Navigation system and vehicle position estimating method
First Claim
1. A vehicle position estimating method for a navigation system to calculate a position of a vehicle and display a map of an area around the vehicle and a vehicle position mark on a display, the method comprising:
- providing a sensor to detect a travel distance of the vehicle and an azimuth of the vehicle;
calculating a turning radius of the vehicle by using a signal output from the sensor; and
estimating a vehicle position on a road link by using the turning radius.
1 Assignment
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Accused Products
Abstract
A turning direction calculating unit determines a turning direction of a vehicle based on a change in azimuth of the vehicle. An angular velocity calculating unit calculates an angular velocity of the vehicle. A turning radius calculating unit calculates a turning radius of the vehicle by using the angular velocity and a travel distance of each predetermined time period. A turning radius correcting unit corrects the turning radius so that the turning radius becomes larger by a correction value WL according to a traveling position on a road if the vehicle turns to the left, and corrects the turning radius so that the turning radius becomes smaller by a correction value WR according to a traveling position on a road if the vehicle turns to the right. A vehicle position estimating unit estimates a vehicle position on a center line of the road by using the corrected turning radius.
50 Citations
25 Claims
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1. A vehicle position estimating method for a navigation system to calculate a position of a vehicle and display a map of an area around the vehicle and a vehicle position mark on a display, the method comprising:
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providing a sensor to detect a travel distance of the vehicle and an azimuth of the vehicle;
calculating a turning radius of the vehicle by using a signal output from the sensor; and
estimating a vehicle position on a road link by using the turning radius. - View Dependent Claims (2, 3, 4, 5)
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6. A vehicle position estimating method for a navigation system to calculate a position of a vehicle and display a map of an area around the vehicle and a vehicle position mark on a display, the method comprising:
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providing a sensor to detect a travel distance of the vehicle and an azimuth of the vehicle;
determining a turning direction of the vehicle on the basis of a change of the azimuth;
calculating a turning radius R of the vehicle by using a signal output from the sensor;
correcting the turning radius R so that the turning radius R becomes larger by a correction value WL according to a traveling position on a road if the vehicle turns in a first direction and correcting the turning radius R so that the turning radius R becomes smaller by a correction value WR according to a traveling position on a road if the vehicle turns in a direction opposite to the first direction; and
estimating a vehicle position on a road link by using the corrected turning radius. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A navigation processing method for a navigation system to calculate a position of a vehicle and display a map of an area around the vehicle and a vehicle position mark on a display, the method comprising:
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providing a sensor to detect a travel distance of the vehicle and an azimuth of the vehicle;
estimating a first vehicle position on an actual traveling line of a road and a second vehicle position on a center line of the road by using a signal output from the sensor and storing the first and second vehicle positions; and
performing navigation control by using the first and second vehicle positions. - View Dependent Claims (14, 15)
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16. A navigation system to calculate a position of a vehicle and display a map of an area around the vehicle and a vehicle position mark on a display, the navigation system comprising:
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a sensor to detect a travel distance of the vehicle and an azimuth of the vehicle;
an angular velocity calculating unit to calculate an angular velocity of the vehicle by using a signal output from the sensor;
a turning radius calculating unit to calculate a turning radius of the vehicle by using the angular velocity and a travel distance of each predetermined time period; and
a vehicle position estimating unit to estimate a vehicle position on a road link by using the turning radius. - View Dependent Claims (17, 18)
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19. A navigation system to calculate a position of a vehicle and display a map of an area around the vehicle and a vehicle position mark on a display, the navigation system comprising:
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a sensor to detect a travel distance of the vehicle and an azimuth of the vehicle;
a turning direction determining unit to determine a turning direction of the vehicle on the basis of a change of the azimuth;
an angular velocity calculating unit to calculate an angular velocity of the vehicle by using a signal output from the sensor;
a turning radius calculating unit to calculate a turning radius R of the vehicle by using the angular velocity and a travel distance of each predetermined time period;
a turning radius correcting unit to correct the turning radius R so that the turning radius R becomes larger by a correction value WL according to a traveling position on a road if the vehicle turns in a first direction and correct the turning radius R so that the turning radius R becomes smaller by a correction value WR according to a traveling position on a road if the vehicle turns in a direction opposite to the first direction; and
a vehicle position estimating unit to estimate a vehicle position on a center line of the road by using the corrected turning radius. - View Dependent Claims (20, 21, 22)
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23. A navigation system to calculate a position of a vehicle and display a map of an area around the vehicle and a vehicle position mark on a display, the navigation system comprising:
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a sensor to detect a travel distance of the vehicle and an azimuth of the vehicle;
a vehicle position estimating unit to estimate a first vehicle position on an actual traveling line of a road and a second vehicle position on a center line of the road by using a signal output from the sensor and store the first and second vehicle positions; and
a navigation control unit to perform navigation control by using the first and second vehicle positions on the basis of a process. - View Dependent Claims (24, 25)
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Specification