Abstract: An autonomous agricultural robot, referred to as robot, including: a straddle chassis defining an aisle through which a row of crops can pass, propulsion means for moving the robot in a direction of forward travel, a control unit for controlling the robot and an obstacle-characterization device. This device including: obstacle detection means which are configured to detect an obstacle lying in the path of the autonomous agricultural robot, a processing unit configured so that when an obstacle is detected by the obstacle-detection means, the unit logs the data collected by the obstacle-detection means, and/or processes the data collected by the obstacle-detection means and determines at least one characteristic of the detected obstacle.