Automobile navigation system and road map update system
First Claim
1. A navigation system provided in a vehicle, the system comprising:
- a display device;
a position detector that detects a position of the vehicle as a detection position, wherein the position detector is further configured to carry out at least two positioning types different in accuracy of (i) high-accuracy positioning having a relatively high accuracy and (ii) low-accuracy positioning having a relatively low accuracy;
a map data storage unit that stores road map data;
a map matching unit that performs map matching that matches, based on the detection position and the road map data, the detection position with a point of a road in the road map data, wherein the point is defined to be a map matching position;
a display control unit that causes the display device to display the map matching position together with a road map based on the road map data;
a history storage unit, configured to store position history information, wherein (i) the position history information includes only position information related to the detection position when the high-accuracy positioning is carried out, and (ii) the position history information includes position information related to the detection position and position information related to the map matching position when the low-accuracy positioning is carried out;
a determination unit that, when the vehicle runs on a not-stored road that is not stored in the road map data, determines a trail of running of the vehicle from departure to comeback based on the position history information, wherein the departure is to depart from a first stored road that is stored in the road map data while the comeback is to back into a second stored road that is stored in the road map data; and
a road data generation unit that generates road data corresponding to the trail of running determined by the determination unit and adds the generated road data to the road map data, wherein,when a certain detection position detected when the high-accuracy positioning is carried out is stored in the history storage unit and the certain detection position is different from a map matching position corresponding to the detection position,the road data generation unit calculates a difference between the certain detection position and the corresponding map matching position as a correction vector for the trail of running related to the certain detection position, andthe road data generation unit corrects, based on the calculated correction vector, either (i) the generated road data corresponding to the trail of running related to the certain detection position detected when the high-accuracy positioning is carried out or (ii) road map data to which the generated road data is attached.
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Accused Products
Abstract
A navigation system in a vehicle stores position history information including position information related to a detection position detected by a position detector and position information related to a map matching position. The map matching position is obtained by matching the detection position with a point of a road in road map data. When the vehicle runs on a not-stored road that is not stored in the road map data, the navigation system determines a trail of running of the vehicle from departure from a stored road that is stored in the road map data to comeback into a stored road that is stored in the road map data, based on the stored position history information.
66 Citations
13 Claims
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1. A navigation system provided in a vehicle, the system comprising:
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a display device; a position detector that detects a position of the vehicle as a detection position, wherein the position detector is further configured to carry out at least two positioning types different in accuracy of (i) high-accuracy positioning having a relatively high accuracy and (ii) low-accuracy positioning having a relatively low accuracy; a map data storage unit that stores road map data; a map matching unit that performs map matching that matches, based on the detection position and the road map data, the detection position with a point of a road in the road map data, wherein the point is defined to be a map matching position; a display control unit that causes the display device to display the map matching position together with a road map based on the road map data; a history storage unit, configured to store position history information, wherein (i) the position history information includes only position information related to the detection position when the high-accuracy positioning is carried out, and (ii) the position history information includes position information related to the detection position and position information related to the map matching position when the low-accuracy positioning is carried out; a determination unit that, when the vehicle runs on a not-stored road that is not stored in the road map data, determines a trail of running of the vehicle from departure to comeback based on the position history information, wherein the departure is to depart from a first stored road that is stored in the road map data while the comeback is to back into a second stored road that is stored in the road map data; and a road data generation unit that generates road data corresponding to the trail of running determined by the determination unit and adds the generated road data to the road map data, wherein, when a certain detection position detected when the high-accuracy positioning is carried out is stored in the history storage unit and the certain detection position is different from a map matching position corresponding to the detection position, the road data generation unit calculates a difference between the certain detection position and the corresponding map matching position as a correction vector for the trail of running related to the certain detection position, and the road data generation unit corrects, based on the calculated correction vector, either (i) the generated road data corresponding to the trail of running related to the certain detection position detected when the high-accuracy positioning is carried out or (ii) road map data to which the generated road data is attached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification