Map matching method for vehicle safety warning system
First Claim
1. A map matching method for a vehicle safety warning system (VSWS), the method comprising:
- determining if intelligent transportation system (ITS) map data is available;
determining a vehicle location and a vehicle heading;
determining an envelope area around a road feature defined by the ITS map data;
determining a segment heading for a segment of the road feature;
determining a separation distance between the vehicle location and the segment if the vehicle location is located within the envelope area, the segment heading is substantially similar to the vehicle heading, and optionally, the segment elevation is substantially similar to the vehicle elevation; and
map matching the vehicle location to the segment if the separation distance is less than a threshold.
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Accused Products
Abstract
A map matching method for a vehicle safety warning system (VSWS) is provided. The method includes the steps of a) determining if intelligent transportation system (ITS) map data is available, b) determining a vehicle location and a vehicle heading, c) determining an envelope area around a road feature defined by the ITS map data, d) determining a segment heading for a segment of the road feature, e) determining a separation distance between the vehicle location and the segment if the vehicle location is located within the envelope area, the segment heading is substantially similar to the vehicle heading, and optionally, the segment elevation is substantially similar to the vehicle elevation, and f) map matching the vehicle location to the segment if the separation distance is less than a threshold.
27 Citations
12 Claims
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1. A map matching method for a vehicle safety warning system (VSWS), the method comprising:
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determining if intelligent transportation system (ITS) map data is available; determining a vehicle location and a vehicle heading; determining an envelope area around a road feature defined by the ITS map data; determining a segment heading for a segment of the road feature; determining a separation distance between the vehicle location and the segment if the vehicle location is located within the envelope area, the segment heading is substantially similar to the vehicle heading, and optionally, the segment elevation is substantially similar to the vehicle elevation; and map matching the vehicle location to the segment if the separation distance is less than a threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle safety warning system (VSWS) configured to be installed in a vehicle, said system comprising:
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an intelligent transportation system (ITS) map receiver configured to receive ITS map data; a global positioning system (GPS) receiver configured to determine a vehicle location and a vehicle heading; a controller configured to a) receive the ITS map data from the ITS map receiver, b) receive the vehicle location and the vehicle heading from the GPS receiver, c) determine an envelope area around a road feature defined by the ITS map data, d) determine a segment heading for a segment of the road feature, e) determine a separation distance between the vehicle location and the segment if the vehicle location is located within the envelope area, the vehicle heading is substantially similar to the segment heading, and optionally, the vehicle elevation is substantially similar to the segment elevation, and f) map match the vehicle location to the segment if the separation distance is less than a threshold. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification