KR20170121607A - System and method for detecting error of automatic identification system apparatus - Google Patents

Abstract

A system for detecting the error of an automatic identification system (AIS) apparatus related to an embodiment of the present invention may include a slot tick generating part for generating a slot tick based on coordinated global time information, a communication part for receiving a baseband signal from an AIS apparatus, and a control part which determines whether a time from the time point of occurrence of the slot tick to the time point of a baseband signal is within a first time range set based on the maximum tolerance of a baseband signal reception time according to the communication method of the AIS apparatus, and determines whether the AIS apparatus malfunctions. It is possible to prevent the loss of radio resources occupied by malfunction.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a system and method for detecting an AIS equipment malfunction,

The present invention relates to an AIS equipment malfunction detection system and method.

The Automatic Identification System (AIS) used for maritime communications operates in accordance with the standard "ITU-R M.1371".

The ship using the AIS equipment performs data transmission using a slot allocation scheme based on SOTDMA (Self Organized Time Division Multiple Access) or a slot allocation scheme based on Carrier Sense Time Division Multiple Access (CSTDMA) according to the information of the ship .

The AIS equipment using the SOTDMA scheme analyzes the communication status information of the received message, calculates the slot area where data can be transmitted, and transmits the data through the calculated slot number.

The AIS equipment using the SOTDMA scheme transmits according to the transmission timing of the SOTDMA scheme, the synchronization time error of the ship station is allowed for a maximum of 312 ms, and the synchronization time error of the land station is allowed for a maximum of 104 ms.

The AIS equipment using the CSTDMA scheme detects CS (Carrier Sence) during a time interval of 833 ms to 1,979 ms in the slot to which data is to be transmitted. If no data is detected, the AIS equipment uses data in the slot in accordance with the transmission timing of the CSTDMA scheme And the synchronization time error is allowed for a maximum of 312 ms.

The AIS equipment should operate according to the transmission timing according to the transmission mode, but it may not operate properly due to the malfunction of the AIS equipment.

The AIS equipment using the SOTDMA scheme configures the transmission timing by analyzing the communication state information of the received message and the AIS equipment using the CSTDMA scheme determines the transmission time point based on the presence / absence of data detection in the slot to which the data is transmitted , Whether or not to transmit data in accordance with the transmission timing is not considered.

Therefore, even in a situation where the wireless communication environment and the wireless resource environment are bad, the AIS equipment performs data transmission.

1 is a diagram showing an example in which AIS equipment 1, 2 and 3 transmit data according to the AIS standard and the AIS equipment 4 receives the data at the same time.

1, the AIS equipment 1 transmits data according to the SOTDMA scheme, the AIS equipment 2 transmits data according to the normal transmission timing, the AIS equipment 3 transmits data according to the CSTDMA scheme, and the AIS equipment 4 transmits data according to the AIS equipment 1, 2 and 3, respectively. AIS equipment 1, 2, and 3 transmit data according to timing within each slot, so AIS equipment 4 normally receives data.

2 is a diagram showing an example in which AIS equipment 1, 2 and 3 AIS equipment 2 transmits data in a manner inconsistent with a transmission timing and AIS equipment 4 receives such data at the same time.

Referring to FIG. 2, the AIS devices 1 and 3 are attempting to transmit or transmit data at normal timing according to each method. However, the AIS equipment 2 transmits data in a manner inconsistent with the transmission timing due to a malfunction.

The AIS equipment 1 using the SOTDMA scheme transmits data irrespective of the AIS equipment 2 because it configures the transmission timing by analyzing the communication status information of the received message. As a result, the data transmitted by the AIS equipment 1 and the data transmitted by the AIS equipment 2 are mixed and the AIS equipment 4 may not be able to detect the data.

Also, the AIS equipment 3 detects the presence or absence of data in the slot to be transmitted in the CSTDMA scheme, and then transmits the data. However, it can be seen that the AIS equipment 2 can transmit only one slot and the available radio resources are reduced.

That is, as in the AIS equipment 2 of FIG. 2, there is a problem that the wireless communication environment is damaged by the AIS equipment that transmits data in a manner incompatible with the transmission timing due to malfunction.

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an AIS apparatus for transmitting AIS apparatuses that do not conform to transmission timings and to prevent deterioration of a wireless communication environment due to malfunction, Thereby preventing loss of radio resources.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

The AIS equipment malfunction detection system according to an embodiment of the present invention for realizing the above-mentioned problems includes a slot tick generating unit for generating a slot tick based on the coordinated global time information, a baseband signal receiving unit for receiving a baseband signal from an AIS And determines whether or not the time from the time of occurrence of the slot tick to the time of the baseband signal is within a first time range set based on the maximum allowable error of the baseband signal reception time according to the communication method of the AIS equipment And a controller for determining whether the AIS equipment malfunctions.

In addition, the first time range may be from a time point that is earlier by the maximum allowable error to a time that is later by the maximum allowable error based on a time point of a reference timing of the baseband signal according to the communication scheme of the AIS equipment.

When the communication method of the AIS equipment is SOTDMA, the first time range is 0.521 ms to 1.145 ms, and when the communication method of the AIS equipment is CSTDMA, the first time range is 2.084 ms to 2.708 ms have.

Also, the control unit determines whether the time from the generation of the slot tick to the end point of the baseband signal falls within a second time range set based on the maximum tolerance of the baseband signal reception time according to the communication method of the AIS equipment It is possible to determine whether the AIS equipment malfunctions.

The second time range may be from an earlier point of time of the maximum allowable error to an end of a next slot tick of the slot tick based on an end point of a baseband signal reception reference timing according to a communication scheme of the AIS equipment.

When the communication method of the AIS equipment is SOTDMA, the second time range is 23.855 ms to 26.667 ms. When the communication method of the AIS equipment is CSTDMA, the second time range is 25.417 ms to 26.667 ms. have.

The slot tick generator may be a Global Positioning System (GPS), a Global Navigation Satellite System (GNSS), a Loran-C, a GALILEO (Europian Satellite Navigation System), a QZSS Quasi-Zenith Satellite System) and GPS Aided Geo Augmented Navigation (GAGAN).

The control unit may detect a Maritime Mobile Service Identity (MMSI) from the baseband signal and identify the AIS equipment based on the maritime mobile service identification code.

The controller may detect a message ID from the baseband signal and determine whether the baseband signal is received through a plurality of slots based on the message ID.

When the base band signal is determined to be received through one slot, the control unit determines that the time from the generation of the slot tick to the end point of the baseband signal is shorter than the baseband signal reception time according to the communication method of the AIS equipment And determines whether the AIS equipment malfunctions or not by determining whether the AIS equipment is in a second time range based on the maximum allowable error of the AIS equipment.

If the communication scheme of the AIS equipment does not recognize either SOTDMA (Self Organized Time Division Multiple Access) or CSTDMA (Carrier Sense Time Division Multiple Access), the first time range is set to the SOTDMA A third time range from a time point of the maximum allowable error to a time point of the maximum allowable error and a time point of a base timing of the baseband signal according to the CSTDMA, And may include a fourth time range from an earlier point of time by the maximum tolerance to a point of time after the maximum tolerance.

When the time from the generation of the slot tick to the start of the baseband signal belongs to the third time range, the control unit determines that the time from the generation point of the slot tick to the end point of the baseband signal Judges whether the AIS equipment malfunctions by judging whether the AIS equipment belongs to the end of the reference timing of the baseband signal according to the SOTDMA from the time point of the maximum tolerance to the next slot tick occurrence point of the slot tick, When the time from the generation of the slot tick to the start of the baseband signal belongs to the fourth time range, the control unit determines that the time from the generation point of the slot tick to the end point of the baseband signal corresponds to the CSTDMA From the point at which the maximum allowable error is reached at an earlier point on the basis of the end point of the reference timing of the baseband signal Group can be determined whether the next slot belongs to a tick occurs and the time slot of the tick to determine whether a malfunction of the AIS equipment.

According to an aspect of the present invention, there is provided a method for detecting an AIS equipment malfunction, including the steps of generating a slotted tick based on coordinated global time information, receiving a baseband signal from an AIS (Automatic Identification System) Determining whether a time from a time point of occurrence of a slot tick to a time point of the baseband signal is within a first time range set based on a maximum allowable error of a baseband signal reception time according to a communication method of the AIS equipment, It is possible to judge whether or not the AIS equipment malfunctions.

In addition, the first time range may be from a time point that is earlier by the maximum allowable error to a time that is later by the maximum allowable error based on a time point of a reference timing of the baseband signal according to the communication scheme of the AIS equipment.

The determining of the malfunction of the AIS equipment may include determining a time from the time of occurrence of the slot tick to the end point of the baseband signal based on the maximum tolerance of the baseband signal reception time according to the communication method of the AIS equipment It is determined whether the AIS equipment is malfunctioning or not.

The second time range may be from an earlier point of time of the maximum allowable error to an end of a next slot tick of the slot tick based on an end point of a reference timing of a baseband signal according to a communication scheme of the AIS equipment.

The method may further include detecting a maritime mobile service identification (MMSI) from the baseband signal and identifying the AIS equipment based on the maritime mobile service identification code.

The method may further include detecting a message ID from the baseband signal and determining whether the baseband signal is received through a plurality of slots based on the message ID.

In addition, when determining that the baseband signal is received through one slot, the step of determining whether the AIS equipment malfunctions may include determining whether a time from the generation of the slot tick to the end point of the baseband signal is greater than a time It is further determined whether or not the AIS equipment malfunctions by determining whether it is within a second time range set based on the maximum allowable error of the baseband signal reception time according to the communication method.

Embodiments of the present invention can improve the performance of the maritime radio transmission and reception and prevent the loss of radio resources occupied by malfunctions by preventing the AIS equipment from transmitting malfunctioning due to erroneous operation.

It should be understood, however, that the effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
1 is a diagram showing an example in which AIS equipment 1, 2 and 3 transmit data according to the AIS standard and the AIS equipment 4 receives such data at the same time.
2 is a diagram showing an example in which AIS equipment 1, 2 and 3 AIS equipment 2 transmits data in a manner inconsistent with a transmission timing and AIS equipment 4 receives such data at the same time.
3 is a block diagram of an AIS equipment malfunction detection system according to an embodiment of the present invention.
4A to 4D are diagrams illustrating a procedure for deriving a malfunction discrimination criterion of the AIS equipment considering the transmission / reception timing tolerance in the SOTDMA scheme according to an embodiment of the present invention.
5A to 5D are diagrams illustrating a procedure for deriving a malfunction discrimination criterion of the AIS equipment considering the transmission / reception timing tolerance in the CSTDMA scheme according to an embodiment of the present invention.
6A to 6C are diagrams illustrating a procedure for deriving a malfunction discrimination criterion of the AIS equipment considering the reception timing tolerance in the SOTDMA system and the CSTDMA system according to an embodiment of the present invention.
FIG. 7 is a flowchart illustrating a method of detecting an AIS equipment malfunction according to an embodiment of the present invention.
8 is a block diagram illustrating a computing system that implements the AIS instrument malfunction detection method according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

3 is a block diagram of an AIS equipment malfunction detection system according to an embodiment of the present invention. 4A to 4D are diagrams illustrating a procedure for deriving a malfunction discrimination criterion of the AIS equipment considering the transmission / reception timing tolerance in the SOTDMA scheme according to an embodiment of the present invention. 5A to 5D are diagrams illustrating a procedure for deriving a malfunction discrimination criterion of the AIS equipment considering the transmission / reception timing tolerance in the CSTDMA scheme according to an embodiment of the present invention. 6A to 6C are diagrams illustrating a procedure for deriving a malfunction discrimination criterion of the AIS equipment considering the reception timing tolerance in the SOTDMA system and the CSTDMA system according to an embodiment of the present invention.

3, the AIS device malfunction detection system may include a slot tick generator 100, a communication unit 200, a controller 300, and the like.

However, the components shown in FIG. 3 are not essential, and an AIS equipment malfunction detection system having more or fewer components may be implemented.

The slot tick generator 100 periodically generates slot ticks based on the coordinated global time information. In the AIS standard specification, one frame is one minute and one frame contains 2250 slots, so that the length of one slot is 80/3 (ms). The slot tick is a signal for notifying the start of a slot at the start point of each slot, and the slot tick generator 100 can generate a slot tick every 80/3 (26.667) ms.

The slot tick generator 100 may generate a slot tick at the start of each slot based on Universal Time Coordinated (UTC) information. The slot-tick generating unit 100 includes a GPS (Global Positioning System), a Global Navigation Satellite System (GNSS), a Loran-C, a GALILEO (Europian Satellite Navigation System) The Quasi-Zenith Satellite System, the GPS Aided Geo Augmented Navigation (GAGAN), and the like.

The communication unit 200 receives the baseband signal from the AIS equipment, demodulates the signal on the baseband into a baseband signal, and detects the baseband signal. The communication unit 200 can wirelessly receive data according to the communication method of SOTDMA or CSTDMA as well as other communication methods not mentioned.

The controller 300 can determine whether the AIS equipment malfunctions based on the time of the baseband signal and the maximum allowable error of the baseband signal reception time according to the communication method of the AIS equipment.

Specifically, the controller 300 determines whether the time from the generation of the slot tick to the start of the baseband signal belongs to the first time range set based on the maximum tolerance of the baseband signal reception time according to the communication method of the AIS equipment It is possible to judge whether or not the AIS equipment malfunctions.

The first time range depends on the communication method of the AIS equipment. In order to determine the first time range, the control unit 300 may detect Maritime Mobile Service Identity (MMSI) from the baseband signal. The identification of the AIS equipment can also be identified by identifying the AIS equipment based on the detected maritime mobile service identification code.

Also, the controller 300 can detect a message ID (Identifier) from the baseband signal. The control unit 300 can determine whether the baseband signal is received through only one slot or a plurality of slots based on the detected message ID.

When the baseband signal is received through only one slot, the control unit 300 determines that the time from the generation of the slot tick to the end point of the baseband signal corresponds to the maximum allowable error of the baseband signal reception time according to the communication method of the AIS equipment It is determined whether the AIS equipment malfunctions or not based on the second time range.

Hereinafter, a method of deriving a first time range and a second time range as malfunction discrimination criteria of the AIS equipment and a method of determining the malfunction of the AIS equipment by the control unit 300 will be described with reference to FIGS. 4A to 6C.

First, the case where the AIS equipment transmits data in the SOTDMA system will be described.

4A shows a case where a baseband signal is transmitted at a reference timing. The baseband signal starts at 0.833 ms based on the slot tick, and ends after 24.167 ms based on the slot tick.

FIG. 4B shows a case where the baseband signal is transmitted as much as 0.312 ms, which is the maximum allowable error, based on the reference timing. The baseband signal starts at 0.521 ms based on the slot tick, and 23.855 ms It ends later.

FIG. 4C shows a case where the baseband signal is transmitted as late as the maximum allowable error of 0.312 ms based on the reference timing. The baseband signal starts at 1.145 ms based on the slot tick and 24.479 ms It ends later.

Consequently, the time point of the baseband signal should be within the maximum tolerance range based on the reference timing. Therefore, the first range in which the time point of the baseband signal should belong is from the point at which the maximum allowable error is reached to the point at which the maximum allowable error is late, based on the point of time of the baseband signal reception reference timing.

FIG. 4D is a view showing all of the viewpoints shown in FIGS. 4B and 4C. If the viewpoint of the baseband signal belongs to the section B of FIG. 4D, the baseband signal will not collide with the other baseband signal. If the time point of the baseband signal belongs to a region other than region B, the control unit 300 may determine that the AIS equipment that transmitted the baseband signal malfunctions.

According to an embodiment of the present invention, if the baseband signal is received through only one slot, the controller 300 may further determine whether the end point of the baseband signal belongs to the second range.

The endpoint of the baseband signal must belong to the point of occurrence of the next slot tick of the slot tick from a point as early as the maximum tolerance with respect to the end point of the reference timing so that the baseband signal does not invade the next slot.

That is, the end point of the baseband signal should belong to the slot except for A, B and C sections in the slot section of FIG. 4D.

Accordingly, when the baseband signal belongs to the A, B, or C section, the controller 300 may determine that the AIS device that transmitted the baseband signal is malfunctioning.

Next, a case where the AIS equipment transmits data by the CSTDMA method will be described.

5A shows a case where a baseband signal is transmitted at a reference timing. The baseband signal starts at 2.396 ms based on the slot tick, and ends after 25.729 ms based on the slot tick.

5B shows a case where the baseband signal is transmitted as much as 0.312 ms which is the maximum allowable error based on the reference timing. The baseband signal starts at 2.084 ms based on the slot tick, and 25.417 ms It ends later.

5c shows a case where the baseband signal is transmitted by 0.312ms, which is the maximum allowable error, based on the reference timing. The baseband signal starts at 2.708ms based on the slot tick, and 26.041ms It ends later.

As in the above-described SOTDMA system, the time point of the baseband signal must be within the maximum tolerance range based on the reference timing even in the CSTDMA system. Therefore, the first range in which the time point of the baseband signal should belong is from the point at which the maximum allowable error is reached to the point at which the maximum allowable error is late, based on the point of time of the baseband signal reception reference timing.

FIG. 5D is a view showing all of the viewpoints shown in FIGS. 5B and 5C. If the viewpoint of the baseband signal belongs to the section E of FIG. 5D, the baseband signal will not collide with the other baseband signal. If the time point of the baseband signal belongs outside the period E, the control unit 300 may determine that the AIS equipment that transmitted the baseband signal is malfunctioning.

According to an embodiment of the present invention, if the baseband signal is received through only one slot, the controller 300 may further determine whether the end point of the baseband signal belongs to the second range.

The end point of the baseband signal must belong to the point of occurrence of the next slot tick of the slot tick from a point as early as the maximum tolerance with respect to the end point of the reference timing so that the baseband signal does not invade the next slot.

That is, the end point of the baseband signal should belong to a section except D, E and F sections in the slot section of FIG. 5D.

Accordingly, when the end point of the baseband signal belongs to the D, E, or F section, the controller 300 may determine that the AIS equipment that transmitted the baseband signal malfunctions.

FIG. 6A is a view showing a malfunction discrimination criterion of the AIS equipment considering the transmission / reception timing tolerance in the SOTDMA system, FIG. 6B is a view showing a malfunction discrimination criterion of the AIS equipment considering the transmission / reception timing tolerance in the CSTDMA system, CSTDMA method according to an embodiment of the present invention.

The sections A and B of FIG. 6C are the same as the sections A and B of FIG. 6A, and the section E of FIG. 6C is the same section E of FIG. 6B. 6B is a section except the sections A and B of FIG. 6A in section D of FIG. 6B, the section C of FIG. 6A overlaps the section F of FIG. 6B, the section I is a section of FIG. And the section C in FIG. 6A is excluded in the section F.

In the above description, if the communication method of the AIS equipment is SOTDMA, the AIS equipment should operate normally when the base band signal is in the B zone, and if the communication method of the AIS equipment is CSTDMA, And that the AIS equipment should be in normal operation.

Accordingly, when the communication mode of the AIS equipment is not recognized as SOTDMA or CSTDMA, and the time of the baseband signal does not belong to any one of the B section and the E section, Can be judged to be a malfunction.

However, even if the time point of the baseband signal belongs to the section B, it is an abnormally transmitted baseband signal when the communication method of the AIS equipment transmitting the baseband signal is CSTDMA.

Accordingly, if the communication scheme of the AIS equipment can not recognize either SOTDMA or CSTDMA, the controller 300 determines which segment the end point of the baseband signal belongs to and determines whether the signal is a normally transmitted baseband signal.

If the baseband signal belongs to the period B and the baseband signal is the baseband signal of the SOTDMA scheme, the end point of the baseband signal is divided into the period A, B, G, E, and H A, B, and C). That is, the end point of the baseband signal must belong to the maximum tolerance of the SOTDMA scheme from the point at which the base band signal does not invade the next slot to the point at which the next slot tick occurs in the slot tick based on the end point of the reference timing.

If the baseband signal belongs to the period E and the baseband signal is the baseband signal of the CSTDMA scheme, the end point of the baseband signal is A, B, G, E, H and I (Section D, E and F in Fig. 6B). That is, the end point of the baseband signal must belong to a point from the earliest point of the CSTDMA scheme to the next slot tick occurrence point of the slot tick based on the end point of the reference timing so that the baseband signal does not invade the next slot.

Therefore, when the control unit 300 determines that the start point of the baseband signal belongs to the section B and that the end point of the baseband signal belongs to the section A, B, G, E, and H, It can be judged that the equipment is malfunctioning.

In addition, when the control unit 300 determines that the start point of the baseband signal belongs to the section E and that the end point of the baseband signal belongs to the section A, B, G, E, H and I, It can be judged that the transmitted AIS equipment malfunctions.

Hereinafter, a method for detecting an AIS equipment malfunction will be described in detail with reference to FIG.

Referring to FIG. 7, the method of detecting an AIS equipment malfunction may include periodically generating a slot tick (S100), receiving a miraculous band signal (S200), and determining whether the AIS equipment malfunctions (S300) have.

Hereinafter, steps S100 to S300 described above will be described in detail with reference to Figs. 3 to 6C.

In step S100, the slot tick generating unit 100 may periodically generate a slot tick based on the coordinated time information. The slot tick generation unit 100 may be a Global Positioning System (GPS), a Global Navigation Satellite System (GNSS), a Loran- C standard information from a system such as C (LORAN-C), GALILEO (Europian Satellite Navigation System), QZSS (Quasi-Zenith Satellite System), GAGAN (GPS Aided Geo Augmented Navigation)

In step S200, the communication unit 200 can receive the baseband signal from the AIS equipment. In order to receive the baseband signal, the communication unit 200 can detect the baseband signal by demodulating the radio-base signal into the baseband.

In step S300, the controller 300 determines whether the time from the generation of the slot tick to the start of the baseband signal falls within the first time range set based on the maximum allowable error of the baseband signal reception time according to the communication method of the AIS equipment , It is possible to judge whether the AIS equipment malfunctions or not.

The control unit 300 may detect the Maritime Mobile Service Identity (MMSI) from the baseband signal to identify the AIS equipment, identify the AIS equipment from the maritime mobile service identification code, Communication methods can also be identified.

Also, the controller 300 can detect a message ID (Identifier) from the baseband signal. The control unit 300 can determine whether the baseband signal is received through only one slot or a plurality of slots based on the detected message ID.

When the baseband signal is received through only one slot according to an embodiment of the present invention, the controller 300 determines that the time from the generation of the slot tick to the end point of the baseband signal corresponds to the baseband It is further determined whether the AIS equipment is malfunctioning or not based on the second time range set based on the maximum allowable error of the signal reception time.

The first time range and the second time range are as described above with reference to Figs. 4A to 5D.

If the control unit 300 can not recognize whether the communication scheme of the AIS equipment is SOTDMA or CSTDMA, the control can detect malfunction of the AIS equipment in the same manner as described above with reference to FIGS. 6A to 6C.

8 is a block diagram illustrating a computing system that implements the AIS instrument malfunction detection method according to an embodiment of the present invention.

8, a computing system 1000 includes at least one processor 1100, a memory 1300, a user interface input device 1400, a user interface output device 1500, (1600), and a network interface (1700).

The processor 1100 may be a central processing unit (CPU) or a memory device 1300 and / or a semiconductor device that performs processing for instructions stored in the storage 1600. Memory 1300 and storage 1600 may include various types of volatile or non-volatile storage media. For example, the memory 1300 may include a ROM (Read Only Memory) and a RAM (Random Access Memory).

Thus, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by processor 1100, or in a combination of the two. The software module may reside in a storage medium (i.e., memory 1300 and / or storage 1600) such as a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, You may. An exemplary storage medium is coupled to the processor 1100, which can read information from, and write information to, the storage medium. Alternatively, the storage medium may be integral to the processor 1100. [ The processor and the storage medium may reside within an application specific integrated circuit (ASIC). The ASIC may reside within the user terminal. Alternatively, the processor and the storage medium may reside as discrete components in a user terminal.

The above-described AIS apparatus malfunction detection method is not limited to the configuration and method of the embodiments described above, but the embodiments may be modified so that all or some of the embodiments are selectively combined .

100: Slot tick generator
200:
300:
1000: Computing System
1100: Processor
1200: System bus
1300: Memory
1310: ROM
1320: RAM
1400: User interface

Claims (19)

A slot tick generating unit for generating a slot tick based on the coordinated global time information;
A communication unit for receiving a baseband signal from an AIS (Automatic Identification System) equipment; And
Determining whether a time from a time point of occurrence of the slot tick to a time point of the baseband signal is within a first time range set based on a maximum tolerance of a baseband signal reception time according to a communication method of the AIS equipment, And a control unit for determining whether the AIS equipment malfunctions. The method according to claim 1,
Wherein the first time range is from a time point that is earlier by the maximum allowable error to a time point that is later than the maximum allowable error based on a time point of a reference timing of a baseband signal according to a communication scheme of the AIS equipment. Detection system. The method according to claim 1,
If the communication scheme of the AIS equipment is SOTDMA, the first time range is 0.521 ms to 1.145 ms,
Wherein the first time range is from 2.084 ms to 2.708 ms when the communication method of the AIS equipment is CSTDMA. The method according to claim 1,
The control unit determines whether the time from the generation of the slot tick to the end point of the baseband signal is within a second time range set based on the maximum tolerance of the baseband signal reception time according to the communication method of the AIS equipment And further determines whether the AIS equipment is malfunctioning or not. 5. The method of claim 4,
Wherein the second time range is from an early point by the maximum tolerance to an end point of a baseband signal reception reference timing according to a communication scheme of the AIS equipment, Equipment malfunction detection system. 5. The method of claim 4,
If the communication scheme of the AIS equipment is SOTDMA, the second time range is from 23.855 ms to 26.667 ms,
Wherein the second time range is from 25.417 ms to 26.667 ms when the communication method of the AIS equipment is CSTDMA. The method according to claim 1,
The slot tick generator may include a Global Positioning System (GPS), a Global Navigation Satellite System (GNSS), a Loran-C, a Europian Satellite Navigation System (GALILEO), a Quasi- Zenith Satellite System) and the GPS Aided Geo Augmented Navigation (GAGAN). The method according to claim 1,
Wherein the control unit detects a maritime mobile service identity (MMSI) from the baseband signal and identifies the AIS equipment based on the maritime mobile service identification code. The method according to claim 1,
Wherein the control unit detects a message ID from the baseband signal and determines whether the baseband signal is received through a plurality of slots based on the message ID. 10. The method of claim 9,
Wherein when the base band signal is received through one slot, the control unit determines that the time from the generation of the slot tick to the end point of the base band signal is equal to or greater than the maximum baseband signal reception time according to the communication method of the AIS equipment Further comprising determining whether the AIS equipment is malfunctioning by further determining whether the AIS equipment is within a second time range set based on the tolerance. The method according to claim 1,
Wherein,
If the communication method of the AIS equipment does not recognize either SOTDMA (Self Organized Time Division Multiple Access) or CSTDMA (Carrier Sense Time Division Multiple Access)
Wherein the first time range includes a third time range from a time point that is earlier by the maximum allowed error to a time point that is later by the maximum allowed error based on a time point of the base timing of the baseband signal according to the SOTDMA, And a fourth time range from a point at which the maximum allowable error is reached to a point at which the maximum allowable error is delayed from a point in time at which the reference timing of the signal is based. 12. The method of claim 11,
When the time from the generation of the slot tick to the start of the baseband signal belongs to the third time range,
Wherein the control unit controls the control unit such that the time from the generation of the slot tick to the end point of the baseband signal reaches the end point of the base timing of the baseband signal according to the SOTDMA, Determines whether the AIS equipment is malfunctioning or not,
When the time from the generation of the slot tick to the start of the baseband signal belongs to the fourth time range,
Wherein the control unit controls the control unit such that the time from the generation of the slot tick to the end point of the baseband signal is shorter than the maximum allowable error based on the end point of the base timing of the baseband signal according to the CSTDMA, And determining whether the AIS equipment malfunctions or not by determining whether the AIS equipment malfunctions. Generating a slotted tick based on the coordinated universal time information;
Receiving a baseband signal from an Automatic Identification System (AIS) device; And
Determining whether a time from a time point of occurrence of the slot tick to a time point of the baseband signal is within a first time range set based on a maximum tolerance of a baseband signal reception time according to a communication method of the AIS equipment, And determining whether the AIS equipment malfunctions. 14. The method of claim 13,
Wherein the first time range is from a time point that is earlier by the maximum allowable error to a time point that is later than the maximum allowable error based on a time point of a reference timing of a baseband signal according to a communication scheme of the AIS equipment. Detection method. 14. The method of claim 13,
The step of determining whether the AIS equipment malfunctions comprises:
It is further determined whether the time from the occurrence of the slot tick to the end point of the baseband signal is within a second time range set based on the maximum tolerance of the baseband signal reception time according to the communication method of the AIS equipment And determining whether the AIS equipment malfunctions. 16. The method of claim 15,
Wherein the second time range is from an earlier point in time of the maximum allowable error to a next slot tick occurrence point of the slot tick based on an end point of a reference timing of a baseband signal according to a communication system of the AIS equipment. How to detect equipment malfunction. 14. The method of claim 13,
Further comprising detecting a maritime mobile service identification (MMSI) from the baseband signal and identifying the AIS equipment based on the maritime mobile service identification code. 14. The method of claim 13,
Detecting a message ID from the baseband signal, and determining whether the baseband signal is received through a plurality of slots based on the message ID. 19. The method of claim 18,
If it is determined that the baseband signal is received through one slot,
The step of determining whether the AIS equipment malfunctions comprises:
It is further determined whether the time from the occurrence of the slot tick to the end point of the baseband signal falls within a second time range set based on the maximum allowable error of the baseband signal reception time according to the communication method of the AIS equipment And determining whether the AIS equipment malfunctions.

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