DEVICE FOR MEASURING DISTANCE TO EDGES OF NAVIGATING WAY AND DETECTING OBSTACLES ON IT Russian patent published in 1994 - IPC

FIELD: navigational devices. SUBSTANCE: board transmitting and receiving aerials are disposed inside vessel in close proximity to right and left boards in places where bilge of cylindric part of the vessel changes into bow end of the vessel. Sound-transparent fairings incised into case of the vessel, are installed in front of the aerials. Transmitting aerials are parametric fro two frequencies - height of 70 - 100 lengths of radiating waves and width of 5-7 length of waves. Aerials are oriented in such a manner that resulting directional pattern has angular size 10-20 deg in horizontal plane and 1-1,5 deg in vertical plane. Receiving aerials which have general maximum width at horizontal no less than 20 deg, have resonant frequency being equal to difference in pump frequency of radiating aerials, axes of directional patterns of the aerials are oriented in parallel to axes of resulting directional patterns of radiating aerials and they are disposed in the same horizontal plane. Additional receiving-transmitting aerial which has resonant frequency to be equal to one pump frequency of parametric aerial, has directivity oriented to bottom of the vessel and is located in the vessel's bottom. EFFECT: improved safety. 2 dwg, 11 dwg