Patent UA-101047-C2 (UA)
Title: Hydro-acoustic device for sea pipelines monitoring
Inventor: ZATSERKOVSKYI RUSLAN OLEKSIIOVYCH
IPC: G01S15/00
Filed: 2011-02-23
Abstract: The invention relates to hydro-acoustic devices for sea pipelines monitoring. The device comprises a section of sounding signals, antenna system, section of preliminary processing of analog signals with M-channels for reception and controller of automated control of amplification (ACA), first digital computing system (DCS) for signal processing, second DCS for signal processing, data representation and control. At that the section of sounding signals is arranged as a frequency synthesizer, power amplifier connected with the input to the output “Sound. sign” of the frequency synthesizer. Antenna system is arranged as coaxial acoustic, circular emitter, with diameter – d, equal to wavelength - λo at average frequency of radiation - fo, with height – h, equal to wavelength - λo, connected with input to the output of power amplifier of receiving circular antenna that consists of M first broadband linear acoustic receivers with height h, arranged uniformly with angular separation - Δα in circle of radius - ρ, such that at chosen fo and M linear distance between the neighboring acoustic receivers is smaller compared to half of wavelength - λo, M second broadband linear acoustic receivers η(μ) with height – h, brought into coincidence in height with acoustic receivers ξ(μ) and arranged in circle with radius that is equal to p plus half of wavelength - λo, uniformly with angular separation - Δα at common with acoustical receivers ξ(μ) radii, and separated with the lower cut with respect to the upper plane of the acoustic circular emitting antenna in height by distance - z equal to four wavelengths λo. In the section of preliminary processing of analog signals each of M channels of reception is arranged as an amplifier of noise signals that is arranged as an adder of signals ξ(μ, t) and η(μ, t), pre-selector of noise signals, controlled high frequency (HF) amplifier of noise signals control input of which is connected to the control inputs of the controlled HF amplifiers of noise signals of the other receive chains and with mains of ACA connected to the output of the ACA controller, mixer of HF noise signals and heterodyne signal heterodyne input of which is connected to heterodyne inputs of mixers of noise HF signals and heterodyne signal of other receive chains and connected to the output of the frequency synthesizer "Htr. 1.", intermediate frequency filter (IF) of noise signals, IF amplifier of noise signals connected in series, amplifier of echo-signals arranged as a subtracter connected with the input ″-″ to one of the inputs of the adder of amplifier of noise signals and output of broadband linear acoustic receiver ξ(μ), with the input ″+″ - to the second input of the adder of amplifier of noise signals and output of broadband linear acoustic receiver η(μ), pre-selector of echo-signals, controlled amplifier of HF echo-signals control input of which is connected to the control inputs of the controlled amplifiers of HF echo-signals of the other receive chains and with the main ACA connected to the output of the controller ACA, mixer of echo-signal and heterodyne signal of the other receive chains and connected to the output of the frequency synthesizer "Htr. 2.", IF filter of echo-signals, IF amplifier of echo-signals, connected in series analog-digital converter (ADC), connected with the first and the second inputs to the outputs of the amplifier of noise signals and amplifier of echo-signals, respectively, register of count of noise signals s(μ, v), register of count of echo-signals u(μ, v), inputs of which are connected to each other and connected to the output of the ADT, at that the output of the register of the counts of noise signals s(μ, v) with mains of noise signals is connected to the input of the first exchange channel, output of the register of counts of echo-signals u(μ, v) with main of the echo-signals is connected to the second input of the exchange channel, besides that the first DCS is arranged as a processor of primary space-time processing of noise signals connected with the data input to the output of digital noise signals of the exchange channel and processor of primary space-time processing of echo-signals connected with the data input to the output of the digital echo-signals of the exchange channel, the second DCS is arranged as a processor of secondary spatial processing of noise signals connected with the input to the output of the processor of primary space-time processing of noise signals, processor of secondary spatial processing of echo-signals connected with the input to the output of the processor of primary space-time processing of echo-signals, control, data representation computer, connected with data input with main of digital output processing data to output of the processor of secondary spatial processing of noise signals, processor of secondary spatial processing of echo-signals, with control input with indicator of angular position of antenna system, and with the output to control main with control inputs of frequency synthesizer, ACA controller, processor of primary space-time processing of noise signals, processor of primary space-time processing of echo-signals, processor of secondary spatial processing of noise signals, processor of secondary spatial processing of echo-signals. The invention provides increase of probability of correct reveal at set probability of error alarms.