KR101538321B1 - Data transmission system of underwater sensor array for decreasing losing of data - Google Patents

Abstract

Provided is a data transmission system for minimizing a data loss if a failure in a signal transferring node of an underwater array sensor occurs. The signal transferring node comprises: a signal transferring portion; a digital circuit; an analog circuit; and a power supply portion. The digital circuit includes: a main control portion; a switch; and a subcontrol portion. By separating a control portion of the digital circuit, the data loss caused by a failure is prevented since the subcontrol portion controls and transfers a transferring route of received data if the failure occurs in the main control portion. In addition, a detecting performance of the underwater array sensor is improved due to a decrease of the data loss.

Description

TECHNICAL FIELD [0001] The present invention relates to a data transmission system for reducing data loss of an underwater array sensor,

The present invention relates to an implementation of a signal transmission node constituting a data transmission system of a sensor operating in water and a signal transmission method for detecting a failure occurring in the signal transmission node.

Unlike airborne radar equipment using high frequency band electromagnetic waves, SONAR (Sonar Navigation And Ranging) system is an underwater radar equipment that detects a target by using sound waves of low frequency band in water. Is an essential audio equipment. In the passive sonar system, the electric energy is generated through an underwater sensor composed of a ceramic or a crystal having a piezoelectric phenomenon by receiving a sound wave, so that the target that generates a sound wave can be detected by analyzing the frequency and the size of the electric signal.

In the past passive sonar system, the micro signal detected from the underwater sensor was transmitted to the signal processor in the receiver and the pre - processing and the digital conversion were carried out. In addition, in order to improve the detection capability, the configuration of the water sensor is composed of multiple channels and various arrangements, and the system configuration becomes complicated due to an increase in the number of cables and connectors.

In order to transmit the signals of the multi-channel underwater array sensor into the underwater cabin, various types of single transmission network structures such as a bus type and a ring type have been applied. However, in case of any signal transmission node failure, There is a problem that data of the signal transmission node is lost. In order to solve this problem, a dual transmission network structure such as a daisy-chain structure including a hopping scheme has been developed and applied. However, due to the complexity of the cable harness and the increase in space and cost, It is difficult to implement the sensor data transmission network. Also, even if the dual transmission network structure is used, if a continuous signal transmission node fails, data loss of all the signal transmission nodes constituting the transmission group becomes inevitable.

Accordingly, it is an object of the present invention to provide a data transmission system for preventing data loss due to a failure of a main control unit of a signal transmission node constituting a multi-channel underwater array sensor.

It is another object of the present invention to provide a data transmission system which can easily implement a sub-control unit for preventing data loss by controlling a transmission path of received data separately from a main control unit. And a data transmission system for preventing data loss due to a failure of a main control unit of a signal transmission node constituting a multi-channel underwater array sensor.

According to an aspect of the present invention, there is provided a data transmission system including a sensor for sensing a signal underwater, a digital circuit for forming data in which the sensed signal is converted, a signal transmission unit for transmitting and receiving the data, A first signal transmission node, a second signal transmission node and a third signal transmission node, each of which is connected in sequence to the digital circuit and the signal transmission unit, The digital circuit of the first signal transmission node generates merged data including data of the second signal transmission node when data is received from the first signal transmission node and transmits the merged data to the third signal transmission node A main control unit for controlling and controlling a transmission path of data received from the first signal transmission node to the main control unit, Controls the switch to shut off the transmission path of data received from the first signal transmission node to the main control unit when a failure of the main control unit is detected based on bidirectional communication with the switch and the main control unit, And a sub control unit for controlling the signal transmission unit to transmit data received from the first signal transmission node to the third signal transmission node.

The power supply unit may include a main power supply for supplying power to the main control unit, a sub power supply for maintaining the power output while the main control unit is receiving power from the main power supply, And a switching node for supplying power supplied from the sub power source to the sub control unit so that the sub control unit performs the bidirectional communication with the main control unit when a failure occurs in the main power supply.

The signal transmission unit of the second signal transmission node may include a reference reception unit and a spare reception unit receiving the data transmitted from the first signal transmission node and the data received by the reference reception unit within a predetermined reference time The main control unit forms the merged data together with the data of the second signal transmission node, and if the data transmitted from the first signal transmission node in the reference time is not received in the reference reception unit, And may combine the received data with the data of the second signal transmission node to form the merged data.

In addition, the sub-controller detects a failure of the main control unit and, if data is not received from the first signal transmission node within the reference time, transmits the data received by the preliminary reception unit to the third signal transmission node It is possible to control the signal transmission unit to transmit.

The main control unit of the second signal transmission node forms a data frame in which the data of the first signal transmission node and the data of the second signal transmission node are sequentially merged, The data of the second signal transmission node further includes failure information of the main control unit, the sub control unit, the switch, the signal transmission unit and the power supply unit included in each of the first signal transmission node and the second signal transmission node can do.

Even if the main control unit of the signal transmission node fails, the sub control unit transmits the received data to the next signal transmission node, thereby preventing the data loss due to the failure of the main control unit . Therefore, the detection performance of the underwater sensor is improved because the total data loss can be reduced.

FIG. 1A is a diagram illustrating a multifunctional signal transmission node according to an embodiment of the present invention.
1B is a diagram illustrating a sequential connection relationship of signal transmission nodes according to an exemplary embodiment of the present invention.
2 is a flowchart illustrating a method of controlling a transmission path by a sub control unit according to an exemplary embodiment of the present invention.
3A is a diagram showing a data transmission path when the main control unit operates normally according to an embodiment of the present invention.
3B is a diagram illustrating a data transmission path when a failure occurs in the main control unit according to the embodiment of the present invention.
4 is a diagram illustrating redundancy of a power supply unit according to an embodiment of the present invention.
5A is a diagram illustrating redundancy of a signal receiving unit according to an embodiment of the present invention.
5B is a flowchart illustrating a method of controlling a data transmission path according to whether an error occurs in a duplicated signal receiving unit according to an exemplary embodiment of the present invention.
6 is a diagram illustrating an entire data transmission system according to an embodiment of the present invention.
7 is a diagram illustrating a data frame transmitted according to an embodiment of the present invention.

In this specification, the same reference numerals are given to the same or similar embodiments, and the same reference numerals are given to similar components, and the description thereof is omitted for the first time. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. In this specification, "comprises" Or "include." Should not be construed to encompass the various components or steps described in the specification, and some of the components or portions may not be included, or may include additional components or steps And the like.

Further, the suffix "part" for a component used in the present specification is given or mixed in consideration of ease of specification, and does not have a meaning or role that is different from itself. Further, in the description of the technology disclosed in this specification, a detailed description of related arts will be omitted if it is determined that the gist of the technology disclosed in this specification may be obscured.

Hereinafter, a data transmission system according to the present invention will be described in detail with reference to the drawings.

The data transmission system according to the present invention multiplexes a signal transmission node so as to amplify a minute signal sensed by a sensor in the water and convert it into digital data before transmission. In addition, the transformed data is transmitted along a sequentially connected signal transmission node.

FIG. 1A is a diagram illustrating components included in a multi-functional signal transmission node, and FIG. 1B is a diagram illustrating a connection relationship in which the signal transmission nodes are sequentially connected.

1A and 1B, a second signal transmission node 200 may include a signal transmission unit 210, a digital circuit 220, an analog circuit 230, and a power supply unit 240. The signal transmission unit 210 is interconnected with the signal transmission unit 110 of the first signal transmission node 100 and the signal transmission unit 310 of the third signal transmission node 300. Although not shown in the figure, each of the first to third signal transmission nodes 100, 200, and 300 may include a plurality of magnetic sensors or acoustic sensors capable of sensing minute signals in the water. The signal transmission unit 210 receives data from the first signal transmission node 100 and transmits data to the third signal transmission node 300.

The analog circuit 230 amplifies the minute signal sensed by the sensor in a size easy to analyze. The signal processor receives information from a signal sensed by the sensor and detects or tracks a threatened underwater object. In addition, the analog circuit 230 converts the amplified signal into digital data for transmission.

The digital circuit 220 controls the signal transmission unit 210 and the analog circuit 230. The digital circuit 220 includes a main control unit 221, a switch 222, and a sub control unit 223.

The main control unit 221 controls the signal transmission unit 210 to receive data from the first signal transmission node 100. Also, the analog circuit 230 is controlled to convert a signal sensed by the sensor of the second signal transmission node 200 into digital data. The data received from the first signal transmission node 100 forms merged data by the main control unit 221 together with the data converted by the second signal transmission node 200. Also, the main control unit 221 controls the signal transmission unit 210 to transmit the merged data to the third signal transmission node 300.

The switch 222 connects or disconnects the transmission path of data received from the first signal transmission node 100 with the main control unit 221.

The main control unit 221 is connected to the main control unit 221 in order to block the connection of the data transmission path received from the first signal transmission node 100 and the main control unit 221 when a failure occurs in the main control unit 221, 222). And controls the signal transmission unit 210 to transmit the data received from the first signal transmission node 100 to the third signal transmission node 300.

A specific process of controlling the transmission path of the data received from the first signal transmission node 100 by the sub control unit 223 according to whether or not a fault occurs in the main control unit 221 will be described later.

The power supply unit 240 supplies power to the signal transfer unit 210, the digital circuit 220, and the analog circuit 230, respectively.

In the case of transmitting the fine signal sensed by the sensor without converting it into data, there is a problem of reliability reduction in analyzing a signal received due to the noise included in the transmission process. However, since the signals transmitted by the signal transmitting unit, the digital circuit, and the analog circuit are converted into data and transmitted to the signal transmitting node, the accuracy of the received data analysis is improved and the detection performance is improved It is effective.

Also, even if a failure occurs in the main control unit 221, since the data received from the first signal transmission node 100 is not lost and is transmitted to the third signal transmission node by the sub control unit 223, There is an effect that loss is reduced.

Hereinafter, a method of controlling the transmission path of data received from the first signal transmission node 100 by the sub control unit 223 according to the failure of the main control unit 221 will be described in detail.

Hereinafter, for convenience of description, the data received from the first signal transmission node 100 is defined as sensor data.

FIG. 2 is a flowchart for controlling the transmission path of the sensor data according to whether the main control unit 221 fails.

3A is a diagram showing a transmission path of the sensor data in the second signal transmission node 200 when the main control unit 221 is in a normal state (no failure has occurred), and FIG. And a transmission path of the sensor data in the second signal transmission node 200 when the control unit 221 is in a failure state.

Referring to FIGS. 2 and 3A, the second signal transmission node 200 receives sensor data (S1).

The sensor data may be data in which a signal sensed by the sensor of the first signal transmission node 100 is converted. In other words. The sensor included in the first signal transmission node 100 detects a signal from underwater, and the sensed signal is converted into digital data by the analog circuit included in the first signal transmission node 100. In addition, the data received from the first signal transmission node 100 may include failure information such as a digital circuit or an analog circuit included in the first signal transmission node 100. The information that the data can include will be described later with reference to Fig.

While the sensor data is received, the main control unit 221 and the sub control unit 223 perform bidirectional communication (S2).

Specifically, the sub control unit 223 transmits the communication to the main control unit 221 and checks the status of the main control unit 221 based on whether the main control unit 221 responds to the communication within a predetermined time . For example, when the main control unit 221 responds to the communication within a predetermined time in communication performed by the sub control unit 223, the sub control unit 223 recognizes that the main control unit 221 is in a normal state do.

The switch 222 includes a first node 222a located close to the receiving section of the signal transmitting section 210, a second node 222b located close to the main controlling section 221, Lt; RTI ID = 0.0 > 222c < / RTI >

The second node 222b of the switch 222 is set to be connected to the third node 222c when the main control unit 221 is in a normal state. When the sub control unit 223 recognizes the steady state of the main control unit 221, the control unit 223 notifies the switch 222 that no signal is present so that the connection between the second node 222b and the third node 222c is maintained The sensor data is received by the main control unit 221, and the main control unit 221 merges the sensor data and the data converted by the analog circuit 230 (S3).

 The merged data is transmitted to the third signal transmission node 300 through a transmission path to which the second node 222b of the switch 222 and the third node 222c are connected (S4).

2 and 3B, when the main control unit 221 does not respond to the communication of the sub control unit 223 within a predetermined time, the sub control unit 223 determines that the main control unit 221 has failed Is recognized.

When the main control unit 221 is recognized as a failure state, the sub control unit 223 controls the switch 222 so that the third node 222c of the switch 222 is connected to the first node 222a And transmits the signal 223a to the main node 221. When the third node 222c and the first node 222a are connected by the signal 223a, the sensor data is not received by the main controller 221. [ That is, the main control unit 221 and the transmission path of the sensor data are disconnected (S5).

Since the sensor data is not received by the main control unit 221, the sensor data is transmitted to the third signal transmission node 300 without forming merge data including the data of the second signal transmission node 200 (S6) . In this way, even if a failure occurs in the main control unit 221, the sub control unit 223 controls the switch 222 so that the sensor data can be transmitted without being lost.

In addition, the sub-control unit 223 transmits the signal 223a to the switch 222 without controlling the signal transmission path of the sensor data by a complicated algorithm or code, thereby preventing data loss. Do. On the other hand, when the power supplied from the power supply unit 240 is cut off, the main control unit is not driven.

Therefore, a method of driving the data transmission system in the event of a failure of the power supply unit 240 will be described in detail below.

4 is a diagram showing a power supply unit 240 including a main power supply 241, a sub power supply 242, and switching nodes 240a and 240b.

4, the power supply unit 240 includes a main power supply 241 and a sub power supply 242 switching nodes 240a and 240b. The switching node includes a first switching node 240a and a second switching node 240b. Node 240b.

The main power supply 241 supplies power to the main control unit 221, the analog circuit 230 and the first switching node 240a.

The secondary power supply 242 provides power to the second switching node 240b.

The first and second switching nodes 240a and 240b receive power from the main power source 241 and the sub power source 242 and are connected to the switch 222, And selects the power to be supplied to the sub control unit 223 and the signal transmission unit 210. That is, when the main power is in a normal state (no failure has occurred), the first and second switching nodes 240a and 240b are turned on by the switches 222, And supplies the power supplied from the main power supply 241 to the sub control unit 223 and the signal transmission unit 210. However, when the main power supply 241 is in a failure state (failure has occurred), the power supplied from the main power supply 241 is cut off. The power of the sub power source 242 maintains an output even if the state of the main power source 241 is changed and the first and second switching nodes 240a and 240b maintain the output power of the sub power source 242 To the switch 222, the sub control unit 223, and the signal transfer unit 210. [

The first and second switching nodes 240a and 240b may be configured as diodes and the process of selecting the power provided by the first and second switching nodes 240a and 240b is automatically performed without any control . That is, when the power provided from the main power source 241 is cut off, the first and second switching nodes 240a and 240b automatically supply power supplied from the sub power source 242. [

As shown in the drawing, the main control unit 221 receives power only from the main power supply 241, so that when the power of the main power supply 241 is cut off, the main control unit 221 is not driven . However, even if the power supplied from the main power supply 241 is cut off, the sub control unit 223 receives the power supplied from the sub power supply 242 from the second switching node 240b. Accordingly, the sub-control unit 223 can continue to operate and can perform bi-directional communication with the main control unit 221.

The main control unit 221 can receive the power of the sub power source 242 from the second switching node 240b even if the power supplied from the main power source 241 is cut off, Directional communication with the base station. Therefore, it is possible to control the transmission path of the sensor data by recognizing the failure of the main control unit 221 which is not operating.

The main power supply 241 and the sub power supply 242 are included in the power supply unit 240 so that the sensor data loss by the sub control unit 223 can be prevented without any hardware implementation.

Data loss problems can also occur if the network is lost. Therefore, the dual network structure and the data transmission system in the dual communication network will be examined in connection with the communication network loss.

FIG. 5A is a diagram illustrating a double-divided receiving unit in the signal transmitting unit 210, and FIG. 5B is a flowchart illustrating a process in which data is transmitted when a failure occurs in any one of the dual receiving units.

Referring to FIGS. 1B and 5A, the reference receiver 211a and the spare receiver 211b receive sensor data from the first signal transmission node 100, respectively. The first signal transmission node 100 transmits the same sensor data to the reference reception unit 211a and the spare reception unit 211b, respectively. However, since the sensor data is transmitted at a high speed, an error may occur in the transmission process. Therefore, the sensor data received by the reference receiving unit 211a and the preliminary receiving unit 211b are not the same.

The main control unit 221 selects which sensor data to include in the received sensor data to form the merged data. In this case, the sensor data that is preferentially selected becomes the sensor data received by the reference receiving unit 211a. That is, the sensor data received by the preliminary receiving unit 211b is included in the merge data only when a failure occurs in the reference receiving unit 211a.

Hereinafter, a data transmission process when a failure occurs in the reference reception unit 211a and the transmission network is lost will be described with reference to FIG. 5B.

When the sensor data is received, the sub control unit 223 senses the state of the main control unit 221 through bidirectional communication (S11).

When the main control unit 221 is in a normal state (no failure has occurred), the main control unit 221 controls the reference reception unit 211a and the spare reception unit 211b to receive the sensor data S12).

When the sensor data is received within the predetermined reference time in the reference reception unit 211a, the main control unit 221 recognizes that the reference reception unit 211a is in a normal state (no failure has occurred).

Accordingly, the main control unit 221 controls the transmission unit 212 to transmit the merged data formed using the sensor data received by the reference reception unit 211a to the third signal transmission node 300 (S13) .

 However, if the sensor data is not received during the reference time in the reference reception unit 211a, the main control unit 221 recognizes that the reference reception unit 211a is in a failure state (a failure occurs). That is, the main control unit 221 controls the transmission unit 212 to transmit the merged data including the sensor data received by the preliminary reception unit 211b to the third signal transmission node 300 (S14).

On the other hand, when a failure occurs simultaneously in the reference reception unit 211a and the main control unit 221, there is a problem in data transmission.

When the sub control unit 223 recognizes the failure of the main control unit 221 in the bidirectional communication, the reference receiving unit 211a and the spare receiving unit 211b receive the sensor data (S15).

If the sensor data is not received during the reference time in the reference reception unit 211a, the sub-control unit 223 recognizes that the reference reception unit 211a is in a failure state. The sub control unit 223 controls the transmission unit 212 to transmit the sensor data received in the preliminary reception unit 211b to the third signal transmission node 300 in step S16.

If the failure occurs in the reference reception unit 211a even if the main control unit 221 fails, the sub-control unit 223 transmits the sensor data received in the reference reception unit 211a to the third signal transmission unit And controls the transmitting unit 212 to transmit to the node 300 (S7).

 If a network loss occurs due to a failure of a receiving unit in a single transmission network, the entire data transmission itself is blocked. However, it is possible to overcome the problem that the whole data is lost through the transmission of the received data to the receiving unit in which the failure does not occur even if a failure occurs in any one receiving unit by duplicating the receiving unit.

Also, even if the network loss and the failure of the main control unit 221 occur at the same time, the sub-control unit 223 recognizes the failure of the reference reception unit 211a and controls the sensor data transmission, Can be minimized.

Hereinafter, a structure of an entire data transmission system capable of improving detection performance according to the ultimate purpose of the present invention will be described.

6 is a diagram illustrating a structure of an entire data transmission system including a transmission group formed by sequentially connecting a plurality of signal transmission nodes.

6, an overall data transmission system 600 includes a signal processor 650, which is arranged in a plurality of transmission groups 610, 620, 630 and connected to a sensor signal receiver 640, Is configured to transmit and receive data to and from the sensor signal receiver (640).

The transmission group 610 includes a plurality of signal transmission nodes 611, 612, and 613 sequentially connected, and the signal transmission nodes 611, 612, and 613 form individual channels. The channel is a component required to detect a minute signal from the water in real time at various angles. That is, when each signal transmission node is sequentially connected, a multi-channel underwater sensor is implemented.

In addition, the signal transmission nodes 611, 612, and 613 can be configured to be compatible with each other through a channel change. For example, when the first signal transmission node is sequentially connected to the fifth signal transmission node, even if the positions of the first signal transmission node and the fifth signal transmission node are interchanged, The data is the same as before the location was exchanged.

Each of the transmission groups 610, 620, and 630 is independently connected to the sensor signal receiver 640. That is, even if a failure occurs in one of the transmission groups, the other transmission groups are not affected.

The sensor signal receiver 640 includes a signal transmitter 642 for transmitting and receiving data to and from each of the transmission groups 610, 620 and 630, a power supply unit 643 for supplying power to each of the transmission groups, And a controller 641 for controlling the power supply unit 643 and the power supply unit 643.

Specifically, the signal transmission unit 642 may be divided into a plurality of transmission units 642a, 642b, and 642c, and the power supply unit 643 may be divided into a plurality of power units 643a, 643b, and 643c .

Each of the transmission units 642a, 642b, and 642c is connected to each of the transmission groups 610, 620, and 630 to form a data transmission line for transmitting and receiving data. For example, the one transmission group 610 includes a plurality of signal transmission nodes 611, 612, and 613 sequentially connected, and the plurality of signal transmission nodes 611, 612, A signal transmission unit included in the signal transmission node is connected to transmit and receive data. Each of the signal transmission units is connected to form a first line and the formed first line forms a data transmission line together with the sensor signal receiver 642a and the second line to which the transmission group 610 is connected.

Each of the power supply units 643a, 643b, and 643c is connected to each of the transmission groups 610, 620, and 630 to form a power supply line. As with the data transmission line, the power supply units 643a, 643b, and 643c form a line that supplies power to each power supply unit included in the plurality of signal transmission nodes in each of the transmission groups 610, 620, and 630 do. A plurality of signal transmission nodes included in each of the transmission groups 610, 620, and 630 sequentially merges the converted data of the signals sensed by the respective sensors and transmits the combined data to the sensor signal receiver 640. A method in which the transformed data are sequentially merged will be described later. The sensor signal receiver 640 rearranges data received from a plurality of transmission groups in the order recognized by the controller 641 of the sensor signal receiver to form final data and transmits the data to the signal processor 650 do. The sensor signal receiver 640 transmits control commands transmitted from the signal processor 650 to the transmission groups 610, 620, and 630, respectively. The control commands are transmitted along signal transmission nodes sequentially connected in the respective transmission groups 610, 620 and 630.

The signal processor 650 detects and tracks an underwater object through analysis of data received from the signal transmission nodes and received through the sensor signal receiver 640.

The data transmission system 600 is formed in such a structure that data of other transmission groups is not lost even if any transmission group data is lost. In addition, by separating the data transmission line and the power supply line, even if one line fails, the other line is not affected.

 Therefore, the total data loss is minimized and the detection performance is improved.

Meanwhile, the final data received from the sensor signal receiver 640 includes failure information regarding each of the transmission groups 310, 620, and 630 and the signal transmission nodes included in the respective transmission groups. It is possible to determine which structure has failed. Hereinafter, a method of identifying the type of failure through data analysis will be described.

In addition to implementing structures to identify faults, you can also identify fault types through data analysis.

7 is a diagram showing data transmitted and received by each signal transmission node in a frame format.

The data 710 of the signal transmission node includes failure information data 712 including data 711 sensed by the sensor of the signal transmission node and failure information of each component included in the signal transmission node.

The data 710 is sequentially connected to the next signal transmission node, and the signal transmission node receiving the data 710 forms a merged data frame including the data 710.

A process of sequentially forming the merged data frames will be described with reference to FIG. The second signal transmission node 200 receives data from the first signal transmission node 100. The data received from the first signal transmission node 100 includes data sensed by the sensor of the first signal transmission node 100 and failure information data of the first signal transmission node 100. [ The main control unit of the second signal transmission node 200 transmits the data sensed by the sensor of the second signal transmission node 200 and the failure information data of the second signal transmission node 200 to the first signal transmission node 100, The merged data frame 700 is repeated in each of the sequentially connected signaling nodes, and the signal processor 700 finally receives the merged data frame 700.

Therefore, each section of the last data frame 700 includes a data frame 710 of the signal transmission node corresponding to that section. Specifically, the final data frame 700 is divided into a plurality of sections, and data frames of the signal transmission nodes sequentially connected to the respective sections are included in positions corresponding to the sections.

In addition, the failure information data 712 included in the data 710 is divided into sections corresponding to the respective components such as the signal transmission unit, the main control unit, and the sub control unit included in the signal transmission node. For example, when a failure occurs in the power supply unit, failure information of the power supply unit is included in a section corresponding to the power supply unit within the failure information data 712. If a failure occurs in the main control unit, merging data formation is not possible in the signal transmission node including the main control unit, so that the data interval corresponding to the signal transmission node is empty in the last data frame.

Therefore, the signal processor can determine whether a component included in a signal transmission node has a failure by analyzing a segment of the last data frame 700 transmitted.

Also, in the data transmission system including a plurality of transmission groups as described above, the sensor signal receiver rearranges the received data in the order of the transmission groups recognized by the controller included in the sensor signal receiver. That is, they are rearranged according to the order recognized by the controller of the sensor signal receiver after they are received regardless of the received time order. Accordingly, the signal processor can analyze which transmission group has failed through the analysis of the rearranged data frame.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (5)

A sensor for sensing a signal in the water, a digital circuit for forming the converted data of the sensed signal, a signal transmitter for transmitting and receiving the data, and a power supply for supplying power to the sensor, the digital circuit and the signal transmitter A first signal transmission node, a second signal transmission node, and a third signal transmission node,
Wherein the digital circuit of the second signal transmission node comprises:
A main control unit for forming merged data including data of the second signal transmission node when data is received from the first signal transmission node and controlling the signal transmission unit to transmit the merged data to the third signal transmission node;
A switch for connecting or disconnecting a transmission path of data received from the first signal transmission node with the main control unit; And
Controls the switch to block the transmission path of data received from the first signal transmission node from the main control unit when a failure of the main control unit is detected based on bidirectional communication with the main control unit, And a sub-control unit for controlling the signal transmission unit to transmit data received from the node to the third signal transmission node. The method according to claim 1,
The power supply unit,
A main power supply for supplying power to the main control unit;
A sub power source for maintaining an output so that the sub control unit performs bidirectional communication with the main control unit; And
And a controller for receiving power supplied from the main power supply and the sub power supply at the same time as the power supply lines of the main power and the sub power and receiving power supplied from the sub power supply only when a failure occurs in the main power, A switch and a switching node for supplying the switch and the signal transmission unit. The method according to claim 1,
Wherein the signal transmission unit of the second signal transmission node comprises:
A reference reception unit and a spare reception unit, each receiving data transmitted from the first signal transmission node,
Wherein the data received by the reference receiver in a predetermined reference time forms the merged data by the main controller together with the data of the second signal transmission node,
Wherein the main control unit forms the merged data together with the data of the second signal transmission node in the data received by the preliminary reception unit if the reference reception unit does not receive data from the first signal transmission node within the reference time Characterized by a data transmission system. The method of claim 3,
The sub control unit detects a failure of the main control unit and transmits data received by the spare reception unit to the third signal transmission node if the reference reception unit does not receive data from the first signal transmission node within the reference time And controls the signal transmission unit. The method according to claim 1,
Wherein the data of the second signal transmission node comprises:
Data including fault information generated in the main control unit, the sub control unit, the switch, the signal transmission unit, and the power supply unit included in the second signal transmission node and data sensed by the sensor of the second signal transmission node are connected Wherein the data frame is a data frame.

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