VLF ACTIVE SONAR

摘要

1. An underwater transducer system comprising a plurality of spaced substantially coplanar fluids wave transducers constructed and arranged to transmit fluid wave energy parallel to a common plane, said transducers including faired housing means for reducing fluid friction as said transducers are moved in a given direction parallel to said plane transmitting means coupled to said transducers for supplying frequency modulated output signals thereto over a preselected frequency range, receiving means coupled to said transducers for detecting and displaying the frequency of subsequent reflected signals as a function of time, said transducers being spaced by at least a quarter-wavelength at the lowest frequency in said preselected range.