Method for protection of water barriers

IPC classes for russian patent Method for protection of water barriers (RU 2364883):

G01S3/80 - using ultrasonic, sonic, or infrasonic waves

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Method for using navigational hydro-acoustic system by underwater devices includes determining position of leading underwater device relatively to responder beacons on basis of distances to responder beacons, determined by measuring expansion times of acoustic signal from underwater device to responder beacons and back. Position of each following underwater device is determined on basis of difference of total distances from leading underwater device to each responder beacon and from each responder beacon to following underwater device and distance from leading underwater device to following underwater device, determined by measuring onboard the following underwater device of differences between moments of receipt of acoustics signals of request of responder beacons by leading underwater device and responses of responder beacons, and distance to leading underwater device and direction towards it, known onboard the following autonomous underwater device.

Mode of using by underwater vehicles of a hydro acoustic system with determination of the location by differences of distances to responder beacons / 2292057

Mode of using by underwater vehicles of a navigational hydro acoustic system is in simultaneous determination of the locations of all underwater vehicles of the group at inquiry by a hydro acoustic signal-command of one of the underwater vehicles of the group of (leading) responder beacons by one of the (driven) responder beacons. The location of each of underwater vehicles is determined by differences of distances to the leading responder beacon and to the drive responder beacon defined by measured intervals of time between reception of an acoustic signal of the request of the responder beacons by the leading responder beacon and acoustic signals of the response of the driven responder beacons. The location of the underwater vehicle is found as an intersection plot of hyperboloid of revolution whose number corresponds to the number of pairs of "leading-driven" responder beacons and focal points are located in installation plots of the corresponding responder beacons and the flatness passing through the center of the hydro acoustic antenna of the underwater vehicle transversely to the flatness of the true horizon.

FIELD: physics, measurements.

SUBSTANCE: invention is related to hydroacoustics and may be used for protection of objects from the barrier side in water medium. According to method, signal is generated from hydroacoustic antenna arranged in the form of piezoelectric cable sections, ends of which are connected to radio frequency cable with the help of matching devices fed from common source, signal voltage is picked up from loading resistor and is sent through separating capacitor to inlet of alarm signal generator, object parametres are identified by results of analysis of spectral and time variation of signal.

EFFECT: higher reliability, higher sensitivity and validity of detection, lower probability of false alarm.

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The invention relates to the field of acoustics and can be used in applied hydro-acoustics - to protect the intakes of nuclear power plants against the penetration of saboteurs, as well as in the fishing industry - to protect the intakes from penetration of biological objects can be used to protect the approaches to the objects, in particular the enterprises in the energy, chemical engineering, defense and other profiles from the milestones in the aquatic environment: water, along river banks, in shallow sea, bays, etc.

The known method and device for the formation, amplification and radiation of high frequency (HF) pump waves at frequencies ω₁and ω₂, pumping signals at frequencies ω₃and ω₄, RF waves at frequency ω₅protective metal mesh intake, education, low-frequency (LF) wave difference frequency Ω=ω₁ω₂education of the RF waves Raman frequencies ω₃±Ω' and ω₃±Ω”, ω₄±Ω' and ω₄±Ω”, the selection signals at frequencies Ω' and Ω” detection, spectral analysis of low-frequency signals, comparing them with the reference signals. Determine course, speed and marine spatial coordinates of the object. Continuously exposed to intense RF waves at frequency ω₅protective metal mesh water is bornago structures. The patent of Russian Federation №2256196, IPC: G01S 15/04, G01S 15/96, 2005

For the protection of aquatic boundaries of the known device that responds to a gap signal line, mechanical vibrations, causing the deformation of the sensing element signal of the boom, and a non-contact device that contains a set of acoustic radiating and receiving elements mounted on the bottom and forming a barrier line boundary. The coordinates of detected offenders relative to the locations of the receivers determine the time and direction of arrival of the echo signals from the infringer to the receivers. French patent No. 1583106, IPC: G08B 23/00, 1969. U.S. patent No. 5305286, IPC: G01S 15/04 1994

A device for protection of water lines containing signal fence, made in the form of a rope which is extended over the water along the protected boundary and fixed to the vertical supports on the rope hanging from the poles with weights on the ends in the form of a pendulum, the sensing element is connected to the driver alarm. The sensing element is designed as a coaxial cable containing the inner and outer conductors separated by insulation from the Teflon tape, the inner conductor is placed in the core of uprugosti.moloko electrically conductive material, PTFE tape is wound on the inner conductor in a spiral with positive PE is critien, on the outer concentric conductor is protective shell, coaxial cable laid under the wire along its axis and rigidly connected to each pole. Patent USSR No. 1819024, IPC: G08B 23/00, 2000

The known method and the intrusion detection device of the underwater object in the monitored region in-situ reservoir, consisting in successive irradiation using sonar emitter various zones controlled water areas and reception of the acoustic signal, proteinopathies with underwater object, sonar receiver, with subsequent determination of the location, course and speed of object motion parameters of a received signal. Receiving the acoustic signal is carried out after its reflection from the reflectors along the elliptical surface, the foci of which are hydroacoustic sonar emitter and receiver, the latter performed with uniform directional characteristic. As a hydroacoustic oscillator using transmitting circular antenna. The patent of Russian Federation №2150123, IPC: G01S 15/04, 2000 Prototype.

The disadvantages of the prototype is the implementation complexity, the need to install reflectors on the big waters, the attenuation of the disturbance.

This invention resolves the fault is, has a higher sensitivity, allowing to detect the approach of a trespasser in advance, which increases the duration of the session receipt of the information about the violation and increases the probability of informed decision about the violation of turn.

The technical result of the invention is to enhance reliability, increase the sensitivity and reliability of detection, reducing the probability of false alarm.

The technical result is achieved in that in the method of protection of water lines, including receiving an acoustic signal from an underwater object hydroacoustic receiver with subsequent determination of the parameters of the object shape signal from the sonar antenna, made in the form of antenna segments of the piezoelectric cable, the ends of which are connected with the radio frequency cable with matching devices supplied from a common source, remove the voltage signal from the load resistor and passed through a decoupling capacitor on the input of the shaper alarm, determine the parameters of the object according to the analysis of spectral and temporal variability of the signal.

The invention is illustrated by the drawing, which shows a structural diagram, where 1 - wire, 2 - vertical supports, 3 - antenna antenna segments of piezoelectric cable, 4 - water is the first environment, 5 - cargo, 6 - matching device, 7 - RF coaxial cable, 8 - spacers, 9 - dividing capacitor, 10 - shaper alarm, 11 - load resistor 12 to the power supply voltage.

RF coaxial cable 7 is fixed on the supports 8 and is connected via an isolating capacitor 9 to the input of the shaper alarm 10, and through a load resistor 11 with the output of the power supply 12 all matching device 6, and the second pole of the source voltage E_pconnected to the grounded shielding braid of the coaxial RF cable 7.

The device operates as follows. Moving underwater object is a potential violator of the protected boundary in the aquatic environment 4 excites an acoustic wave propagating in the direction of the protected line. The outputs of antenna segments of the piezoelectric cable 3 generate electric signals, increasing as it approaches the offender to turn up to a maximum value when the mechanical contact with at least one of the antenna segments of the piezoelectric cable 3. These signals through a matching device 6 are received in the RF coaxial cable 7. Load all matching device 6 is coaxial RF cable 7 and the load, the loading resistor 11, included between the output (center conductor) of the coaxial RF cable 7 and the terminal of the power supply voltage 12. The second terminal of the power supply 12 is connected to a grounded shielding braid of the coaxial RF cable 7. On load resistor 11 occurs the total voltage signals generated at the outputs of all of the antenna segments of piezoelectric cables 3. The phase shifts between the output signals of the nearest to the scene of the offender antenna segments of the piezoelectric cable 3 is negligibly small, and the signal levels of these segments have the greatest value. High sensitivity antenna segments of the piezoelectric cable 3 to the acoustic pressure and the effect of the summation excited in them signals on the load resistor 11 increase the sensitivity of the device long before direct contact of the offender with the elements of the barrier. Increases the probability of informed decision about the violation of turn.

The voltage signal produced by the load resistor 11 through the decoupling capacitor 9, is fed to the input of the shaper alarm 10 alarm form according to the results of the analysis of spectral and temporal variability of the signal received at the input of the shaper alarm 10, in which the quality of which used a personal computer or signal processor of the audio element.

Method of protection of water lines, including receiving an acoustic signal from an underwater object hydroacoustic receiver with subsequent determination of the parameters of the object, wherein forming the signal from the sonar antenna, made in the form of segments of piezoelectric cable, the ends of which are connected with the radio frequency cable with matching devices supplied from a common source, remove the voltage signal from the load resistor and passed through a decoupling capacitor on the input of the shaper alarm, determine the parameters of the object according to the analysis of spectral and temporal variability of the signal.