A system for detecting reference points to calculate a position of a moving vehicle comprising a means for detecting the azimuth of each light-reflecting means in respect of the moving vehicle on the basis of the reflected light from the light-reflecting means, a means for calculating the current position...http://www.google.se/patents/US5014204?utm_source=gb-gplus-sharePatent US5014204 - System for detecting position of moving vehicle and system for detecting reference points therefor
