RU120239U1 - DEVICE FOR DETECTION OF UNDERWATER OBJECTS - Google Patents

Abstract

A device for detecting underwater objects containing a transmitting and receiving part, and the transmitting part consists of a sequentially connected master oscillator of continuous oscillations, a modulator, a power amplifier, an acoustic emitter, and the receiving part consists of an acoustic receiving antenna and an amplifier connected in series, as well as a detector and an indicator , characterized in that the modulator and the master oscillator are made multichannel in the transmitting part, the blocks of a set of carrier and modulation frequencies are introduced, the outputs of the set of carrier frequencies are connected to the inputs of the master oscillator, and the block of modulation frequencies is connected to the inputs of the modulator, a multichannel frequency filter is introduced in the receiving part , and the detector is made in the form of a set of N detectors, and the input of the multichannel filter is connected to the output of the amplifier, the outputs of the multichannel filter through the corresponding detector are connected to the input of the indicator.

Description

The utility model relates to sonar and can be used to create sonar detection systems for underwater objects.

For the extraction of oil and gas on the Arctic shelf, the construction of special ice equipment, transportation means, oil production platforms and infrastructure of the region is necessary, which, in turn, presents special requirements for ensuring their safety.

Of particular threat is the possibility of terrorist acts, sabotage and seizure of offshore facilities of special importance, transport vessels, oil production platforms, navigable hydraulic structures, and other strategic facilities. Sophisticated methods of carrying out terrorist sabotage, their equipment with modern weapons, the availability in free sale of diving equipment of various types and special underwater equipment, the possibility of organizing a surprise attack - all this makes it necessary to use engineering and technical means to ensure the safety of objects from the adjacent water areas, as well as the adoption of organizational measures.

Known sonar having several transceivers and producing a survey in a wide range of water. Japan Patent No. 56-95543, Cl. G01S 15/96. As well as the construction of equipment. L .; Shipbuilding, 1986, p.27.

Sonar, searches for, locates and classifies fish clusters at distances up to 4 km. The operating frequencies used in sonar are in the range from 20 to 50 kHz. The range of sonar is limited by many factors and, first of all, refraction of sound rays, large attenuation of high-frequency signals.

The device contains a transmitting and receiving part, the transmitting part consists of a modulator connected in series, a master oscillator, a power amplifier, an acoustic emitter, and the receiving part consists of a series-connected acoustic receiving antenna, amplifier, detector and indicator. The disadvantages of the known technical solutions include:

- limited range of action;

- high radiation power.

The purpose of the utility model is to increase the detection efficiency of underwater objects crossing the emitter-receiver line.

This goal is achieved by the fact that in the device containing the transmitting and receiving parts, the transmitting part consists of a series-connected modulator, a master oscillator, power amplifier, acoustic emitter, and the receiving part consists of a series-connected acoustic receiving antenna, amplifier, detector and indicator, while in the transmitting part the modulator and the master oscillator are multichannel, blocks of a set of carrier and modulation frequencies are introduced, the outputs of the dialing block are frequency frequencies are connected to the inputs of the master oscillator, and the modulation frequency block is connected to the modulator inputs, a multi-channel frequency filter is introduced in the receiving part, and the detector is made in the form of a set of N detectors, the input of the multi-channel filter is connected to the amplifier output, the outputs of the multi-channel filter are connected through the corresponding detector with indicator input.

In FIG. Functional diagram of the device is presented. It contains;

1 - emitter;

2 - strengthen power;

3 - master oscillator;

4 - modulator;

5 - block set of carrier frequencies;

6 - block set of modulation frequencies;

7 - receiving antenna;

8 - amplifier;

9 - multi-channel frequency filter;

10 - a set of N detectors;

11 - indicator.

The device operates as follows. The master oscillator 3 forms a set of carrier frequencies f _i generated in block 5 of a set of carrier frequencies. This set of carrier frequencies is modulated by modulator 4 with the corresponding set of modulation frequencies F _i generated in block 6 of the set of modulation frequencies. A set of carrier frequencies f _i , amplified by a power amplifier 2, modulated by modulation frequencies F _i , is supplied to a radiator 1 that sequentially irradiates a body of water with this set of frequencies. In the receiving part remote at the required distance, the emitted signal is received by the receiving system 7 and fed through the amplifier 8 to a multi-channel frequency filter 9.

The filtered signal from each channel of the frequency filter enters its detector from a set of N detectors 10. The detected signals are recorded on indicator 11. The presence, size, and motion parameters of underwater objects are judged by the magnitude and duration of attenuation of the components of the emitted signal.

The controlled space is irradiated with a set of tone-modulated signals, the frequencies of which are calculated by the formulas:

;

where f _i and F _i are the frequencies of the carrier and modulation components of the probe signal;

C _zi and V _izi - speed of sound and object at the depth of movement;

L _0i is the length of the object;

γ _i is a dimensionless quantity characterizing the remoteness of an object from the water-air interface;

i is the class number of the detected object;

l _i - the characteristic size of the screening vortices in a perturbed medium, determined by the formulas

; ;

where C _BB is the propagation velocity of internal waves in the medium.

The underwater objects are irradiated with a set of tone-modulated signals, the emitted signal passed through the underwater object (for example, drivers) is received, the component is filtered out, each component is detected, and the presence, size and motion parameters of the underwater objects are judged by the attenuation of the probe signal.

Claims (1)

A device for detecting underwater objects, comprising a transmitting and receiving part, the transmitting part consisting of continuous-oscillating oscillator, modulator, power amplifier, acoustic emitter connected in series, and the receiving part - of acoustic receiving antenna and amplifier connected in series, as well as detector and indicator characterized in that in the transmitting part the modulator and the master oscillator are multi-channel, blocks of a set of carrier and modulation frequencies, outputs are introduced the lock of the set of carrier frequencies is connected to the inputs of the master oscillator, and the block of modulation frequencies is connected to the inputs of the modulator, a multi-channel frequency filter is introduced in the receiving part, and the detector is made in the form of a set of N detectors, and the input of the multi-channel filter is connected to the output of the amplifier, the outputs of the multi-channel filter through the corresponding the detector is connected to the indicator input.