Detection device for detecting road surface information related to movable body and control thereof

An object detection device comprising:

• a transmission and reception unit configured to transmit a transmission wave from a movable body moving on a road surface and receive a reflected wave from a road surface;
• and
• a generation unit configured to generate road surface information regarding a change in the road surface based on a difference between echo information indicating a change over time in an intensity of the reflected wave reflected from the road surface and received by the transmission and reception unit and predetermined reference echo information indicating a predetermined change over time in an intensity of a reflected wave from a predetermined road surface,
• wherein the generation unit generates the road surface information based on a difference between a predetermined reference road surface detection period of the predetermined reference echo information which is a reference time period where the intensity is equal to or higher than a predetermined road surface threshold value in the predetermined reference echo information, and a road surface detection period which is a time period during which the intensity of the reflected wave is equal to or higher than the predetermined road surface threshold value in the echo information.