Radar is an acronym for radio detection and ranging
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The cause of this would be the echo of the sound of their footsteps, however they may not be consciously aware of this mechanism, only that the phenomenon exists and can often be relied upon to detect obstacles.
Echoes make information available about the nature and arrangement of objects and environmental features such as overhangs, walls, doorways and recesses, poles, ascending curbs and steps, planter boxes, pedestrians, fire hydrants, parked or moving vehicles, trees and other foliage, and much more.
Echoes can give detailed information about location (where objects are), dimension (how big they are and their general shape), and density (how solid it is).
Echolocating apparatus according to claim 1 including signal level control means coupled to said echo signal for increasing the level of said echo signal with increasing distance to the reflecting objects.
Echolocating apparatus according to claim 2 including a gain control transistor in said level control means, having a gain control input, coupled to said echo profile signal, and a ramp generator having a ramp output connected to said gain control input for controlling said gain with said ramp.
Echolocating apparatus according to claim 1 including signal chopping means for chopping said echo profile signal at a chopping frequency varying with the distance to the reflecting objects, coupled to said delay means.
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