RU203448U1 - HIDDEN UNDERWATER MARKING DEVICE - Google Patents

Abstract

The utility model relates to the field of hydroacoustics. It can be used in navigation and positioning systems in marine research, in the defense sector, in diving equipment, underwater archeology. The technical result of the resulting model is an unlimited lifetime (due to the lack of a power source), stealth and high reliability due to simplicity. devices. In this case, the formation of the reflected signal from the passive reflector occurs due to the energy of the probing signal of the search sonar. receiving sonar antenna, as well as a band-pass filter connected between the nonlinear element and the input of the radiating sonar antenna of the reflector It was experimentally established that the layout of the nonlinear reflector was confidently detected in the measuring pool by the layout of the search sonar. At the same time, linear reflectors (corner reflectors made of metal and plastic, flat stones, pieces of wood, etc.) were not recorded even at short distances (less than 1 m).

Description

The utility model relates to the field of hydroacoustics. It can be used in navigation and positioning systems in marine research, in the defense sector, in diving equipment, and underwater archeology.

Known sonar beacon, which is an autonomous underwater device. It constantly emits hydroacoustic pulses to ensure the positioning of various underwater objects [1]. Its disadvantage is the lack of hidden use, as well as the limitation of the operating time due to the high power consumption.

Known sonar transponder beacon. It is an autonomous hydroacoustic device designed to emit a hydroacoustic signal as a result of receiving a hydroacoustic request signal generated by a search sonar. The transponder beacon includes receiving and receiving hydroacoustic antennas, as well as an electronic unit. Its disadvantage is the limited service life due to the discharge of the power supply, as well as the complexity of the device, which reduces reliability [2, 3].

The technical result of the resulting model is an unlimited period of operation (due to the lack of a power source), secrecy of operation and high reliability due to the simplicity of the device. In this case, the formation of the reflected signal from the passive reflector occurs due to the energy of the probing signal of the search sonar.

The achieved technical result is ensured by the introduction of a nonlinear electrical element into the hydroacoustic reflector (transponder) connected to the output of its receiving hydroacoustic antenna, as well as a bandpass filter connected between the nonlinear element and the input of the radiating hydroacoustic reflector antenna.

Figure 1 shows a block diagram of a covert underwater marking device.

The device is a passive nonlinear hydroacoustic reflector 1. It contains a receiving hydroacoustic antenna 2, a nonlinear electrical element 3, a band-pass filter 4, and a radiating hydroacoustic antenna 5.

The hidden underwater marking device works as follows.

The hydroacoustic radiation of the search sonar acts on the receiving antenna 2 of the passive reflector 1. The signal from its output affects the nonlinear electrical element 3. At the output of the nonlinear element, new spectral components appear that are absent in the spectrum of the probing hydroacoustic signal. Bandpass filter 4 highlights the new spectrum frequency in use. The signal with this frequency is fed to the input of the emitting sonar antenna 5, which radiates it back towards the search sonar.

At the same time, the inhomogeneity of the surrounding underwater background (uneven bottom topography, stones, separation of the air and water environment) do not possess nonlinear reflective properties [4]. Therefore, they do not interfere with the proposed device for covert marking of underwater objects.

In order to test the operability of the proposed device, an experiment was carried out in a measuring pool under laboratory conditions.

In the layout of the search sonar used to check the layout of the nonlinear reflector, a dual-frequency mode of operation is used. The frequencies of the emitted signals were 3.5 kHz and 6.5 kHz. The received signal was recorded at a total frequency of 10 kHz. Disc piezoelectric elements with natural resonance frequencies of 3.5 kHz and 6.5 kHz were used in the emitting and receiving hydroacoustic antennas. The voltage across the piezoelectric elements in the radiation mode is 5 V - from the measuring LF generators. The registration of the nonlinear passive reflector reflected from the model was carried out with a V6-9 selective microvoltmeter with a sensitivity of 1 μV. At its input, a narrow-band passive filter was additionally installed at a frequency of 10 kHz.

The layout of the claimed nonlinear passive hydroacoustic reflector included two receiving piezoelectric antennas at frequencies of 3.5 kHz and 6.5 kHz, a nonlinear element (diode D9), a band-pass matching filter for a total frequency of 10 kHz, as well as a resonant piezoelectric emitter of a hydroacoustic signal with a frequency 10 kHz.

It was experimentally established that the layout of the nonlinear reflector was confidently detected in the measuring pool by the layout of the search sonar. At the same time, linear reflectors (corner reflectors made of metal and plastic, flat stones, pieces of wood, etc.) were not recorded even at small distances (less than 1 m)

INFORMATION SOURCES

1. Hydroacoustic beacon // NPP AKMA LLC. [Electronic resource]. Access mode: http://www.npo-akma.ru/mayak.shtml (date of last access: 05/12/2020)

2. Hydroacoustic beacon - responder. Navigation systems. Pacific State University, Khabarovsk // [Electronic resource]. Access mode: http://pnu.edu.ru/media/filer_public/2013/06/03/2012-linnik.pdf (date of last access: 05/12/2020)

3. Karaliun V.Yu. Sonar beacon - responder. Panit RF No. 2125733, IPC G01S 015/74, G01S 007/52.

4. Shcherbakov G.N., Antsselevich M.A. New methods for detecting hidden objects. Chapter 7. Magnetoacoustic method for detecting underwater ferromagnetic objects, Moscow, 2011, 503 p.

5. Tyulin V.N. and others. Theoretical foundations of hydroacoustics. Ed. Naval Academy of Shipbuilding and Weapons named after A.N. Krylova, L., 1955, 279 p.

Claims (1)

A covert underwater marking device consisting of a hydroacoustic reflector containing a receiving and emitting hydroacoustic antennas, characterized in that a nonlinear electrical element is introduced into the hydroacoustic reflector connected to the output of its receiving hydroacoustic antenna, as well as a bandpass filter connected between the nonlinear element and the input of the emitting hydroacoustic reflector antennas.

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