DEVICE FOR HYDROACOUSTIC OBSERVATION OF UNDERWATER SIGNAL AND JAMMING SITUATION Russian patent published in 2007 - IPC B63G9/00 B63G8/39 F41H11/00 

FIELD: marine engineering; marine systems for protection of water areas against unauthorized penetration of low-noise objects into zone of protected technogenic objects.

SUBSTANCE: low-power active detection and direction finding channel includes smoothly oriented directional broad band receiving and radiating sonar antennae overlapping the observation space in horizontal plane within 360^o; this channel also includes power amplifiers at adjustable radiation level, radiation level regulator setting the level of radiation of power amplifiers which corresponds to level of hydroacoustic noise in receiving band; channel also includes master oscillator forming the noise-like sounding transmission to power amplifiers and its copy to reference inputs of multi-channel quadrature correlators, time synchronizer setting the working cycle of low-power active detection and range finding channel, logic unit interlocking the working cycle by signal from passive classification channel, frequency spectrum generator generating the reference signals for multi-channel quadrature demodulators overlapping the Doppler extension of echo signal spectrum; receiving channels for multi-channel Doppler correlation treatment of signals furnished from outputs of respective receiving and radiating antennae; solving unit which is used for comparison of signals at outputs of multi-channel quadrature correlators with threshold magnitude and forming the command for switching-on the active target designation and re-classification section. Each receiving channel consists of band-pass frequency selective amplifier matched by bandwidth with spectrum of sounding transmission and Doppler extension of echo signal spectrum; multi-channel quadrature demodulator and multi-channel quadrature correlator. Number of receiving channels and number of amplifiers is equal to number of receiving and radiating antennae.

EFFECT: increased radius of detection; enhanced noise immunity.

1 dwg