Automated highway systems will need sensors both for longitudinal guidance (intelligent speed control) and for lateral guidance relative to the center of the traffic lane. A magnetic sensor combined with a practical magnetic highway marking system provides an all-weather, cost effective lateral guidance technique. The subject system uses a high sensitivity magneto-resistive sensor and a magnetic marking tape which is a variant of existing traffic marking tapes. The field strength and direction is a function of distance above the surface and position laterally with respect to the magnetic axis of the marker. If the sensor is held at an approximately constant height, sensor output contains information about the lateral position with respect to the marker. While movement of the vehicle (and hence the sensor) vertically can cross-couple errors in determining lateral position, orienting the magnetic axis vertically minimizes this error source in the region near the marker. An important data item is the road curvature for the next segment of road. If the system operates with closed loop autonomous lateral control, such feedforward data is important for good performance at highway speeds. A preliminary feasibility demonstration illustrated that the system provides a high signal to noise ratio and good accuracy.
Magnetic lateral guidance sensors for automated highways
Automatische Messung der Seitenposition in der Fahrspur mit einem Magnetsensor
1995
12 Seiten, 6 Bilder, 9 Quellen
Aufsatz (Konferenz)
Englisch
Magnetic lateral guidance sensors for automated highways [2592-17]
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