Drive support device
A drive support device includes: an acquisition processing unit that acquires (i) a distance to an object detected based on a result of transmission of a transmission wave and reception of a reception wave that is the transmission wave having returned upon reflection by the object and (ii) a reception level of the reception wave used to detect the distance; and a detection processing unit that detects information about a height of the object, based on a relationship between the distance and the reception level that are acquired by the acquisition processing unit.
1. A drive support device comprising:
an acquisition processing unit configured to acquire: a distance to an object detected based on a result of transmission of a transmission wave and reception of a reception wave that is the transmission wave having returned upon reflection by the object; and a reception level of the reception wave used to detect the distance; and
a detection processing unit configured to detect information about a height of the object, based on a correlation between the distance determined using the reception wave and the reception level of the reception wave that are acquired by the acquisition processing unit,
wherein the detection processing unit detects the information about the height by using as the correlation an amount of fluctuation in the reception level over a change in the distance.
2. The drive support device according to claim 1 , wherein the detection processing unit detects, as the information about the height, a value representing the height, depending on the reception level when the amount of fluctuation in the reception level starts to exceed a threshold over a decrease in the distance.
3. The drive support device according to claim 1 , wherein
the distance acquired by the acquisition processing unit includes a plurality of distances to the object detected based on results of substantially simultaneous transmission of a plurality of transmission waves and reception of a plurality of reception waves that are the plurality of transmission waves having returned upon reflection by the object, and the reception level acquired by the acquisition processing unit includes a plurality of reception levels of the plurality of reception waves each used to detect one of the plurality of distances, and
the detection processing unit uses as the amount of fluctuation a variation with respect to an average value of the plurality of reception levels for each of the plurality of distances.
4. The drive support device according to claim 1 , wherein the detection processing unit detects the information about the height, based on the relationship between the distance and the reception level acquired by the acquisition processing unit and based on set information that is previously set about the relationship.
5. The drive support device according to claim 4 , wherein
the set information includes a predetermined correlation between the distance and the reception level that is previously set in correspondence to a value representing the height, and
the detection processing unit detects the information about the height, depending on a comparison result between: the relationship between the distance and the reception level acquired by the acquisition processing unit; and the predetermined correlation.
6. The drive support device according to claim 5 , wherein
the predetermined correlation includes a plurality of correlations that are previously set in correspondence to cases in each of which the value representing the height belongs to each of a plurality of ranges that are different from each other, and
the detection processing unit detects, depending on a comparison result between the correlation between the distance and the reception level acquired by the acquisition processing unit and on the plurality of relationships, which of the plurality of ranges the value representing the height belongs to.
7. The drive support device according to claim 4 , wherein
the distance acquired by the acquisition processing unit includes a plurality of distances to the object detected based on results of substantially simultaneous transmission of a plurality of transmission waves and based on reception of a plurality of reception waves that are the plurality of transmission waves having returned upon reflection by the object, and
the reception level acquired by the acquisition processing unit includes a plurality of reception levels of the plurality of reception waves each used to detect one of the plurality of distances.