KR101021863B1 - Protocol integration system for the ship electronic device - Google Patents

Abstract

PURPOSE: A protocol integration system for a ship electronic device is provided to improve the efficiency of an entire ship system by constructing an integrated single communication network with regard to all ship electronic devices. CONSTITUTION: An effective information extracting module receives a signal from a ship electronic device(110). The effective information extracting module extracts information except for a reserved character and a header. A standard protocol combination module combines the information extracted from the effective information extracting module with a standard protocol type. The standard protocol combination module transmits the information data of the standard protocol type to an automatic navigation device(130). The effective information extracting module extracts the information data by extracting the information data and determining the effective data.

Description

Protocol Integration System for the Ship Electronic Device

The present invention relates to a ship, and more particularly, to a ship electronic device protocol integration system capable of converting signals output from various ship electronic devices into the same format that can be identified by the auto navigation device and transmitting the same to the auto navigation device.

In order to safely and accurately guide large moving objects such as ships, aircraft, or satellites to their destinations, high-precision position control sensors or navigational devices are required. As a navigation system that provides the ship's bearing information, gyro compasses representing the true north, magnetic compasses pointing to the north, and GPS are used. It is. However, these ship electronic devices are using different signal formats, and the efficiency and maintainability of the entire ship system are greatly reduced.

In order to solve these problems, it is necessary to develop a protocol system capable of converting signals having different formats output from various ship electronic devices into the same format. When such a protocol system is developed, various additional services such as flight management service, safety monitoring service, and asset management service can be implemented based on the construction of a single integrated communication network of a ship.

Many large projects have been actively undertaken recently by the EU and maritime developed countries to implement standardized ship communication protocols, among which NMEA-0183 and NMEA-2000, established by the National Maritime Electronics Association (NMEA), are now international standards. Is being used. The NMEA-0183 is a 4,800bps single talker, single listener serial data communication that transmits data in a serial asynchronous fashion. As the number of connected nodes and data throughput increases, the newly established NMEA-2000 is a multi-talker, multi-listener, single channel parallel bus and has a communication speed of 250kbps at an effective distance of 200 meters. The NMEA-2000 network consists of four layers: physical layer, data link layer, network layer, network management layer, and application layer.

On the other hand, due to the different signal formats output from these ship electronic devices, in the existing system, azimuth, magnetic compass, or azimuth signals output from GPS can be used for automatic navigation device (APS), ship automatic identification device (AIS), navigation recording device. (VDR), radar, etc. (hereinafter referred to as 'automatic navigation device', including all of them), each device must be directly connected one-to-one, and a separate application for each signal processing inside the device Since programs must be embedded, problems such as an increase in communication ports, an increase in data processing burden, and design complexity are occurring.

Accordingly, an object of the present invention is to provide a marine electronic device protocol integration system which is capable of transmitting the output signals of different marine electronic devices to the same standard format and transmitting them to the automatic navigation device. There is this.

In order to achieve the above object, the ship electronic device protocol integration system according to the present invention is a protocol integration system that can convert the signal output from the ship electronic device into a format that can be identified by the automatic navigation device and transmit it to the automatic navigation device. A valid information extraction module for receiving a signal from the ship electronic device and extracting information data excluding a header and a reserved character; And a standard protocol combination module configured to combine the information data extracted by the valid information extraction module into a standard protocol format and transmit the combined information data to the automatic navigation device, wherein the valid information extraction module comprises: receiving a signal from a ship electronic device; Checking a header type in the received signal; Determining the string length of the signal; Classifying reserved characters; The method may extract information data by determining whether valid data is obtained through comparison of character counter values, and extracting information data.

On the other hand, in order to achieve the above object, the ship electronic device protocol integrated system according to the present invention, a protocol that can convert the signal output from the ship electronic device into a format that can be identified by the automatic navigation device to transmit to the automatic navigation device An integrated system, comprising: a valid information extraction module for receiving a signal from a ship electronic device and extracting information data excluding a header and a reserved character; And a standard protocol combination module configured to combine the information data extracted from the valid information extraction module into a standard protocol format and transmit the information data to the automatic navigation device, and separately to the automatic navigation device to operate independently of the protocol integration system. It is characterized by connecting the E-compass sensor which is a subsystem by adding the communication port.

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According to the present invention, an integrated single communication network for all ship electronic devices has the advantage of greatly improving the efficiency of the entire ship system in terms of system operation and management.

In other words, the automatic navigation system can use this data regardless of any vessel electronic device having a different output signal format, and can reduce the data processing burden incurred by the automatic navigation system in processing the signals directly. The design of the automatic navigation system is easy because there is no need to add a separate application for signal processing. In addition, since all signals can be received through one port, resource waste of the communication port can be prevented, and the cost of using multiple ports can be reduced.

In addition, when there are a plurality of ship electronic devices, by applying a multi-threading method, signals input from the ship electronic device may be simultaneously processed to improve data throughput of the system.

In addition, a separate communication port can be added to the automatic navigation system to operate independently of the protocol integration system to connect the E-compass sensor, which is a subsystem, to use the data of the E-compass sensor in the event of a protocol integration system failure. have.

1 is a network conceptual diagram of a protocol integration system according to the present invention;
2 is a block diagram of a protocol integration system according to the present invention.
3 is a standard protocol format according to the present invention.
4 is a flowchart illustrating a process of extracting information data in the valid information extraction module according to the present invention.
5 illustrates a multithreading implementation in accordance with the present invention.
6 is a comparison diagram of the ship communication protocol.
7 is a program screen configuration example.
8 is a program showing classification and signal data extraction for each signal header.
9 is a protocol integration system operation algorithm.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, in the present invention, both NMEA-0183 and NMEA-2000 are currently used as international standards, but since the NMEA-2000 is not widely used in ship systems, it is assumed that the NMEA-0183 standard is used.

1 is a conceptual diagram of a network of a protocol integration system according to the present invention, FIG. 2 is a block diagram of a protocol integration system according to the present invention, FIG. 3 is a standard protocol format according to the present invention, and FIG. 4 is a valid information extraction module according to the present invention. Is a flow chart illustrating a process of extracting information data in a.

As shown in the figure, the ship electronic device protocol integration system 120 according to the present invention to convert the output signal of the different ship electronic device 110 to the same one standard format to be transmitted to the automatic navigation device 130 It is composed. That is, the signals output from various ship electronic devices 110, such as gyro compass, magnetic compass, GPS, and other NMEA devices, are converted into the same format that the automatic navigation device 130 can identify to the automatic navigation device 130. It is to perform the role of transmitting.

In detail, the ship electronic device protocol integration system 120 according to the present invention receives a signal from the ship electronic device 110 and extracts the information data from the valid information extraction module 121 and the valid information extraction module 121. And a standard protocol combination module 122 for combining the extracted information data into a standard protocol format and transmitting the extracted information data to the automatic navigation device 130.

That is, the valid information extraction module 121 receives signals from each ship electronic device 110 in order to implement data transmission between ship devices having different signal formats, and removes unnecessary signals such as headers and reserved letters from each signal. It extracts only necessary information data except information. In addition, the standard protocol combination module 122 combines the information data extracted from the valid information extraction module 121 into a standard protocol format designed as shown in FIG. 3 and transmits the data to the automatic navigation device 130. To perform.

For example, standard protocols can be designed in HDT standard sentence format that includes Heading, Degrees true data, and HDG standard sentence format that includes Heading, Deviation, and Variation data.

However, it is possible to modify the format of the standard protocol according to the protocol format of the corresponding ship electronic device 110 in order to secure versatility for various ship electronic devices 110 other than the automatic navigation device 130 for example in the present specification. It is desirable to design to. Therefore, even if the applied device is changed, a unique function can be implemented as it is only by modifying the standard protocol combination.

Meanwhile, in the present invention, it is preferable to receive signals from the ship electronic devices 110 and transmit them to the automatic navigation device 130 using RS-232 serial communication which is used as a standard for various interfaces for communication in a PC. .

This is because parallel communication is difficult and expensive to implement compared with serial communication, and there is a limitation in communication distance. In particular, since the transmission of the NMEA signal is made in a serial communication method, the protocol integrated system 120 should also receive a signal in RS-232, which is a serial communication method, and RS-232 even when transmitting data extracted from the protocol integrated system 120. This can be used to unify the interface of the entire system. The uniformity of this interface may improve the interoperability between the protocol integration system 120 and the ship electronic device 110 or the automatic navigation device 130.

Specifically, the process of extracting the information data from the valid information extraction module 121 will be described with reference to FIG. 4.

First, a signal is received from the ship electronic device 110, and the header type is checked from the received signal (S110) (S120). Since each signal has a different format according to the header, signals are classified by header type for accurate information data extraction.

Subsequently, the string length of the signal is determined (S130). In the case of the standard sentence of NMEA-0183, up to 82 characters can be defined, and if the length of the entire string is greater than 82 in this process, it is determined that it is not a valid signal and receives a signal from the ship electronic device 110 again.

Next, unnecessary reserved characters such as comma (,) and asterisk (*) are classified (S140). Here, the reserved character means a character defined to distinguish each field from the beginning and the end of the NMEA standard sentence, and these reserved characters do not include specific information required by the system, and thus are separately used in the input signal separation process. To classify.

Finally, it is determined whether valid data is obtained by comparing character counter values, and information data is extracted (S150). That is, if the reserved character counter is compared with the character counter and the value of the reserved character counter is equal to the value of the character counter, the variable is set to NULL or “” without judging the string as valid data, and the value of the reserved character counter is set to the character counter. If it is larger than the value of the counter, the character string is judged as valid data, and the data from the character 'counter value' to the value of the reserved character counter-1 'is separated.

When the above process is finished, increase the value of the character counter by 1, compare the value of the incremented character counter again, and finish extraction of the information data if the signal is over, and if the signal is not over yet, The same reserved character classification and information data extraction process is repeated.

Meanwhile, when there are a plurality of ship electronic devices 110, it is preferable to allocate one thread for each ship electronic device 110 by applying a multi-threading method. As a result, signals input from the plurality of ship electronic devices 110 can be processed simultaneously to improve the data throughput of the system.

More specifically, the multithreading concept applied to the present invention will be described.

Multi-tasking and multi-threading are similar concepts, but multitasking means that two or more different applications are running at the same time, and multi-threading means more than one task in a single application. Means they are running at the same time.

The advantages of multithreading can be largely defined by four factors: responsiveness, resource sharing, economics, and multiprocessor utilization.

When multithreading is used in an interactive program, the program continues to run even if a portion of the program is interrupted or a long task is performed, thereby increasing the responsiveness to the user.

Also, unlike processes, threads can easily share resources such as code, data, and files, so multithreading makes it easy to share these resources.

Also, while process creation is expensive in memory and resource allocation, thread creation is much more economical because it shares the resources of the process to which it belongs.

Finally, using multithreading in a multiprocessor architecture improves parallelism and concurrency because each thread can run in parallel in different processes.

In the present invention, three threads may be used to simultaneously process signals input from a plurality of ship electronic devices 110, for example, a gyro compass, a magnetic compass, and a GPS.

When building a system using a single thread, if multiple clients simultaneously request processing, the problem is that the remaining clients wait indefinitely while processing a request from one client.

In other words, when signals are simultaneously input from gyro compass, magnetic compass, and GPS, the input signals of the other two devices cannot be processed until the input signal processing of one device is finished, and the input signals are not used in the system. It can't be thrown away.

In order to solve this problem, the present invention assigns one thread to each ship electronic device 110 by applying a multi-threading scheme. Unlike the single-threading method in which the input signals during the waiting time are discarded, the multi-threading method can improve the data throughput of the system because the input signals can be processed simultaneously.

In addition, in the present invention, an additional communication port may be added to the automatic navigation device 130 so as to operate independently of the protocol integration system 120 to connect an E-compass sensor which is a subsystem.

More specifically, the concept of constructing a subsystem applied to the present invention will be described.

The automatic navigation device 130 is a device that enables the ship to be operated more safely while reducing the navigation distance in consideration of various constraints on the ship operation.

The main function of the automatic navigation device 130 is to control the rudder automatically for the set target direction so as to keep the course of the ship constant and perform safe navigation. In order to perform this unique function, the automatic navigation device 130 uses data output from various ship electronic devices 110.

However, since the automatic navigation device 130 uses only the data of the protocol integration system 120, it cannot perform its own function when a failure occurs in the protocol integration system 120.

In order to solve this problem, an additional communication port is added to the automatic navigation device 130 to connect the E-compass sensor and operate independently of the protocol integration system 120. The system operating method may give priority to a program to use data of the protocol integrated system 120 during normal operation, and to use data of an E-compass sensor, which is a subsystem, in case of a failure.

Now, the present invention will be described in more detail with reference to Examples.

6 is a comparison diagram of a ship communication protocol, FIG. 7 is a program screen configuration example, FIG. 8 is a program showing classification and signal data extraction for each signal header, and FIG. 9 is a protocol integration system operation algorithm.

FIG. 6 compares the structure of protocols applied to ship communication. In the present invention, a system is implemented by applying NMEA-0183, which is currently most commonly used for ship communication.

NMEA-0183 is a protocol for the smooth communication of ship electronics, navigation equipment, and communication equipment through an appropriate interface. It is a single talker, single listener serial data communication of 4,800bps.It is serial asynchronous according to the National Standards Institute (ANSI) standard. To transmit data. The parity bit is not used, the first bit is the start bit, the next 8 bits are the data bits, and the last bit consists of the stop bits.

In the present invention, the NMEA-0183 data is composed of records called sentences, and the communication method uses RS-232, which is serial communication. The standard sentences of NMEA-0183 are all printable ASCII characters and can be up to 82 characters long. Each statement starts with "$" followed by a sender ID (two characters), data ID (three characters), and comma-separated data fields. Optional checksums can be added and finally a carriage return. Terminate with / line feed (CR / LF). All fields of the character are separated by commas and the first field is the Address Field. Data fields that do not have an exact value are left blank, and commas can occur consecutively. The checksum is the exclusive-or result of all characters except "*". Sentences in NMEA-0183 must follow the standard form, but are not mandatory and may define their own sentence forms at the discretion of the equipment manufacturer. The unique sentence starts with "$ P" followed by the manufacturer ID (three characters), followed by the manufacturer's data and the general sentence format.

FIG. 7 is a main form of a protocol system for extracting data transmitted from each ship device by type to check contents and output information data on a PC screen so as to determine whether the data is processed normally without errors.

The data displayed on the main form are extracted from gyro compass, magnetic compass, and GPS signal, and are configured to be displayed separately for each header type. The communication configuration section at the top of the main form allows you to select the type of device you are using, the communication port, communication speed, data bits, and parity.

GPS and gyro signals consist of four different headers each. Since signals have different formats according to headers, it is necessary to first classify signals according to header types in order to extract accurate information data. When the signal is classified, the header and reserved characters are removed and the information data is extracted. This process is implemented in four parts according to the signal format of each header. 8 is a code classifying a signal for each header and extracting information data. Although the configuration of the code is different depending on the signal format for each header, the function plays the following role in common.

The operation of the protocol integration system will be described with reference to FIG. 9.

First, when a signal is input, the program first checks the type of the header (S210) (S220). The GPS headers used in the present invention are four types of GPRMC, GPGSV, GPGSA, and GPGGA, and the gyro is also composed of four types of HEHDT, APHDG, APHTD, and APHTC.

The GPRMC of the GPS signal contains information such as time, latitude, longitude, altitude, system failure, speed, route and date. GPGSV includes the number of satellites used, information about the satellite number, altitude, azimuth, and signal-to-noise ratio, as well as the number of satellites used and the accuracy of the measurements. Finally, GPGGA is a fix data that includes information such as time, longitude, latitude, altitude, system quality, and number of satellites used.

The HDT (Heading True) header and the HDG (Heading Deviation Variation) header of the gyro signal have azimuth and bow azimuth information, and azimuth, deviation, and deviation information, respectively.

If a signal with a header other than the eight types mentioned above is input, it is regarded as not a GPS or gyro signal and is input again.

After checking the header, it is determined whether the total string length of the signal is smaller than 83 (S230). Since the standard sentence of NMEA-0183 can be defined up to 82 characters, if the total string length is greater than 82 in this process, it is determined that it is not a valid signal and fed back to step S210, and if it is less than 82, the next character counter (fi_char_counter) Set the initial value of to 7 (S240). Here, the character counter is set to 7 because the first to fifth characters of the NMEA signal are headers, and the sixth character is a reserved character comma, so the valid data to be extracted from the program starts with the seventh character. to be.

Next, unnecessary reserved characters are classified (S250). NMEA-0183 reserved characters that can be used in the standard sentence are '$' or '!' For the beginning of the sentence, '<CR>' and '<LF>' for the end of the sentence, and ' ',' And '*' for checksum fields are representatively used. In addition, to represent undefined characters, you can use ‘^’ to represent two-digit ASCII characters.

In this system, two counters are used to classify unnecessary reserved characters in each signal and to effectively separate valid data by field. To sort reserved characters, compare the reserved character counter with the character counter, and if the value of the reserved character counter is equal to the value of the character counter, set the variable to Null or “” without considering it as a data string, and set the value of the reserved character counter. If it is greater than the value of this character counter, the data string is considered valid and data is obtained from the value of the character counter to the value of the reserved character counter minus one.

Next, when the classification process of the reserved character is finished, the value of the character counter is increased by one (S260).

Finally, the value of the incremented character counter is compared again to determine whether the signal is terminated (S270). If the signal is finished, if the program is finished and the signal is not finished yet, the process returns to step S250 to classify the reserved characters and to increase the character counter value by one until the end.

When the ship electronic device protocol integrated system according to the present invention is applied to a ship system, since the transmission is made through one communication port without having to directly connect each device one-to-one, it is possible to solve the problem of increasing the communication port, Signals can be used without the burden of data processing through a separate application program, thereby solving the problem of weighting of data processing and design complexity. In addition, the implementation using software has the advantage that it can be easily introduced into existing ship system without expensive hardware.

On the other hand, although the marine electronic device protocol integration system according to the present invention has been described according to a limited embodiment, the scope of the present invention is not limited to the specific embodiment, the scope obvious to those of ordinary skill in the art related to the present invention Various alternatives, modifications and changes can be made within the implementation.

Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

110: ship electronic device 120: protocol integrated system
121: valid information extraction module 122: standard protocol combination module
130: automatic navigation device

Claims (5)

delete delete A protocol integrated system 120 capable of converting a signal output from the ship electronic device 110 into a format that can be identified by the automatic navigation device 130 and transmitting the converted signal to the automatic navigation device 130.
A valid information extraction module 121 which receives a signal from the ship electronic device 110 and extracts information data except for a header and a reserved character;
It comprises a standard protocol combination module 122 for combining the information data extracted by the valid information extraction module 121 in a standard protocol format and transmits to the automatic navigation device 130,
The valid information extraction module 121,
Receiving a signal from the ship electronic device;
Checking a header type in the received signal;
Determining the string length of the signal;
Classifying reserved characters;
And extracting the information data by determining whether valid data is obtained by comparing character counter values, and extracting the information data. delete A protocol integrated system 120 capable of converting a signal output from the ship electronic device 110 into a format that can be identified by the automatic navigation device 130 and transmitting the converted signal to the automatic navigation device 130.
A valid information extraction module 121 which receives a signal from the ship electronic device 110 and extracts information data except for a header and a reserved character;
It comprises a standard protocol combination module 122 for combining the information data extracted by the valid information extraction module 121 in a standard protocol format and transmits to the automatic navigation device 130,
In order to operate independently from the protocol integration system 120, the ship electronic device protocol integration system characterized in that the E-compass sensor which is a sub-system by connecting a separate communication port to the automatic navigation device 130 is connected. .

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