Vehicle guidance device, method, and computer program product

1. A vehicle guidance device to be installed in a vehicle for providing path guidance to the vehicle, the device comprising:

a plurality of receivers that receives a ranging information signal via a ultrasonic-wave ranging sensor, the ranging information signal including an ultrasonic-wave ranging signal on which path guidance information for guiding the vehicle to a location is superimposed, the ultrasonic-wave ranging signal being for measuring a distance to an object;

an information extractor that extracts, for each of the receivers, the path guidance information from the ranging information signal; and

a path guide that provides the path guidance on the basis of a distance corresponding to the ultrasonic-wave ranging signal and the path guidance information.

2. The vehicle guidance device according to claim 1 , wherein

the path guidance information includes identification information for identifying a transmitter that has transmitted the ranging information signal, and

the path guide calculates a position and an orientation of the vehicle from the identification information and location information of the receivers, to provide the path guidance.

3. The vehicle guidance device according to claim 2 , wherein

the path guide acquires and stores, in advance, location information of the transmitter associated with the identification information to provide the path guidance on the basis of the location information of the transmitter.

4. The vehicle guidance device according to claim 3 , wherein

upon entry of the vehicle into in a region in which the path guidance is provided, one or more of the receivers receive the location information of the transmitter as the ranging information signal from the transmitter located in the region.

5. The vehicle guidance device according to claim 1 , wherein

the path guidance information includes expected running-path information of the vehicle, and

the path guide comprises an information presenter that presents, on the basis of the expected running-path information, a driver with information for guiding the vehicle along an expected running path corresponding to the expected running path information.

6. The vehicle guidance device according to claim 5 , wherein the path guide comprises a steering control that:

calculates a difference between the expected running path and an actual running path of the vehicle, and

when the difference between the expected running path and the actual running path is equal to or greater than a given value, controls a steering angle of a wheel of the vehicle to decrease the difference to below the given value.

7. The vehicle guidance device according to claim 5 , wherein

the path guide comprises a steering information presenter that:

calculates a difference between the expected running path and an actual running path of the vehicle, and

when the difference between the expected running path and the actual running path is equal to or greater than a given value, provides steering information of the vehicle to decrease the difference to below the given value.

8. The vehicle guidance device according to claim 5 , wherein

the path guidance information includes guiding information to a parking space and information on a parking-end position,

the vehicle comprises, as an operation mode, an automatic parking mode to perform automatic parking, and

upon detection of the vehicle having reached a vicinity of the parking space, the path guide transitions to the automatic parking mode to control the vehicle to reach the parking-end position in accordance with the path guidance information.

9. A vehicle guidance method to be executed by a vehicle guidance device installed in a vehicle, the vehicle guidance device that provides path guidance to the vehicle, the vehicle guidance method comprising:

receiving, by a plurality of receivers, a ranging information signal via a ultrasonic-wave ranging sensor, the ranging information signal including an ultrasonic-wave ranging signal on which path guidance information is superimposed, the ultrasonic-wave ranging signal being for measuring a distance to an object;

extracting, for each of the receivers, the path guidance information from the ranging information signal; and

providing the path guidance on the basis of a distance corresponding to the ultrasonic-wave ranging signal and the path guidance information.

10. A computer program product including programmed instructions embodied in and stored on a non-transitory computer readable medium, wherein the instructions, when executed by a computer, cause a computer to control a vehicle guidance device installed in a vehicle, the device that comprises a plurality of receivers, and provides path guidance to the vehicle, the receivers that receive a ranging information signal via a ultrasonic-wave ranging sensor, the ranging information signal including an ultrasonic-wave ranging signal on which path guidance information for guiding the vehicle to a location is superimposed, the ultrasonic-wave ranging signal being for measuring a distance to an object, the instructions causing the computer to perform:

extracting, for each of the receivers, the path guidance information from the ranging information signal; and

providing the path guidance on the basis of a distance corresponding to the ultrasonic-wave ranging signal and the path guidance information.