THE MULTI-COMPONENT PUMP SIGNAL’S PARAMETRIC TRANSMITTING ANTENNA FOR SHALLOW WATER HYDROACOUSTIC MONITORING

The possibility of the operational characteristics changing for the multicomponent pump signal’s parametric transmitting array (PTA), in particular, to increase the energy potential of the emerging low-frequency signals of multiple frequencies with a constant width of the main lobe of the directivity pattern (DP), is considered. This is achieved by using phased spectral components located in the passband of the emitting electroacoustic transducer as a pumping signal, and the difference in their frequencies determines the composition of the polyharmonic low-frequency signal generated in the aquatic medium. This method of generating PTA makes it possible to increase the efficiency of generating probe signals, specifically in the long-wavelength range, which is important when measuring the parameters of the movement of a layered marine medium. Features of the formation for the difference frequency wave’s (DFW) broadband radiation allow the use of "virtual" PTA in a new ability — as a tool for indirect estimation of the sea surface’s roughness degree for the sea surface when measuring hydroconditions in coastal waters.