Abstract: Apparatus for detecting misalignment of a radar unit (2) of a vehicle (3), the apparatus comprising: an accelerometer (4) arranged to determine the acceleration of the radar unit (2) along three axes, and having an output for a signal indicative of the acceleration; and a processor arranged coupled to the output of the accelerometer; in which the processor is arranged to determine the misalignment based on the acceleration measured by the accelerometer (4), and in which the determination of the misalignment is made: about two axes, if the vehicle (3) is stationary; and about a third axis perpendicular to the two axes when the vehicle is moving.

Abstract: Apparatus for detecting misalignment of a radar unit (2) of a vehicle (3), the apparatus comprising: a rotational speed sensor (1) arranged to measure the rotational speed of the radar unit (2) about at least one axis and having an output for a signal indicative of the rotational speed; and a processor (5) arranged coupled to the output of the rotational speed sensor; in which the processor (5) is arranged to determine the misalignment at least in part based on the rotational speed measured by the rotational speed sensor (1).