity sensor information obtained from said angular velocity sensor; a global positioning system (GPS) receiver for detecting a current position of a vehicle using the GPS; a vehicle speed sensor for detecting rotation of a vehicle wheel; a distance measurement unit for measuring a traveled distance on the basis of vehicle speed pulse information obtained from said vehicle speed sensor; a map information storage unit for storing map information; a current position calculation unit for calculating a current position on the basis of GPS information obtained from said GPS receiver, vehicle azimuth information obtained from said vehicle azimuth calculation unit, and distance information obtained from said distance measurement unit, and determining a current position of a vehicle on a map by comparing said calculated current position with said map information read from said map information storage unit; an on-board camera for shooting a periphery of said vehicle; an image recognition unit for recognizing an image obtained from said on-board camera; and a traveling road determination unit for detecting a specific object indicating a road recognized by said image recognition unit, said navigation system being characterized in that said current position calculation unit further corrects said determined current position of said vehicle on the basis of said specific object indicating said road, detected by said traveling road determination unit. - View Dependent Claims (9)
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Specification