A method to determine a horizontal error of a radar device mounted on a vehicle along with the mounting error or imbalance in the diameters of wheels based on an echo signal from a reflector provided on a road. A vehicle's traveling locus is stored in advance as a reference locus obtained from the distance...http://www.google.com.au/patents/US5495254?utm_source=gb-gplus-sharePatent US5495254 - Detection and calibration of horizontal error in a scanning type radar device
