METHOD AND DEVICE FOR DIRECTIONAL PARAMETRIC RECEPTION OF WEAK SIGNALS IN MEDIA Russian patent published in 2003 - IPC

FIELD: radio engineering, directional parametric reception of weak signals in media. SUBSTANCE: invention can find use in parametric converters and antennas with three-wave mechanism of interaction of waves, it can also be employed in underwater acoustics, in seismology, architectural acoustics, nondestructive testing, for diagnostics of mechanisms and machines by acoustic methods. Achievable technical result of invention lies in provision for invariance of directional parametric reception in media and for optimal control over pumping signal by supply of high-frequency pumping signal to inputs of nonlinear hardness of units of converters of oscillatory speeds and pressure when case of vectorphase receiver vibrates together, in determination of density vector of flux of power of low- frequency signal and in establishment of space coordinates of position of low-frequency source by maximal value of density vector of flux of power. Characteristic feature of invention consists in supply of weak signal of low-frequency source to case of vector-phase receiver vibrating jointly and of high-frequency pumping signal to nonlinear hardness of converters of parameters of acoustic field: oscillatory speed of particles of medium and pressure structurally coupled to radiating piezoconverter. Cross-modulated signal of parametric interaction of waves is received, low-frequency component of signal is extracted and used to compute by it vector of density of flux of power of low-frequency source employed to establish coordinates of source which secures detection of source of weak signal in media and its indication. Decamouflaging factor coupled to usage of high-power high-frequency radiator of pumping signal is eliminated. EFFECT: precise establishment of space coordinates of low-frequency sources of acoustic signals in such media as submarines in hydrosphere, downhole tools drilling holes in lithosphere, acoustic radiators of industrial and structural noises in atmosphere. 2 cl, 18 dwg