Movable body which allows detection of axial deviation of axis of surroundings detector

A method of detecting an axial deviation of an axis of a surroundings detector equipped with a movable body, wherein the movable body comprises:

• a surroundings detector that is attached to a predetermined part of the movable body and detects an object present in a predetermined region around the movable body with a predetermined field of view angle having an axis as a center;
• and
• a marker that is provided to the movable body at a position located in front of the surroundings detector as viewed from the surroundings detector and is provided outside a field of view range set based on the field of view angle, the marker being used to detect an axial deviation of the axis of the surroundings detector,
• wherein the surroundings detector is a radar unit, and the axis is a radio wave axis,
• the movable body further includes a radio wave transmissive member that is attached in front of the radar unit as viewed from the radar unit,
• the marker includes a high radio-wave-reflecting member and is provided outside a field of view range of the radar unit set based on the field of view angle projected on the radio wave transmissive member and is provided within a limit sensing range of the radar unit,
• the marker includes a plurality of markers that are provided on the radio wave transmissive member, and
• the plurality of markers are provided so as to surround the radio wave axis of the radar unit and to form a marker field of view,
• the method comprising steps of:
• calculating, by using a computer, amount of axial deviation between the radio wave axis and a marker axis, the marker axis being a central axis of the marker field of view;
• calculating, by using a computer, transmittance of the radio wave transmissive member by using the amount of axial deviation between the marker axis and the radio wave axis;
• and
• calibrating, by using a computer, the amount of axial deviation of the radio wave axis, and calibrating the transmittance.