COMPOSITE OPENING SONAR

PROBLEM TO BE SOLVED: To provide a composite opening sonar that corrects oscillation of a transducer and reduces an influence on composite opening processing. SOLUTION: The composite opening sonar combines a first propagation distance computer for calculating propagation distance to a reference position without oscillating a virtual single sequence, a second propagation distance computer for calculating propagation distance to the reference position by artificially adding the amount of oscillation from an oscillation detection processing part to a plurality of sequences, a correct amount computer for calculating the amount of oscillation from a difference in propagation distance of their outputs, an oscillation corrector for performing oscillation correction to a reception signal based on the amount of oscillation, a PRF controller for controlling transmission timing so that one part of an intermediate position between a transmitter and a receiver corresponding to the i-th transmission wave and the (i+1)-th transmission wave coincides, an oscillation corrector for outputting a reception signal corresponding to the i-th transmission wave and the (i+1)-th transmission wave, an amount-of-self-correction computer for detecting the amount of oscillation from a difference in propagation distance to a target of a reception signal, and a self-oscillation corrector for performing further oscillation correction to a reception signal based on the amount of oscillation, thus performing oscillation correction. COPYRIGHT: (C)2011,JPO&INPIT