Patent ID: 6169512
Filing Date: 2001-01-02
Classification: G01S

Abstract:
A method of calibrating an object detecting apparatus, the apparatus comprising imaging means having a transmitter for transmitting a signal wave substantially in a predetermined direction, and a receiver for receiving a reflected signal substantially from the predetermined direction, means being provided for altering the predetermined direction, the method comprising the steps of: imaging a detection area having a boundary by transmitting signal waves in a plurality of directions and analysing the received reflected signal waves; positioning signal wave reflector means of known reflection response at a plurality of positions around the boundary of the detection area; imaging the detection area with the signal wave reflector means positioned, by transmitting signal waves in the plurality of directions and analysing the received reflected signal waves; processing the detected images in order to obtain information concerning a boundary parameter of the imaging means at the boundary; and calibrating a transmission parameter of the transmitter for each direction so as to obtain a desired value of the boundary parameter at a part of the boundary corresponding to the respective direction.