[Terrain observation by the horseshoe bat Doppler echolocator]

Results of further studies of physical bases of surroundings observations with Rhinophidae echolocator are presented. The observation is carried out due to the presence of pointed down irradiation diagram petal of its probing impulse. The frequency shift and devation of the signal, reflected from elementary surroundings region, induced by Dopler effect, are calculated. It is shown that the presence in the frequency threshold curve of Rhinophidae auditory system of a narrow-tuned filter in the location frequency region and control of the frequency of eminated impulse during flight provide for a response of the auditory system to the signal reflected from each point of surroundings. The resolution thus obtained is evaluated. A technique is suggested for experimental test of the work of the system for surroundings observation.