Radar device

1. A radar device comprising:

a first radar and a second radar that are arranged at positions separated from each other, and of which detection ranges are at least partially overlapped; and

an electronic control unit configured to

derive at least one of a moving direction and a velocity vector of a reflection point existing in an overlapped portion of the detection ranges, based on a first detection result of the first radar and a second detection result of the second radar, the first detection result and the second detection result including information on distances to the reflection point from the first radar and the second radar and information on angles of the reflection point viewed from the first radar and the second radar,

when determining that a reliability of a radar angle of the radar device is low, derive a position of the reflection point that is represented using a distance and an angle, based on the first detection result and the second detection result without using the information on the angles obtained from the first detection result and the second detection result, and

after deriving the position of the reflection point, correct a relative angle between the first radar and the second radar when determining that the relative angle deviates from an expected value, the relative angle being a value based on which the at least one of the moving direction and the velocity vector is derived.

2. The radar device according to claim 1 , wherein the electronic control unit is configured to detect at least one of the moving direction and the velocity vector of the reflection point by integrating, in a common coordinate space, first information on the reflection point obtained from the first detection result and second information on the reflection point obtained from the second detection result.

3. The radar device according to claim 1 , wherein the electronic control unit is configured to detect at least one of the moving direction and the velocity vector of the reflection point based on a velocity related to the reflection point obtained from the first detection result and an angle of the reflection point viewed from the first radar, and a velocity related to the reflection point obtained from the second detection result and an angle of the reflection point viewed from the second radar.

4. The radar device according to claim 1 , wherein the electronic control unit is configured to derive the position of the reflection point by using trigonometry, based on the information on distances obtained from the first detection result and the second detection result.

5. The radar device according to claim 1 , wherein

the electronic control unit is configured to collate a stationary target, specified based on the at least one of the moving direction and the velocity vector of the reflection point, with map information.

6. The radar device according to claim 5 , wherein

the electronic control unit is configured to identify a ghost based on a result of collating the stationary target with the map information.

7. The radar device according to claim 1 , wherein the electronic control unit is configured to determine that the reliability of the radar angle of the radar device is low when a degree of a deviation of a reflection point as a result of observing a reference element is larger than a predetermined threshold.

8. The radar device according to claim 1 , wherein the electronic control unit is configured to correct the relative angle based on the position of the reflection point derived by using trigonometry, based on the information on distances obtained from the first detection result and the second detection result.

9. The radar device according to claim 1 , wherein the electronic control unit is configured to correct the relative angle by referencing information on a result of observing a reference element, the information on the result of observing the reference element being stored in the radar device.