| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and apparatus for exploring and classifying objects in the bottom of water and capable of easily selecting a frequency having a high level of scattering waves and suitable for classification and accurately classifying objects in the bottom of water. SOLUTION: A transmitter 3 transmits sound waves having a frequency being changed within a prescribed band during a round trip, and a receiver 4 receives their scattered waves to create a distribution of frequency scattering levels having the azimuth angle to an object in the bottom of water as a vertical axis and the frequency as a horizontal axis. On the basis of a created distribution of frequency scattering levels, a frequency having a high intensity of scattering waves and suitable for classification is selected, and a direction level pattern of scattering waves at a selected frequency is extracted and verified with a database in which direction level patterns of the scattering waves are accumulated to classify the object in the bottom of water. COPYRIGHT: (C)2010,JPO&INPIT |
