In Information Transport Systems, technical and social subjects of automatic driving system and safety transport and traffic system are very important problems. Automatic driving and cruising systems using optical and millimeter radars in the cars are sensor systems for measurements of distances among driving car detection of obstacles, and intelligent recognition of road environments. Optical and millimeter wave radars of short wavelengths and high frequency using short pulses of optical and millimeter wave carriers yield precise distance measurement and shape image recognition. Distance measurement using short pulse optical carriers is derived by time differences between transmitted pulse and received pulse, and image information are given by reflected waves by scanning optical beam waves of laser, as optical vision information. Comparing with millimeter waves optical waves have comparative attenuation characteristics due to rains, mist, fog, and snows, and can give high size resolution. Shape image recognition systems of car bodies complex objects using scattered and reflected waves in scanning laser radars, are very useful for ITS and object recognition. Temporal and spatial characteristics of electromagnetic scattering and reflection by driving car bodies and complex objects are studied Fundamental characteristics and application of scanning laser radars and image recognition of car body and objects are shown.
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