WO2012128403A1

WO2012128403A1 - Hull communication network of ship using ultrasonic waves, and communication method thereof

Info

Publication number: WO2012128403A1
Application number: PCT/KR2011/001990
Authority: WO
Inventors: 배진호; 이종현; 팽동국; 임용곤; 박종원
Original assignee: 제주대학교산학협력단; 한국해양연구원
Priority date: 2011-03-23
Filing date: 2011-03-23
Publication date: 2012-09-27

Abstract

The present invention relates to a hull communication network of a ship using ultrasonic waves, which takes advantage of the hull as medium, through a communicator that uses ultrasonic waves that easily pass through the hull structure of the ship, and a communication method thereof. In relation to a communication network of a complex hull made of at least one steel structure, the hull communication network of a ship using ultrasonic waves according to the present invention includes at least one ultrasonic terminal for exchanging data through ultrasonic communication and an ultrasonic - ultrasonic repeater for relaying the communication of the at least one ultrasonic terminal. Therefore, the hull communication network may be used as a sub communication network, i.e., for new communication in a ship, and not as a main communication network in situations that require communication in the ship. The present invention relates to a communication system using multi channel ultrasonic communication in a hull in order to transmit/receive a desired signal through multi channel communication by using ultrasonic waves in a complex hull and hull structure. In relation to a communication system using an ultrasonic converter in a hull, the communication system using a multi channel ultrasonic communication in a hull according to the present invention includes: a multi channel transmitter for preprocessing a data signal that is to be transmitted, converting a signal from a serial to parallel signal in order to digitally modulate an encoded signal, and converting an amplified output signal into sound waves in order to transmit the sound wave through a hull and air; a multi channel receiver for converting an ultrasonic signal, which is received from the multi channel transmitter, to an electrical signal in order to covert the ultrasonic signal into a digital signal, and serializing a parallel signal through a decoding process in order to playback an analog signal; and a relay device for amplifying a data signal, which is transmitted from the multi channel transmitter, in order to transmit the amplified data signal to the multi channel receiver. Since communication and relay are available using a hull and a hull structure, communication is provided in an area where communication is unavailable through a typical communication network, and is useful when disaster and emergency situations occur.

Description

Ship's hull communication network using ultrasonic waves and its communication method

The present invention relates to a ship's hull communication network using an ultrasonic wave for communicating the hull to a medium using a communication device using an ultrasonic wave that passes well through the ship's hull structure and a communication method thereof.

Since the radio channel environment of a ship is generally a steel structure, communication using radio waves is a very poor environment. In addition, the structure of the ship is a reinforcement plate structure that can withstand the various forces received by the hull inside the welded steel plate, not a single iron plate. It also consists of various spaces such as engine room and cabin.

Most in-vehicle communication networks are wired networks, and some studies have been conducted to communicate with wireless communication networks using electromagnetic waves. However, since most of the hull structure is made of steel, the wireless communication under study is not only very difficult due to the characteristics of electromagnetic waves, but also due to this problem, the communication network configuration in ships is very complicated.

At present, ultrasonic communication is used in a small number of fields such as remote control and communication in the air, and underwater communication technology is now being researched by research groups all over the world. He is also studying underwater networks.

Prior arts include ULTRASONIC THROUGH-WALL COMMUNICATION (UTWC) SYSTEM, WO 2008/105947, and ULTRASONIC THROUGH-WALL COMMUNICATION (UTWC) SYSTEM in the United States and Ultrasound communication system and related methods (US20070167133). Although proposed, there is no proposal of a communication network using a ship hull as a medium.

An object of the present invention is to provide a hull communication network and a communication method of the ship using the ultrasonic wave for the secondary communication network in the hull by using the hull as the ultrasonic communication passing through the ship's hull structure well.

An object of the present invention is to provide a hull communication network and a communication method of the ship using the ultrasonic wave to configure the hull communication network of the ship by combining the wire communication with the wireless communication using the ultrasonic communication at the same time.

An object of the present invention is to provide a communication system using multi-channel ultrasonic communication in the hull of the ship structure as a medium.

Another object of the present invention is to provide a communication system using multi-channel ultrasonic communication in the hull capable of forming an efficient inboard communication network by processing the input signal of the ultrasonic transducer to configure a communication and relay system according to various output channel conditions. .

It is still another object of the present invention to construct a multi-mode communication system using an ultrasonic transducer to output multi-channel ultrasonic communication in a hull capable of linking an ultrasonic transducer and an existing wired network (telephone line, coaxial line, light beam, etc.) as an output. It is to provide a communication system used.

It is still another object of the present invention to provide a communication system using multi-channel ultrasonic communication in a hull using a multi-transmit and receive ultrasonic transducer using a multi-mode channel.

It is still another object of the present invention to provide a communication system using multi-channel ultrasonic communication in a hull for a high speed and high quality communication system due to the use of a multi-mode transmission method and a multi-mode equalizer in a communication system configuration using a multi-transmit and receive ultrasonic transducer. In providing.

According to a preferred embodiment of the present invention, a hull communication network of a ship using ultrasonic waves includes a communication network in a complex hull composed of one or more steel structures, comprising: one or more ultrasonic terminals for exchanging data through ultrasonic communication; And an ultrasound-ultrasonic repeater for relaying communication of the at least one ultrasound terminal.

As an example, it characterized in that it further comprises an ultrasonic-wired repeater for transmitting the data signal received through the ultrasonic terminal or the ultrasonic-ultrasonic repeater to the terminal connected by wire.

As an example, the ultrasonic terminal may include a transceiving ultrasonic transducer having a matching plate attached to a front surface for optimal matching and transmitting and receiving an ultrasonic signal; A transceiving unit for modulating and transmitting the ultrasonic signal at a rated frequency, demodulating and amplifying a signal received at a nominal frequency, converting the received ultrasonic signal into a digital signal, and receiving the converted signal; And it characterized in that it comprises a terminal for signal processing of the baseband.

As an example, the ultrasonic repeater may include two pairs of transmitting and receiving ultrasonic transducers having a matching plate attached to the front surface for optimal matching, and transmitting and receiving ultrasonic signals; Two pairs of transmitting and receiving units for modulating and transmitting the ultrasonic signal at a rated frequency, demodulating and amplifying a signal received at the rated frequency, and converting the received ultrasonic signal into a digital signal; And a controller for compensating for the attenuation of the ultrasonic signal traveling from the hull and removing noise.

As an example, the ultrasonic-wired repeater may include a transceiving ultrasonic transducer having a matching plate attached to the front side for optimal matching, and transmitting and receiving ultrasonic signals; A transmitter / receiver for modulating and transmitting the ultrasonic signal at a rated frequency, demodulating and amplifying a signal received at a rated frequency, and converting the received ultrasonic signal into a digital signal; A controller for compensating for attenuation of the ultrasonic signal traveling in the hull and removing noise; A signal converter for connecting the physical medium between the ultrasonic wave and the wired network; And a wired port for transmitting an ultrasonic signal through the wire.

As an example, the matching plate may be configured in a form corresponding to the hull surface for optimum impedance matching of the uneven hull.

According to a preferred embodiment of the present invention, a method for communicating ship hulls using ultrasonic waves comprises the steps of: transmitting a communication via an ultrasonic signal from an ultrasonic terminal; Determining whether there is an ultrasonic terminal that can be received through the medium of the hull; Determining whether there is an ultrasonic-ultrasound repeater or an ultrasonic-wired repeater if the receivable ultrasonic terminal does not exist; Transmitting a communication signal when a device capable of transmitting the ultrasonic signal exists; Determining whether the terminal is to be finally delivered; And terminating the transmission of the communication signal when the ultrasonic signal is delivered to the final receiving terminal.

Communication system using multi-channel ultrasonic communication in the hull for achieving the above object of the present invention is a communication system using the ultrasonic transducer in the hull, pre-processing the data signal to be transmitted, and converts the signal from serial to parallel A multi-channel transmitter for digitally modulating the encoded signal and converting the amplified output signal into sound waves for transmission through the hull and air; A multi-channel receiver for converting an ultrasonic signal received from the multi-channel transmitter into an electrical signal, converting the ultrasonic signal back into a digital signal, and serializing a parallel signal through a decoding process to reproduce an analog signal; And a relay device for amplifying a data signal transmitted from the multichannel transmitter and transmitting the amplified data signal to the multichannel receiver.

As an example, the apparatus may further include an interference canceling relay device for canceling interference of the data signal transmitted from the multichannel transmission.

As one example, the multi-channel transmitter, the second sensor unit; A second preprocessor for preprocessing the signal input from the second sensor unit; A third A / D converter for converting the signal processed by the second preprocessor into a digital signal; An S / P converter converting the serial signal converted by the third A / D converter in parallel; A space-time encoder for encoding the signal converted by the S / P converter into a space-time code; A modulator for modulating data generated by the space-time encoder; A third D / A converter for converting the signal generated by the modulator into an analog signal; At least one second ultrasonic amplifier for amplifying the signal generated by the third D / A converter; And at least one ultrasonic transducer for converting the electrical signal amplified by the second ultrasonic amplifier into an ultrasonic signal.

As one example, the multi-channel receiver includes: one or more ultrasonic transducers for converting ultrasonic signals passing through the hull and air channels into electrical signals; At least one band filter unit for filtering the signal generated by the ultrasonic transducer into a signal having a desired band; A fourth A / D converter for converting the signal generated by the band filter to a digital signal; A demodulator for demodulating the digital signal generated by the fourth A / D converter; A space-time decoder for performing spatio-temporal source decoding and space-time decoding on the signal generated by the demodulator; An equalizer for removing the influence of a channel on the signal generated by the space-time decoder; A P / S converter for converting the parallel signal generated by the space-time decoder into a serial; A D / A converter for converting the converted digital signal into an analog signal; And a second reproducing unit for reproducing the signal in accordance with the purpose of the transmission signal.

As one example, the relay device includes: a multiple reception ultrasound transducer for converting the multiple reception ultrasound signal into an electrical signal; A simple relay unit comprising one or more simple amplification relay modules for amplifying an output signal of the multiple reception ultrasonic transducer; And a multiple transmission ultrasonic transducer for converting the output electrical signal of the simple relay into a sound wave signal.

As an example, the simple amplification relay module of the simple relay unit may include: a first AGC unit for adjusting a gain of an input signal; A second band filter unit for filtering the output of the first AGC to a desired band; A third ultrasonic amplifier for amplifying the output signal of the second band filter unit; And an AVC unit for adjusting an output voltage of the output of the third ultrasonic amplifier.

As one example, the interference elimination relay apparatus may include a multiple reception ultrasonic transducer for converting a multiple reception ultrasonic signal into an electrical signal; And an interference canceling relay unit configured of at least one interference canceling relay module for canceling interference of an output signal of the multiple reception ultrasonic transducer and a multiplex transmission ultrasound transducer for converting an output electrical signal of the interference canceling relay unit into a sound wave signal. It features.

As an example, the interference cancellation relay module unit may include: a second AGC unit for adjusting a magnitude of an input signal; A fifth A / D converter for converting the output of the AGC unit to digital; A third band filter unit for band filtering the output of the A / D converter; An interference cancellation unit for removing interference from an output signal of the third band filter unit; A fifth D / A converter converting the output signal of the interference canceller into an analog signal; And a fourth ultrasonic amplifier for amplifying the output signal of the fifth D / A converter.

As one example, the interference cancellation unit, an error calculation unit for calculating the input signal; A fourth band filter unit for band filtering the error calculation unit output signal; A delay unit for delaying an output signal of the band filter unit; An adaptive filter unit for removing interference from the output signal of the delay unit through an adaptive filter, including an interference cancellation algorithm unit for generating an adaptive filter coefficient using the output signal of the delay unit and a signal generated by the delay unit. It is characterized by.

The hull communication network of a ship using ultrasonic waves according to the present invention and a communication method thereof are particularly useful in a difficult communication environment of a ship having a complicated structure by communicating the hull with a medium using a communicator using an ultrasonic wave that passes well through the ship's hull structure. In case of an urgent situation in an area where communication is difficult due to the damage of the existing communication network, it is possible to perform a role as a secondary communication network and have an effect that can be used for disaster communication with a sailor in an emergency situation.

By the above configuration, the present invention enables the communication to the area that cannot be covered by the existing communication network because the communication and relay using the hull and the hull structure, and also in the event of disasters and other emergencies You can implement this possible system.

In addition, since the communication network can be configured by wire or wireless according to various requirements of input and output signals, it is possible to construct an efficient and economical communication and relay system in connection with the existing communication network, and to enable multi-mode transmission and reception. Because of the system, high speed and high efficiency transmission is possible.

In addition, since the system includes a multimode equalizer and an interference cancellation unit, high-speed, high-quality signals and data transmission are possible, and various interference signal cancellation algorithms can be applied to ensure system performance in various multimode channel situations. There is an effect to implement a communication system.

1 is a view showing the configuration of a hull communication network using ultrasonic waves in accordance with a preferred embodiment of the present invention.

2 is a view showing the configuration of a hull communication network bonded to a wired network according to a preferred embodiment of the present invention.

Figure 3 is a block diagram showing the configuration of an ultrasonic terminal according to an embodiment of the present invention.

Figure 4 is a block diagram showing the configuration of the ultrasonic-ultrasound repeater according to a preferred embodiment of the present invention.

Figure 5 is a block diagram showing the configuration of the ultrasonic-wired repeater according to a preferred embodiment of the present invention.

6 shows a spherical waveguide;

7 shows a vibration mode of a steel sheet.

8 illustrates a vibration mode of an H-beam.

9 is a flowchart illustrating a communication method using ultrasonic waves in a hull according to a preferred embodiment of the present invention.

10 is a view showing a communication system using the hull multi-mode ultrasound in accordance with a preferred embodiment of the present invention.

11 is a block diagram showing the configuration of a transmitter of a communication system using a single ultrasonic transducer according to a preferred embodiment of the present invention.

12 is a block diagram showing the configuration of a receiver of a communication system using a single ultrasonic transducer according to a preferred embodiment of the present invention.

13 is a block diagram showing the configuration of a multi-channel transmitter of a communication system using a multi-sonic wave transducer according to a preferred embodiment of the present invention.

14 is a block diagram illustrating a configuration of multiple receivers of a communication system using multiple ultrasonic transducers according to an exemplary embodiment of the present invention.

15 is a diagram showing the configuration of a simple relay apparatus using multiple ultrasonic transducers according to a preferred embodiment of the present invention.

16 is a block diagram showing a simple amplified relay module configuration of a simple relay of a simple relay using multiple ultrasonic transducers according to an exemplary embodiment of the present invention.

17 is a view showing the configuration of the interference cancellation relay apparatus using a multiple ultrasonic transducer according to an embodiment of the present invention.

18 is a block diagram showing a configuration of an interference canceling relay module of an interference relay of an interference canceling relay apparatus using multiple ultrasonic transducers according to an exemplary embodiment of the present invention.

19 is a block diagram illustrating a configuration of an interference canceling unit of an interference canceling relay module of an interference cancellation relay apparatus using multiple ultrasonic transducers according to an exemplary embodiment of the present invention.

1 Hull 2 Ultrasonic-Ultrasonic Repeater

3: ultrasonic terminal 8: ultrasonic-wired repeater

400: multi-channel transmitter 402: second sensor unit

404: second preprocessing unit 406: third A / D conversion unit

408: S / P converter 410: Space-time encoder

412: modulator 414: third D / A converter

416: second ultrasonic amplifier 500: multi-channel receiver

502: first band filter unit 504: fourth A / D converter

506: demodulator 508: space-time decoder

510: equalizer 512: S / P conversion unit

514: fourth D / A converter 516: second playback unit

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 9.

The present invention proposes a communication network that communicates the hull as a medium by using a communication device using ultrasonic waves that pass well through the ship's hull structure, so that it can be used as a new in-vessel communication as a secondary communication network instead of the main communication network in various situations where in-vessel communication is required. It is proposed that such a system is called a SBAN (Ship Body Area Network).

1 is a view showing the configuration of a hull communication network using ultrasonic waves according to a preferred embodiment of the present invention, Figure 2 is a view showing the configuration of a hull communication network bonded to a wired network according to a preferred embodiment of the present invention.

Ship Body Area Network (SBAN) is a communication network for exchanging data by ultrasonic communication with each other, located at a distance where various ultrasonic communication nodes in a ship can communicate with each other. Speaks ultrasonic communication. In addition, as shown in Figure 2 by the combination of the ultrasonic communication using the hull and the existing wired communication network it is possible to communicate anywhere in the vessel.

As shown in FIG. 1, a hull communication network, in a complex hull communication network composed of one or more steel structures, includes at least one ultrasonic terminal 3 and at least one ultrasonic terminal 3 for exchanging data through ultrasonic communication. It is composed of an ultrasonic-ultrasound repeater (2) for relaying the communication.

If the ultrasonic terminal 3 is located at a distance that can communicate with each other in the ship's hull communication network, it is possible to communicate with each other through the hull like a dashed-dotted line 6, and it is difficult to communicate with each other due to the long distance or the hull structure of the ship. When communicating with the ultrasonic terminal 3 at the position, it passes through the hull like the broken line 4 and passes through the hull like the broken line 5 through the ultrasonic-ultrasound repeater 2 to communicate with other ultrasonic terminals 3. Or after passing through the hull as a broken line (4), passing through the ultrasonic-ultrasound repeater (2), and communicating with other terminals, such as the broken line (7), via another ultrasonic-ultrasonic repeater (2) through the hull as a solid line (6). can do.

As shown in FIG. 2, the hull-wired communication network is composed of a ship hull 1, an ultrasonic-ultrasound repeater 2, an ultrasonic-wired repeater 8, and an ultrasonic terminal 3.

When the ultrasonic terminals 3 are located at a distance capable of communicating with each other in the ship's hull communication network as shown in FIG. 1, the terminals can communicate with each other only by passing through the hull and are difficult to communicate with each other due to the long distance or the hull structure of the ship. In the case of communicating with the ultrasonic terminal 3 of the present invention, it passes through the hull as shown by the broken line 9 and passes through the wireline like the solid line 10 through the ultrasonic-wired repeater 8 and again passes the ultrasonic-wired repeater 8. It passes through the broken line 11 and communicates with other ultrasonic terminals 3. Also, the area where the wired network is not completely installed is passed through the hull like the broken line 14 in the ultrasonic terminal 3 and passes through the hull like the solid line 13 through the ultrasonic-ultrasound repeater 2, and then again the ultrasonic-wired repeater. After passing through the solid line 12 through (8) and through the ultrasonic-wired repeater (8) to pass through the hull, such as the broken line (9) to communicate with other ultrasonic terminals (3).

The hull communication network (SBAN) basically establishes a communication network as shown in FIG. 1, and if a conventional wired network is used, a communication network can be established as shown in FIG. 2 after linking with a wire with an ultrasonic-wired repeater 8.

This communication network is able to communicate freely in the area of the ship that cannot communicate with the existing communication network, and when the ship is damaged and loses the existing wired network, ultrasonic communication is carried out through the hull as a medium. It can be used as disaster communication to overcome disasters.

3 is a block diagram showing the configuration of an ultrasonic terminal according to a preferred embodiment of the present invention.

As shown in FIG. 3, the ultrasonic terminal 3 has a fixed type fixed to the hull of a ship and a mobile type capable of communicating by being detached and attached to the hull freely. And it represents the ultrasonic terminal is composed of a transmission and reception ultrasonic transducer 15, the transceiver 16 and the terminal 17. The ultrasonic wave is basically composed of a transmitting ultrasonic wave and a receiving ultrasonic transducer 15 having a nominal frequency, and in the case of simple unidirectional communication, an ultrasonic transducer 15 capable of both transmitting and receiving can be used. The ultrasonic transducer 15 used in the ultrasonic terminal should be designed to have the best impedance matching with the hull. In the case of the fixed type, the optimum matching condition can be installed at the position to be already installed. The optimum impedance matching of the structural material varies depending on the position of the hull, so an impedance matching plate is attached to the front of the transducer in contact with the hull. Transmitter / receiver 16 first modulates at various frequencies at the rated frequency during transmission, and constructs a circuit for optimal transmission output by appropriate amplification according to the input characteristics of the transducer, and the impedance of the input of the transducer and the output of the transmitter. A circuit configuration is required for matching. In the case of reception, it consists of a circuit which generally demodulates the signal received at the rated frequency to the baseband frequency f _b , amplifies it, and converts it into digital data using an analog to digital (A / D) converter. However, if you use a high speed A / D converter, you can also receive software demodulation using only the amplifier. The terminal 17 is made in a form capable of voice communication, video communication, measurement data communication and all communication. In addition, various communication methods are possible such as time-division multiplexer (TDM), frequency-division multiplexer (FDM), and code-division multiplexer (CDM). All operations to process the signal of the terminal 17 is performed. However, hardware specification is different according to data type and communication method, and software processing is designed to perform according to purpose. However, in the case of voice communication, only the analog communication may be possible, and thus the transceiver 16 and the controller 18 may be manufactured by inserting only the minimum analog filter function without using the A / D converter.

Figure 4 is a block diagram showing the configuration of an ultrasonic wave ultrasonic repeater according to a preferred embodiment of the present invention.

As shown in FIG. 4, the ultrasonic-ultrasound repeater 2 is shown, and is composed of two pairs of transducers 15 for transmitting and receiving, two pairs of transceivers 16 and a controller 18.

Transmitting and receiving transducer 15 and transmitting and receiving unit 15 is the same function in the ultrasonic terminal 16, the controller 18 performs the interconnection function of the physical medium, which is a unique function of the repeater in the case of the basic node proceeds in the hull It compensates for the signal attenuation and removes noise. And when used as a node of a server, it is manufactured with high specification hardware to perform more complicated functions. That is, for a basic node, which is a function of a basic repeater, for example, when a signal is received from an ultrasonic transducer, the transceiver 16 demodulates and passes through a filter such as analog noise cancellation from the controller 18, and then the transceiver ( In 16), the modulation is transmitted through the hull, and the server node is preferably designed for digital signal processing.

Figure 5 is a block diagram showing the configuration of an ultrasonic-wired repeater according to a preferred embodiment of the present invention.

As shown in FIG. 5, the ultrasound-wired repeater 8 includes a transceiving transducer 15, a transceiving unit 16, a controller 18, a signal converter 19, and a wired port 20. Transmitting and receiving transducer 15 and the transmitting and receiving unit 15 is the same as the description in the ultrasonic terminal 16, the controller 18 is the same as the function to perform in the ultrasonic-ultrasound repeater 2 of FIG.

Unlike the case of FIG. 4, the repeater of FIG. 5 functions to interconnect the physical medium between the ultrasonic wave and the existing wired network of the ship by using the signal converter 19. The signal converter 19 communicates with the controller 18 in digital data, but the interconnection with the cable performs a wrong operation depending on the type of the wired port 20. First, for example, when the wired port 20 is connected to the optical cable, the signal converter converts the optical signal into an electrical signal when receiving the optical signal, and in the case of the server node, converts it into a digital signal and transmits it to the controller or in the case of the basic node After the signal is transmitted as it is, the controller 18 processes and transmits the signal to the hull as an ultrasonic signal through the transceiver 16 and the ultrasonic transducer 15. When receiving an ultrasonic signal, the transmission and reception unit 16 converts the optical signal through the controller and the signal changer to transmit the wired port 20. When the existing wired network is a coaxial cable, a TCP / IP cable, etc., the signal converter 19 converts signals in accordance with the wired network communication.

6 shows a rectangular waveguide.

When using the hull steel plate as a channel for ultrasonic communication as shown in FIG. 6, when the steel plate is regarded as an acoustic waveguide, a cutoff frequency at which a traveling wave may be generated may be calculated as shown in Equation 1 below.

(Equation 1)

For example, assuming that L _x = 1 m, L _y = 3 cm, L _z = ∞, and c is Dependent on the steel, 5050 m / s, the cutoff frequency of the steel sheet is (1,1) depending on the (m, n) mode. In the case of (10,10) mode, it is 84kHz. In addition, the number of modes according to the rated frequency can be calculated by Equation 2.

(Equation 2)

That is, the wave number in the z direction of FIG. 6 should be a real number, and the number of (m, n) modes satisfying this condition can be calculated according to the rated frequency. In Equation 2, the rated frequency is calculated by putting w = 2πf,

Can be calculated with

here

ego,

to be. For example, if 100kHz is used as the rated frequency, 21 modes are created from (1,1) to (1,21) mode.If 1MHz is used as the rated frequency, modes (1,1) to (11,149) are available. Generated by traveling waves. The hull of a ship is made of various steel structures such as steel plates, and several modes exist in the hull when communicating with ultrasonic waves. Therefore, a communication method considering such a mode can be applied. For example, MIMO (Multi Input Multi Output) can also be considered.

7 is a view showing a vibration mode of the steel sheet.

FIG. 7 shows a basic example in which natural vibration mode characteristics of the steel sheet can be grasped when the hull steel sheet is used as a channel for ultrasonic communication. This example calculates the natural vibration mode of the steel plate with the software of COMSOL. The natural vibration will exist in a number of modes depending on the size of the steel plate, the size of the ship, but Figure 7 shows a result of the sixth mode. For the simulation, the steel plate was considered to have a fixed boundary of a steel plate 1m in width and length and 3cm in thickness, and 266Hz vibration (21), the first mode of natural vibration mode, and 790 Hz (22), the fourth mode, The vibration mode of the fifth mode 959 Hz (23) and the sixth mode 964 Hz (24) is shown. The Young's modulus is 2 × 10 ¹¹ Pa, Poisson's ratio is 0.33, steel plate density is 7850 kg / m ³ , and coefficient of thermal expansion is 1.2 × 10 ^-5 1 / K. Was used. For optimum communication channel, vibration mode of basic unit steel plate should be calculated to select rated frequency.

8 is a diagram illustrating a vibration mode of an H-beam.

Figure 8 shows the vibration mode according to the size of the H-beam shape that is often used as a reinforcement of the hull. H-beam cross-section having the same characteristics as the steel used in FIG. 7 The width of both the horizontal and vertical length is 31cm, both the thickness is 2cm and the H-beam length is 2m, assuming that both ends are fixed, the first unique The vibration mode of each mode is shown when the vibration mode is 250Hz (25), the third mode 309Hz (26), the fourth mode 326Hz (27), the sixth mode 423Hz (28). In fact, the ship is composed of many reinforcing structures and steel plates, so more accurate modeling and complex calculations are required for more accurate calculations, and the mode coupling effect of steel plate and H-beam must be considered.

Communication is transmitted from the ultrasonic terminal through an ultrasonic signal (S100).

It is determined whether there is an ultrasonic terminal that can be received through the hull medium (S102).

If the receivable ultrasound terminal does not exist, it is determined whether there is an ultrasound-ultrasound repeater or an ultrasound-wired repeater (S110).

If there is a device capable of transmitting the ultrasonic signal, the communication signal is transmitted (S104).

Finally, it is determined whether the ultrasonic terminal to be delivered (S106).

When the ultrasonic signal is delivered to the final receiving terminal, the communication signal transmission ends (S108).

As described above, by communicating the hull with a medium using a communication device using ultrasonic waves that pass well through the hull structure of the ship, in a difficult communication environment of the ship formed in a complex structure, in particular in an area difficult to communicate due to damage to the existing communication network When a situation occurs, it is possible to play the role of secondary network and to be used for disaster communication with crew members in emergency situation.

The above description has been described as an example by the embodiment of the present invention, but is not limited to the above-described embodiment and those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. . Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description in the specification but should be defined by the claims.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 10 to 19.

A ship body area network (SBAN) using ultrasonic waves can be configured using a single or multi sensor.

In addition, the repeater structure for communication signal relay can also be configured using a single or multiple sensors.

As shown in FIG. 10, a relatively simple multimode channel may be formed. However, when the hull structure is very complicated, a very complex multimode channel should be considered as illustrated.

The transmitter 200 of the communication system using a single ultrasonic transducer includes a first sensor unit 202, a first preprocessor 204, a first A / D converter 206, an encoder 208, and a digital modulator. 210, an analog modulator 216, a first D / A converter 212, a first ultrasonic amplifier 214, and an ultrasonic transducer 221.

The first sensor unit 202 detects a signal to be sent. This part consists of sensors that can input audio, video and data, and means various sensors that can detect human body communication signals as well as wired input terminals such as microphones, cameras and USB input ports.

The first preprocessor 204 detects and preprocesses each signal input from the first sensor unit 202 and determines analog or digital modulation according to characteristics of the signal.

The first A / D converter 206 refers to an apparatus for efficiently converting a signal to digital in consideration of the bandwidth and data rate of the detection signal in the sensor and the preprocessor. The A / D converter does not perform the analog modulation.

The encoder 208 performs source encoding or channel encoding on the data digitized by the first A / D converter 206, and may use various encoding methods according to the characteristics of the data.

The digital modulator 5 is a unit that performs various digital modulations on the signal encoded by the encoder 208, and may use modulation schemes such as CDM, FDM, TDM, and the like.

The analog modulator 2166 performs analog modulation on the signal generated by the first preprocessor 204, and may use various modulation methods such as AM, FM, and PM.

The first D / A converter 212 is a unit that performs various digital modulations on the signal encoded by the encoder 208.

The first ultrasonic amplifier 214 amplifies the signal output from the modulator.

The ultrasonic transducer 221 is a device that converts the electrical signal generated by the first ultrasonic amplifier 214 into sound waves.

The receiver 300 includes an ultrasonic transducer 220, a band pass filter 302, a second A / D converter 304, a digital demodulator 306, an analog demodulator 316, a decoder 308, The equalizer 310, the second D / A converter 312, and the first playback unit 314 are provided.

The ultrasonic transducer 220 is a device that converts the ultrasonic signal passing through the hull and the air channel into an electrical signal.

The band filter unit 302 is a part for filtering the signal generated by the ultrasound transducer 220 into a signal of a desired band.

The second A / D converter 304 converts the signal generated by the band filter 302 into a digital signal, and efficiently converts the signal into digital in consideration of the bandwidth and data rate of the signal. Device.

The digital demodulator 306 demodulates the digital signal generated by the second A / D converter 304.

The analog demodulator 316 demodulates the continuous signal generated by the band filter 302.

The equalizer 310 is a part for removing the influence of the channel from the signal generated by the digital demodulator 306. This part removes the influence of air channel and multi-mode channel of the hull and can be used in time domain, frequency domain and space domain.

That is, it is possible to use the time domain LMS and RLS algorithm, the frequency domain FFT, DCT based algorithm.

The second D / A converter 312 is a part for reproducing an analog signal in the equalizer.

The first reproducing unit 314 reproduces a signal in accordance with the purpose of the transmission signal. In other words, the final output signal is audio, video, data, and the like.

FIG. 13 is a block diagram illustrating a configuration of a multi-channel transmitter of a communication system using a multi-ultrasonic transducer according to a preferred embodiment of the present invention.

The multi-channel transmitter 400 may include a second sensor unit 402, a second preprocessor 404, a third A / D converter 406, an S / P converter 408, and a space-time encoder 410. , A modulator 412, a third D / A converter 414, a second ultrasonic amplifier 416, and an ultrasonic transducer 221.

The second sensor unit 402 detects a signal to be sent. This part consists of sensors that can input audio, video and data, and means various sensors that can detect human body communication signals as well as wired input terminals such as microphones, cameras and USB input ports.

The second preprocessor 404 is a unit that detects and preprocesses each signal input from the second sensor unit 402.

The third A / D converter 406 is an apparatus for efficiently converting the signal to digital in consideration of the bandwidth and data rate of the detection signal in the second sensor unit 402 and the second preprocessor 404 Means.

The S / P converter 408 converts a signal generated by the third A / D converter 406 from serial to parallel for spatial multiplexing.

The space-time encoder 410 is a unit that performs spatio-temporal source coding or space-time channel coding on the data parallelized by the S / P converter 408, and may use various encoding methods according to the characteristics of the data.

The modulator 412 is a unit that performs various digital modulations on the signal encoded by the space-time encoder 410, and may use modulation schemes such as CDM, FDM, and TDM.

The third D / A converter 414 digitally modulates the signal encoded by the space-time encoder 410.

The second ultrasonic amplifier 416 amplifies the signal output from the third D / A converter 414.

The ultrasonic transducer 221 is a device that changes the electrical signal generated by the second ultrasonic amplifier 416 into sound waves.

The multi-channel receiver 500 includes one or more ultrasonic transducers 220, a first band filter 502, a fourth A / D converter 504, a demodulator 506, a space-time decoder 508, an equalizer. 510, a P / S converter 512, a fourth D / A converter 514, and a second playback unit 516.

The ultrasonic transducer 220 converts the ultrasonic signal passing through the hull and the air channel into an electrical signal.

The first band filter unit 502 filters the signal generated by the ultrasonic transducer 220 into a signal of a desired band.

The fourth D / A converter 514 converts the signal generated by the first band filter 502 into a digital signal. The fourth D / A converter 514 efficiently converts the signal in consideration of the bandwidth and data rate of the signal. Convert to

The demodulator 506 demodulates the digital signal generated by the fourth D / A converter 514.

The space-time decoder 508 performs space-time source decoding and space-time decoding on the signal generated by the demodulator 506.

The equalizer 510 removes the influence of the channel from the signal generated by the space-time decoder 508. This part removes the influence of air channel and multi-mode channel of the hull and can be used in time domain, frequency domain and space domain. That is, it is possible to use algorithms such as LMS and RLS algorithms in the time domain, FFT in the frequency domain, DCT based algorithms, and STBC, BLAST, etc. in the spatial domain.

The P / S converter 512 converts the parallel signal generated by the space-time decoder 508 into a serial signal.

The fourth D / A converter 514 reproduces an analog signal by the equalizer 510.

The second reproducing unit 516 reproduces the signal in accordance with the purpose of the transmission signal, the signal of the final output is audio, video, data and the like.

FIG. 15 is a diagram illustrating a configuration of a simple relay apparatus using multiple ultrasonic transducers according to an exemplary embodiment of the present invention.

The simple relay device includes one or more receiving ultrasound transducers 220, a simple relay 600 including one or more simple amplifying relay modules 601, and one or more transmitting ultrasound transducers 221.

The receiving ultrasound transducer 220 refers to a multi-sensor capable of receiving an input signal and detecting an ultrasound signal modulated with voice, an image, and data.

The transmitting ultrasound transducer 221 converts the signal generated by the simple relay module 601 into an electric signal.

The simple relay unit 600 amplifies the signal input to the multiple reception ultrasonic transducer.

The simple amplification relay module 601 is a first AGC (Automatic Gain Control) unit 700, a second band filter unit 702, a third ultrasonic amplifier 704, AVC (Automatic Voltage Control) unit 706 Consists of.

The first AGC unit 700 adjusts the size of the signal input to the ultrasonic transducer to an appropriate level.

The second band filter unit 702 is a filter for passing the signal generated by the first AGC unit 700 to a desired band.

The third ultrasonic amplifier 704 converts the electrical signal generated by the second band filter 702 into an ultrasonic signal.

The AVC unit 706 transmits the output of the ultrasonic signal output from the third ultrasonic amplifier 704 to a desired level of power, detects the magnitude of the output and converts it into a voltage, and uses the voltage to convert the output of the amplifier. Adjust

17 is a diagram showing the configuration of an interference cancellation relay apparatus using multiple ultrasonic transducers according to an exemplary embodiment of the present invention.

The interference elimination relay apparatus includes one or more receiving ultrasonic transducers 220, an interference eliminating relay unit 800 including one or more interference eliminating relay modules 801, and a multiple transmitting ultrasonic transducer 221.

The receiving ultrasonic transducer 220 is a multi-sensor for receiving an input signal and detecting an ultrasonic signal in which voice, an image, data, and the like are modulated.

The transmitting ultrasonic transducer 221 converts the signal generated by the interference elimination relay 800 into an electrical signal.

18 is a block diagram illustrating a configuration of an interference canceling relay module of an interference relay unit of an interference canceling relay apparatus using multiple ultrasonic transducers according to an exemplary embodiment of the present invention.

The interference elimination relay module 801 amplifies a signal input to the reception ultrasound transducer 220, and includes a second AGC unit 900, a fifth A / D converter 902, and a third band filter unit 904. ), An interference canceling unit 906, a fifth D / A converter 908, and a fourth ultrasonic amplifier 910.

The second AGC unit 900 adjusts the size of the signal input to the ultrasonic transducer to an appropriate level.

The fifth A / D converter 902 converts the signal generated by the second AGC unit 900 to digital.

The third band filter 904 is a filter for passing the signal generated by the fifth D / A converter 908 to a desired band.

The interference remover 906 removes the interference signal from the signal output from the fifth D / A converter 908 to separate the original received signal.

The fifth A / D converter 902 converts the digital signal generated by the interference canceller 906 into an analog signal.

The fourth ultrasonic amplifier 910 converts the electrical signal generated by the fifth D / A converter 908 into an ultrasonic signal.

The interference canceling unit 906 is the core of the interference cancellation relay module 801, and includes a fourth band filter unit 922, a delay unit 924, an adaptive filter unit 926, an error calculator 920, and an interference cancellation algorithm. It is comprised by the part 928.

The fourth band filter 922 is a filter output by the transmitting ultrasonic transducer to limit the output of the interference signal added to the received ultrasonic transducer to an ultrasonic signal of a desired band.

Before the initial algorithm converges, that is, before the interference is removed, the filter serves to limit the output to the band of the transmitted ultrasound signal.

However, after the interference cancellation algorithm converges, almost no signal is generated outside this band filter, and almost all signals pass through the band.

The delay unit 924 delays the signal generated by the fourth band filter unit 922 for a predetermined time.

Due to the time delay, the interference cancellation performance of the adaptive algorithm is improved by reducing the correlation between the interference signal and the original signal input to the receiving ultrasonic transducer.

The adaptive filter 926 is a part for generating an adaptive filter output based on the signal generated by the delay unit 924 as a reference signal.

In this case, the reference signal used is the output of the delay unit 924 signal, r (t), and the output is output as the product of the adaptive filter coefficient and the reference signal calculated in the previous time interval in the interference cancellation algorithm.

(Equation 3)

y (t) = [w (1) ... w (M)] * [r (1) .... r (M)] ^T

Where T is the transpose matrix.

The error calculator 920 calculates a difference between the estimated interference signal, y (t) and the input signal, s (t) + i (t) generated by the adaptive filter unit 926.

In other words,

(Equation 4)

e (t) = s (t) + i (t)-y (t)

The interference cancellation algorithm 928 generates an adaptive filter coefficient using the signal generated by the delay unit 924 using the reference signal and the output e (t) of the error calculator 920. At this time, the interference cancellation algorithm used may be a time domain or a frequency domain algorithm. That is, it is possible to use the LMS and LS series algorithms in the time domain and the FFT and DCT based algorithms in the frequency domain.

Claims

In a complex hull network consisting of one or more steel structures,

One or more ultrasonic terminals for exchanging data via ultrasonic communication; And

And an ultrasonic-ultrasound repeater for relaying communication of the at least one ultrasonic terminal.
The method of claim 1,

And an ultrasonic-wired repeater for transferring the data signal received through the ultrasonic terminal or the ultrasonic-ultrasonic repeater to a terminal connected by wire.
The method of claim 1,

The ultrasonic terminal,

A matching plate is attached to the front for optimal matching, and transmits and receives an ultrasonic transducer for transmitting and receiving an ultrasonic signal;

A transmitter / receiver for modulating and transmitting the ultrasonic signal at a rated frequency, demodulating and amplifying a signal received at a rated frequency, and converting the received ultrasonic signal into a digital signal; And

Ship hull communication network using ultrasonic waves, characterized in that it comprises a terminal for signal processing of the baseband.
The method of claim 1,

The ultrasonic-ultrasound repeater,

A matching plate is attached to the front for optimal matching, and two pairs of transmitting and receiving ultrasonic transducers for transmitting and receiving ultrasonic signals;

Two pairs of transmitting and receiving units for modulating and transmitting the ultrasonic signal at a rated frequency, demodulating and amplifying a signal received at the rated frequency, and converting the received ultrasonic signal into a digital signal; And

Compensating the attenuation of the ultrasonic signal proceeding in the hull, the hull communication network of the ship using an ultrasonic wave, characterized in that it comprises a controller for removing noise.
The method of claim 2,

The ultrasonic-wired repeater,

A matching plate is attached to the front for optimal matching, and transmits and receives an ultrasonic transducer for transmitting and receiving an ultrasonic signal;

A transmitter / receiver for modulating and transmitting the ultrasonic signal at a rated frequency, demodulating and amplifying a signal received at a rated frequency, and converting the received ultrasonic signal into a digital signal;

A controller for compensating for attenuation of the ultrasonic signal traveling in the hull and removing noise;

A signal converter for connecting the physical medium between the ultrasonic wave and the wired network; And

Ship's hull communication network using ultrasonic waves, characterized in that it comprises a wired port for transmitting the ultrasonic signal through the wire.
The method according to any one of claims 3 to 5,

The matching plate is a hull communication network using ultrasonic waves, characterized in that configured in the form corresponding to the hull surface for optimum impedance matching of the uneven hull.
In a communication method using ultrasonic waves in a complex hull composed of one or more steel structures,

Transmitting a communication from the ultrasonic terminal through an ultrasonic signal;

Determining whether there is an ultrasonic terminal that can be received through the medium of the hull;

Determining whether there is an ultrasonic-ultrasound repeater or an ultrasonic-wired repeater if the receivable ultrasonic terminal does not exist;

Transmitting a communication signal when a device capable of transmitting the ultrasonic signal exists;

Determining whether the terminal is to be finally delivered; And

And ending the transmission of the communication signal when the ultrasonic signal is transmitted to the final receiving terminal.
In a communication system using an ultrasonic transducer in the hull,

A multi-channel transmitter for preprocessing a data signal to be transmitted, converting the signal from serial to parallel, digitally modulating the encoded signal, and converting the amplified output signal into sound waves and transmitting it through the hull and air;

A multi-channel receiver for converting an ultrasonic signal received from the multi-channel transmitter into an electrical signal, converting the ultrasonic signal back into a digital signal, and serializing a parallel signal through a decoding process to reproduce an analog signal; And

And a relay device for amplifying a data signal transmitted from the multi-channel transmitter and transmitting the amplified data signal to the multi-channel receiver.
The method of claim 8,

And an interference canceling relay device for canceling interference of data signals transmitted from the multichannel transmission.
The method of claim 8,

The multi-channel transmitter,

A second sensor unit;

A second preprocessor for preprocessing the signal input from the second sensor unit;

A third A / D converter for converting the signal processed by the second preprocessor into a digital signal;

An S / P converter converting the serial signal converted by the third A / D converter in parallel;

A space-time encoder for encoding the signal converted by the S / P converter into a space-time code;

A modulator for modulating data generated by the space-time encoder;

A third D / A converter for converting the signal generated by the modulator into an analog signal;

At least one second ultrasonic amplifier for amplifying the signal generated by the third D / A converter; And

And at least one ultrasonic transducer for converting the electrical signal amplified by the second ultrasonic amplifier into an ultrasonic signal.
The method of claim 8,

The multi-channel receiver,

One or more ultrasonic transducers for converting ultrasonic signals passing through the hull and air channels into electrical signals;

At least one band filter unit for filtering the signal generated by the ultrasonic transducer into a signal having a desired band;

A fourth A / D converter for converting the signal generated by the band filter to a digital signal;

A demodulator for demodulating the digital signal generated by the fourth A / D converter;

A space-time decoder for performing spatio-temporal source decoding and space-time decoding on the signal generated by the demodulator;

An equalizer for removing the influence of a channel on the signal generated by the space-time decoder;

A P / S converter for converting the parallel signal generated by the space-time decoder into a serial;

A D / A converter for converting the converted digital signal into an analog signal; And

And a second reproducing unit for reproducing the signal in accordance with the purpose of the transmission signal.
The method of claim 8,

The relay device,

A multiple receive ultrasound transducer for converting the multiple receive ultrasound signals into electrical signals;

A simple relay unit comprising one or more simple amplification relay modules for amplifying an output signal of the multiple reception ultrasonic transducer; And

And a multiple transmission ultrasonic transducer for converting the output electrical signal of the simple relay into a sound wave signal.
The method of claim 12,

The simple amplification relay module of the simple relay unit,

A first AGC unit for adjusting a gain of an input signal;

A second band filter unit for filtering the output of the first AGC to a desired band;

A third ultrasonic amplifier for amplifying the output signal of the second band filter unit; And

And an AVC unit for adjusting an output voltage of the output of the third ultrasonic amplifier.
The method of claim 9,

The interference elimination relay device,

A multiple receive ultrasound transducer for converting the multiple receive ultrasound signals into electrical signals;

An interference canceling relay unit configured of one or more interference cancellation relay modules for canceling interference of an output signal of the multiple reception ultrasound transducer; And

And a multiple transmission ultrasonic transducer for converting the output electrical signal of the interference canceling relay unit into a sound wave signal.
The method of claim 14,

The interference cancellation relay module,

A second AGC unit for adjusting a magnitude of an input signal;

A fifth A / D converter for converting the output of the AGC unit to digital;

A third band filter unit for band filtering the output of the A / D converter;

An interference cancellation unit for removing interference from an output signal of the third band filter unit;

A fifth D / A converter converting the output signal of the interference canceller into an analog signal; And

And a fourth ultrasonic amplifier for amplifying the output signal of the fifth D / A converter.
The method of claim 15,

The interference cancellation unit,

An error calculator for calculating an input signal;

A fourth band filter unit for band filtering the error calculation unit output signal;

A delay unit for delaying an output signal of the band filter unit;

An adaptive filter unit for removing interference from the output signal of the delay unit through an adaptive filter:

And an interference cancellation algorithm unit for generating an adaptive filter coefficient using the output signal of the delay unit and the signal generated by the delay unit.