System architecture and test results of a carrier phase GPS-based lateral and longitudinal Automated Highway System AHS.

Results are presented of a study concerning the capability of the Global Positioning System (GPS) to provide data for lateral and longitudinal control of Automated Highway System (AHS) vehicles. Recent advances in GPS equipment and techniques offer the potential of centimeter-level position and centimeter-per-second velocity accuracies. Augmentations described provide accurate data when GPS satellite signals are occluded by buildings, bridges and tunnels. A preliminary system architecture is presented that employs GPS techniques for providing precise position and velocity data. (A)