JP2008009846A - Wide area ship motion monitoring method and system - Google Patents

Abstract

An object of the present invention is to use AIS reception data to centrally monitor ship movements in a wide area such as a specific water area such as a bay or coast, to reproduce subsequent movements of ships, and to accurately count the number of ships in the overlapping reception range of receiving stations. And a wide-area vessel motion monitoring method and system that enable tracking of wakes.
A plurality of AIS receiving station apparatuses 1 having an antenna 1a for receiving AIS information transmitted from a ship equipped with an AIS and capable of distributing AIS reception data through the telecommunication line 3 are connected to the telecommunication line 3. The AIS server 2 includes an AIS database 21 storing AIS reception data distributed from each AIS receiving station apparatus 1 and an AIS database 21 when a predetermined ship α is requested to be monitored. The search means has a filter function for adopting any one AIS data when a plurality of AIS data of the ship exists within a predetermined time interval Tr.
[Selection] Figure 2

Description

  The present invention relates to a wide area ship movement monitoring method and system for use in navigation monitoring, suspicious ship monitoring, marine traffic fact-finding, etc. for ships navigating the sea area, and in particular for wide area monitoring and investigation suitable for wide area such as the entire bay area. The present invention relates to a ship motion monitoring method and system.

  In the sea areas around the world, a large number of various ships operating for various purposes come and go, and maritime traffic is congested. Especially in the bay area and the inland sea where the water area is limited, the ships are concentrated and the situation is very crowded. Therefore, in certain limited water areas, from the viewpoint of maritime traffic safety and environmental conservation, marine traffic is monitored by visual observation or radar images, but it is required to grasp information more widely and more accurately. Yes.

As inventions aimed at monitoring marine traffic over a wide area, for example, Japanese Patent Application Laid-Open No. 2005-208011 (Title of the Invention: Monitoring System and Monitoring Method), Special Table 2003-518307 (Title of Invention: Marine Monitoring Method), Japanese Patent Laid-Open No. 10-40500 (Title of Invention: Harbor Management System) and the like have been proposed.
JP 2005-208011 A Special table 2003-518307 gazette Japanese Patent Laid-Open No. 10-40500

  Example 2 of Patent Document 1 discloses a monitoring system in which two or more laser radar devices are provided and a plurality of laser radar devices monitor a wider area (paragraph). [0065], see FIG. However, this embodiment is intended to supplement the blind spot of one laser radar device with another laser radar device or to be used as a different function such as wide-angle imaging and zoom imaging (paragraph [0066] ), It is not described that the scanning ranges of a plurality of laser radar devices are integrated to widen the range.

  Patent Document 2 discloses a first stage in which a cooperating ship that passes through an area collects marine traffic information by its navigation device, and the ship transmits the information to a maritime monitoring main station. A marine traffic monitoring method is disclosed having a second stage for managing the overall traffic situation based on data collected by (see claim 1). The present invention makes use of the fact that most ships are equipped with radars, thereby making it possible to grasp all the ships and boats in the vicinity. Information (local information) is collected and transmitted to a predetermined land monitoring station. Paragraph [0014] states that “information collected by the land monitoring station is periodically transmitted to the centralized station so that it can be used as an image showing the traffic in the area completely and accurately”. However, it is unclear how to combine the local traffic information collected from cooperating vessels to grasp the overall traffic situation. In addition, in order to grasp the overall traffic situation, the radar device of the cooperating ship must scan so as to cover the entire area, and there is always an overlapping range in the local traffic information. It is unclear how to process such overlapping information.

  Patent Document 3 provides a port management facility and a communication management device each having a satellite communication function in a ship, and the ship-side communication management device transmits ship information of the ship through the mobile satellite. The communication management apparatus on the facility side transmits the traffic management information based on the received ship information, and the traffic management information based on the traffic management determination is transmitted via the mobile satellite. A harbor management system is disclosed in which the information is transmitted to the communication management device on the ship side (see claim 1). In the case of the present invention, a new capital investment is required, such as the development and installation of a dedicated communication management device for port management facilities and ships. Further, the ship side must actively transmit ship information, and it is not possible to monitor a ship that is not equipped with a communication management device.

  By the way, from the viewpoint of collision prevention and life safety, under the SOLAS Convention (International Convention for the Safety of Life at Sea), since July 1, 2008, in principle, all passenger ships and international voyages with a gross tonnage of over 300 tons Ships and ships that are not engaged in international voyages with a gross tonnage of 500 tons or more are required to be equipped with an Automatic Identification System (hereinafter referred to as “AIS”).

AIS can be obtained with conventional radar and automatic collision prevention assistance device (ARPA device) such as GPS ship position, IMO number, ship name, ship type, current ground course, ground speed, heading, operational status, etc. It is possible to monitor and observe various information related to the navigation of ships that did not exist in real time, as well as to supplement and track more than 1000 ships at the same time, as long as the target ship is within the reception range, with little influence from weather and sea conditions It is an effective means for ship navigation monitoring because it has a low risk of being missed. In addition, if there is no object that blocks radio waves, AIS can also receive information from the vicinity of the curved portion and from a ship in the shade, and can receive information in the range of about 20 to 30 nautical miles on the sea. The AIS is detailed in Non-Patent Document 1.
Nippon Foundation Library (Electronic Library) “Fish 2003 Electrical Engineering Course for Ships (Radar, AIS, VDR, GPS)” Chapter 3 Automatic Ship Identification System (AIS) http://nippon.zaidan.info/ seikabutsu / 2003/00139 / contents / 0011.htm

  Here, FIG. 8 is an image diagram of the AIS, (A) is an overall view of the bay, and (B) is a schematic diagram of the wake of the ship α. Since AIS has the purpose of preventing collisions, AIS information is transmitted and received between vessels within the AIS signal reception range (between vessel α and vessel β, between vessel β and vessel γ). However, in a specific water area, land receiving stations (for example, receiving stations A, B, and C) also receive AIS information. For example, in this figure, the receiving station A receives AIS information from the ships β and γ, and the receiving station C receives AIS information from the ships α and β. And each receiving station A, B, C is monitoring in order to ensure the safety of maritime traffic such as ships not colliding with each other within the respective receiving ranges (within the circle indicated by broken lines in the figure). . When targeting a narrow area centered on a specific receiving station, it is sufficient for each receiving station A, B, C to monitor only within each receiving range. Even when receiving only AIS signals from all ships with a receiving station alone, it is necessary to collectively monitor the movement of the ships. In addition, when conducting surveys and analysis of maritime traffic using the acquired information, it is necessary to accurately grasp which ship has passed by which wake and how many ships have passed. .

  In FIG. 8A, it is assumed that the ship α passes through the bay from the X point to the Y point on the wake shown in the figure. At this time, the ship α intersects the receiving ranges of the receiving stations A, B, and C at points P1, P2, P3, P4, and P5. As shown in FIGS. 8A and 8B, the ship α is supplemented only by the receiving station C in the range of X to P1, and supplemented by the receiving stations A and C in the range of P1 to P2, and P2 to P3. In this range, all of the receiving stations A, B, and C are supplemented. In the range of P3 to P4, the receiving stations A and B are supplemented. In the range of P4 to P5, only the receiving station B is supplemented. When the AIS information received by these receiving stations A, B, and C (hereinafter referred to as “AIS received data”) is used as it is, the AIS received data is duplicated in the range of P1 to P4. There are problems such as overlapping wakes to be displayed, wakes deviating at the sections crossing each reception range, and actually being counted as two or three ships that should have been one ship. In particular, it was difficult to conduct an accurate analysis in the actual survey of maritime traffic.

  The present invention has been devised in view of the above-mentioned problems, and it is possible to centrally monitor ship movements in a wide area such as a specific water area such as a bay or a coast while using AIS reception data. Wide-area ship motion monitoring method and system that can be extracted under predetermined conditions and can reproduce ship motions later, and can accurately grasp the number and wakes of vessels even in the overlapping reception range of the receiving station The purpose is to provide.

  According to the present invention, a method for monitoring AIS information transmitted from a ship equipped with an AIS and monitoring the movement of the ship, wherein a plurality of antennas are arranged in a wide area, and the AIS information received by each antenna is provided. (AIS received data) is aggregated to construct a database, and one AIS data is adopted when there are multiple AIS data (data obtained by creating a database of AIS received data) for the same ship within a predetermined time interval Thus, there is provided a wide-area ship motion monitoring method characterized by monitoring the motion of the ship. Here, whether or not the AIS data is for the same ship may be identified by an MMSI number, an IMO number, a ship name, or a call code.

  In addition, when a plurality of AIS data exists for the same ship within a predetermined time interval, the AIS data may be sorted according to a predetermined condition, and AIS data of a predetermined rank may be adopted. If the AIS data does not exist within the time interval, the previously adopted AIS data is searched. If the reception date and time does not exceed the predetermined disappearance time, the previous AIS data is maintained and the disappearance time is exceeded. In such a case, the motion display may be deleted.

  Further, in the AIS data, the missing static information may be supplemented from the ship information master data separately stored in the database, or the ship's movement may be reduced using the AIS data adopted from the database. It is possible to display an image, monitor or investigate / analyze the actual state of marine traffic, and distribute the AIS data through a telecommunication line. Using the AIS data, the hull length, the hull width, You may make it display the ship shadow marker which simulated the heading etc. on the predetermined | prescribed screen.

  According to the present invention, a system for receiving AIS information transmitted from a ship equipped with an AIS with an antenna and monitoring the movement of the ship, the AIS information (AIS reception data) received with the antenna. AIS having a plurality of AIS receiving station devices that can be distributed over a telecommunication line and an AIS server connected to the telecommunication line, wherein the AIS server stores AIS received data distributed from each AIS receiving station device A database and search means for searching the AIS database when there is a monitoring request for a predetermined ship, and the search means is any one when a plurality of AIS data of the ship exists within a predetermined time interval. A filter function for adopting one AIS data, based on the AIS data obtained by the search means; Fleet monitoring system for a wide area is provided, characterized in that to monitor the movements of 舶. Here, the search means may search for a ship by an MMSI number, an IMO number, a ship name, or a call code.

  The filter function may include a sorting function for rearranging the AIS data under a predetermined condition, and an extraction function for adopting the AIS data having a predetermined rank after sorting. If there is no AIS data for the ship requested to be monitored within the predetermined time interval, the previous search result is searched. If the reception date and time of the previous AIS data does not exceed the predetermined disappearance time, The previous AIS data may be maintained, and if the disappearance time has been exceeded, the motion display may be deleted.

  Furthermore, the AIS server is connected to ship information master data separately stored in a database, and has static information supplement means for supplementing data from the ship information master data when static information in the AIS database is insufficient. The AIS data obtained by the search means may be reproduced by a reproduction means for reproducing a moving image of a ship, an analysis means for monitoring or investigating / analyzing the actual state of marine traffic, and AIS data to a predetermined terminal through a telecommunication line. The AIS information stored in the AIS database may be extracted from the AIS information, and the hull length, hull width, heading, etc. may be extracted to create a ship shadow marker that simulates them, and the AIS You may have a ship shadow marker drawing means displayed on the screen of a server or the said terminal.

  According to the ship movement monitoring method and system for a wide area of the present invention described above, a database is constructed without integrating the data of the same ship at the time of data recording of AIS reception data of each receiving station, and duplication of data when using AIS data. Since the exclusion process is performed, it is possible to centrally monitor the movement of vessels in a wide area such as the entire area of a specific water area such as a bay or coastal area by simply storing AIS reception data of each receiving station in a predetermined server and storing it. It is possible to extract the AIS received data under the predetermined conditions and reproduce the movement of the ship afterwards, and to grasp the exact ship position, wake, number of ships, etc. even in the part where the receiving range of the receiving station overlaps Can do.

  When attempting to solve the above-described problems of the present invention, it is common to try to integrate the data of the same ship at the time of data acquisition and store them in a database. It is characterized by the occasional addition of data processing. As a result, the work required for this purpose can be greatly reduced, and the above-described problems can be achieved with a simple system configuration. In addition, since AIS, which is required to be installed by the SOLAS Convention, is used, it is very convenient, and it is possible to visually grasp not only the ship position but also the size of the ship by displaying the ship shadow marker when monitoring the ship. It can be used for traffic survey and analysis.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is an overall configuration diagram of a wide-area vessel movement monitoring system of the present invention, FIG. 2 is an overall processing conceptual diagram of the wide-area vessel movement monitoring system of the present invention, and FIG. It is a conceptual explanatory drawing of the search method of the AIS database used for a ship movement monitoring system.

  As shown in FIG. 1 to FIG. 3, the wide-area ship movement monitoring system of the present invention includes an antenna 1 a that receives AIS information transmitted from a ship equipped with an AIS and receives received AIS information (AIS reception data). The AIS server 2 includes a plurality of AIS receiving station devices 1 that can be distributed via the telecommunication line 3 and an AIS server 2 connected to the telecommunication line 3, and the AIS server 2 receives the AIS received data distributed from each AIS receiving station device 1. And a search means for searching the AIS database 21 when there is a monitoring request for a predetermined ship (for example, ships α, β, γ), and the search means has a predetermined time interval Tr. A filter function for adopting any one AIS data when a plurality of AIS data of a ship exists in the ship, and obtained by the search means It is designed to monitor the movements of the ship on the basis of the AIS data.

  The AIS receiving station apparatus 1 includes an antenna 1a, an AIS signal receiver 1b, and a computer 1c. The antenna 1a has functions of an AIS receiving antenna and a GPS receiving antenna, and may be an integrated type or a separated type, and is not limited to the illustrated one. The AIS signal receiver 1b converts the AIS information received by the antenna 1a into AIS reception data so that it can be used in a downstream system. The computer 1c is a device for constructing a local database for data backup at the time of communication failure while transmitting AIS reception data sent from the AIS signal receiver 1b to the AIS server 2 in real time. As the computer 1c, for example, a commercially available desktop type or notebook type personal computer is used. Further, in the computer 1c, as shown in FIG. 2, the AIS reception data on the AIS receiving station apparatus 1 side is prepared in case the distribution date information is missing in the AIS information or the distribution date cannot be read unless it is decoded. Is given a reception date and time. Thereby, when the AIS reception data is distributed to the AIS server 2, the date and time can be easily discriminated on the AIS server 2 side. The AIS receiving station apparatus 1 is arranged at three receiving stations A, B, and C, for example, as shown in FIG. More specifically, it is arranged at the receiving stations A, B, and C shown in FIG. When giving the reception date and time, a local clock of each computer 1c may be used, or a global clock using a GPS receiving antenna may be used.

  The AIS server 2 includes a CPU (central processing unit), a storage device such as a RAM, a ROM, and a hard disk, an input device such as a keyboard, and an output device such as a display, and executes the AIS database 21 and the search means in the storage device. Are stored and saved, and the AIS database 21 is constructed, searched, wakes are drawn on the electronic chart, and AIS data is distributed by executing predetermined programs on the CPU. Can be done. The AIS server 2 is disposed in the head office 4 that supervises the receiving stations A, B, and C. From the client terminal 5 (computer) in the head office 4, the AIS server 2 is connected via the electric communication line 6. Can be accessed.

  As shown in FIG. 2, the AIS database 21 is a database in which AIS reception data distributed from the AIS receiving station apparatus 1 arranged in each of the receiving stations A, B, and C is stored as AIS data. When creating a database, a so-called relational database management system (RDBMS) is used. The present invention does not combine AIS reception data of the same ship at the time of obtaining AIS reception data, but merely stores AIS reception data distributed from a plurality of receiving stations as a database. As will be described later, by performing predetermined processing on data that is duplicated when data is used, data processing during data accumulation is greatly reduced, and system simplification and processing speed are achieved. Therefore, a database can be constructed regardless of the number of receiving stations, and the number of receiving stations can be arbitrarily increased or decreased, which is optimal for widening the monitoring range.

  The AIS reception data includes static information, dynamic information, navigation information, and safety information. The static information is information for identifying what kind of ship the target ship is, such as the ship name and gist, MMSI number, call code, ship name, IMO number, hull length, hull width, ship type, Information such as antenna position is included. The MMSI number is an abbreviation of “Maritime Mobile Service Identity” and is an identification number assigned to each AIS device. The IMO number is a ship identification number assigned by IMO (International Maritime Organization). Is also called a signal letter or call sign, and consists of a combination of letters and numbers. These MMSI number, IMO number, call code, and ship name serve to identify the ship. The dynamic information is the information that represents the latest ship maneuvering status such as the position and speed of the target ship, and includes latitude, longitude, position accuracy, time, ground course, ground speed, heading, turning angular speed, navigation status (berthing, navigation , Grounding, maneuverability, etc.). The voyage information is information related to the route of the target ship and the loaded cargo, and includes information such as draft, type of dangerous goods, destination, and ETA (estimated port entry time). Safety information is supplementary information related to safety. The AIS information transmitted from the ship does not always include the four types of information, and each piece of information is often transmitted individually as AIS information. For example, dynamic information is generally transmitted every 3 minutes and static information is transmitted every 6 minutes.

  The AIS server 2 is connected to ship information master data 22 that is databased separately from the AIS database 21. The ship information master data 22 may be stored in the hard disk of the AIS server 2 in the same manner as the AIS database 21 or a database stored in an external computer connected via the telecommunication lines 3 and 6. Also good. The ship information master data 22 indicates that not all data is necessarily input to the static information of the AIS information transmitted from the ship, and information that cannot be acquired by the AIS information may be necessary. In consideration, it is used to supplement the AIS received data and store it in the AIS database 21 as AIS data. When supplementing the AIS received data, when the AIS received data is taken into the AIS server 2, the ship information master data 22 is accessed automatically or manually as necessary after checking for insufficient data. Alternatively, when the AIS received data is taken into the AIS server 2, the ship information master data 22 may be accessed without fail, or the AIS received data is directly stored as AIS data in the AIS database 21. You may make it access the ship information master data 22 manually or automatically later as needed. When the ship information master data 22 is accessed and data is inquired, the MMSI number, IMO number, ship name, or calling code is used as a key. If there is no insufficient information in the AIS reception data, the AIS reception data may be registered in the AIS database 21 as AIS data as it is.

  The telecommunication line 3 and telecommunication line 6 connect various communication lines (public lines such as telephone lines, ISDN lines, ADSL lines, private lines, wireless communication networks) using the communication protocol TCP / IP. This is a distributed IP network to be constructed, and this IP network includes LANs such as intranets (intra-company networks) and home networks based on 10BASE-T and 100BASE-TX.

  Next, a description will be given of a case in which the AIS data in the AIS database 21 is used to monitor the movement of a ship. Here, FIG. 4 is a flowchart showing the processing steps in the case where there is a request for motion display for the ship α.

  As shown in FIG. 4, when a motion / activity display request (S1) of the ship α is made, first, it is searched whether or not there is AIS data of the ship α within a preset motion / monitoring interval Tr (S2). Whether or not the AIS data of the ship α is used is, for example, an identification code that can identify the ship such as an MMSI number, an IMO number, a ship name, and a call code. The movement monitoring interval Tr is, for example, 10 seconds, but can be set arbitrarily. If there is AIS data of the vessel α within the movement monitoring interval Tr, it is determined whether there are a plurality of corresponding AIS data (S3). This is because, in a range where the receiving ranges of the receiving stations overlap, the AIS data that is overlapped at the same time is stored in the AIS database 21. Further, when the movement monitoring interval Tr is set to be longer than the transmission interval of the AIS information, duplicate AIS data of the same receiving station is stored in the AIS database 21 even when the receiving ranges of the receiving stations do not overlap. It is because it ends up. When there is only one AIS data (that is, when the receiving ranges of the receiving stations do not overlap and the movement monitoring interval Tr is shorter than the transmission interval of AIS information), the AIS data is adopted and the movement of the vessel α The display is updated (S4).

  When there are a plurality of corresponding AIS data (for example, when the reception ranges of the receiving stations overlap), the corresponding AIS data is sorted in descending order by the reception date and time (S5). At this time, new data of the reception date / time comes first. The first AIS data is adopted (S6), and the dynamic display of the ship α is updated (S4). The sort in S5 may be in ascending order, or may be sorted by the reception date and time of the AIS server 2, the ID of the receiving station, etc. in addition to the reception date and time of AIS data. As the adoption method in S6, the order may be arbitrarily designated such as adopting the second or last AIS data. Steps S5 to S6 correspond to the filter function of the AIS database 21. In addition, when the AIS database 21 is constructed, it may be sorted and stored in advance according to the reception date and time, and the sorting step of S5 may be omitted. With such a filter function, the AIS data within the movement monitoring interval Tr can be uniquely obtained, and even when the reception ranges of the receiving stations overlap, other data is excluded and the movement of the ship is determined by using only AIS data. The number of ships can be accurately grasped even when investigating and analyzing the actual state of maritime traffic.

  When there is no AIS data of the ship α within the movement monitoring interval Tr, the AIS data adopted last time is searched (S7). If there is no previous AIS data, the vessel designation may be wrong or the AIS data for vessel α may not be acquired normally, so an error display without corresponding data is displayed (S8).

  When the AIS data adopted last time is found in S7, it is determined whether or not the AIS data exceeds the disappearance time Td (S9). If the previous AIS data exceeds the disappearance time Td, the ship α recognizes that it has departed from the reception range of any receiving station, and erases the wake drawing of the ship α (S10). On the other hand, if the AIS data does not exceed the disappearance time Td, the previous AIS data is maintained and displayed as it is without updating the moving and static display of the vessel α (S11). The disappearance time Td is, for example, 10 minutes, but can be arbitrarily set. Further, instead of S11, the current predicted value may be calculated from the previous AIS data, and the predicted value may be displayed. Here, the device for drawing the wake (hereinafter referred to as “wake drawing device”) uses the AIS data obtained by the above-described flow to display the wake as a result of the movement of the ship at regular intervals. And is mounted on the AIS server 2 and the client terminal 5. This wake drawing device can serve as a reproducing means for reproducing a moving image of a ship and an analyzing means for investigating and analyzing the actual state of marine traffic.

  The concept in the case where the movements of the vessels α, β, γ are monitored according to the flow shown in FIG. 4 will be described with reference to FIG. In FIG. 3, the vertical axis represents elapsed time. It is assumed that the AIS data of the vessel α, the vessel β, and the vessel γ are accumulated in the AIS database 21 up to Tα, Tβ, and Tγ in order from the left. Here, for convenience of explanation, AIS data is organized and displayed for each ship, but in the actual AIS database 21, the data is not necessarily organized and stored for each ship. Moreover, although the state which sorted AIS data of each ship in descending order by the reception date and time is shown, this is also a measure for convenience of explanation. The AIS data may be static information, dynamic information, voyage information, and safety information, but here all are handled as dynamic information. The movement monitoring interval Tr is displayed as a difference between the current time and the previous time, a difference between the previous time and the previous time,.

  In the case of the ship α, three AIS data are accumulated within the movement monitoring interval Tr from the current time. Here, the AIS data at substantially the same time is displayed in a different stage, but this is merely an explanatory measure for making it easy to understand that the AIS data is from a different receiving station. That is, the fact that three AIS data are accumulated in the movement monitoring interval Tr means that, for example, at this time, the ship α exists in the reception range of three different receiving stations. Of these, the latest AIS data (shaded AIS data in the figure) is adopted, and the dynamic display of the vessel α is updated. Next, in the case of the ship β, there is no AIS data within the movement monitoring interval Tr from the current time. Therefore, looking at the AIS data adopted last time, the previous AIS data (shaded AIS data in the figure) of the ship β does not exceed the disappearance time Td. Therefore, the dynamic display of the vessel β is maintained by the previous AIS data. Finally, in the case of the ship γ, there is no AIS data within the movement monitoring interval Tr from the current time, as in the case of the ship β. Further, in the case of the ship γ, the AIS data adopted last time exceeds the disappearance time Td. Therefore, the movement display of the ship γ is deleted.

  Next, examples in which wakes are output on the screen by the wake drawing device using the above-described wide-area ship movement monitoring system are shown in FIGS. When drawing the track, the AIS server 2 can select three types: (1) no track display, (2) track line display, and (3) track marker display. Here, FIG. 5 is a diagram showing a case of wake line display, and FIG. 6 is a diagram showing a case of wake marker display. Moreover, FIG. 7 is a drawing of the state of Tokyo Bay at a certain date and time using the wake line display.

  FIG. 5 shows a partial sea area of a certain port 51, and a hatched portion represents a land portion (including a port facility and a landfill) 52. When the AIS data selected from the AIS database 21 at every movement monitoring interval Tr is plotted on the screen and connected with lines, a wake line 53 is drawn on the screen. By displaying the movement of the ship with the wake line 53, the danger situation accompanying the ship navigation, the traffic volume on the route or the traffic congestion situation can be visually grasped by the approaching condition, the crossing condition, or the congestion condition of the ships on the wakeline 53. be able to. In FIG. 5, eight wake lines are drawn on the screen.

  FIG. 6 shows the AIS data selected from the AIS database 21 plotted on the screen and displayed using the ship shadow marker 54. Similarly to FIG. 5, a partial sea area of a certain port 51 is shown, and a hatched portion represents a land portion (including a port facility and a landfill) 52. As the marker, either a triangular marker or a ship shadow marker 54 can be selected and used. The triangular marker is a marker that is generally used in this field, and ships are displayed with triangles having the same size regardless of the size of the hull. The center of the triangle represents the ship position and the direction of the triangle represents the heading. On the other hand, the ship shadow marker 54 is displayed as a ship shadow-like marker simulating the hull length and the hull width at the same scale as the chart, and the ship position and heading can be recognized as indicated by the marker. With this marker display, it is possible to visually grasp the position of the ship at each set time, and it is also possible to grasp the hull movement and the speed change by the change in the direction and interval of the marker. In particular, when the ship shadow marker 54 is used, it is possible to visually grasp the dangerous situation in marine traffic, the traffic volume on the route, or the traffic jam situation by the approaching condition, the crossing condition, or the congestion condition of the ships. It can be used for analysis. In addition, statuses such as anchoring, mooring, grounding, and maneuverability may be displayed with a predetermined symbol marker.

  FIG. 7 is a diagram in which AIS data is experimentally acquired from receiving stations around Tokyo Bay, and the state of Tokyo Bay is displayed as a wake line. In FIG. 7, about 160 ships including anchored ships are displayed, but no overlapping track line is drawn for each ship, and one clean track line is drawn for each ship. ing. As described above, by using the wide-area vessel movement monitoring system according to the present invention, it is possible to monitor the movement of vessels in the wide area of Tokyo Bay as a whole, and to accurately detect the wake and traffic volume when investigating and analyzing the actual state of maritime traffic. Can be easily grasped.

  According to the ship movement monitoring system for a wide area described above, a plurality of antennas 1a are arranged in a wide area, the AIS information received by each antenna 1a is aggregated to construct a database, and a plurality of the same ship within a predetermined time interval. It is possible to realize a wide-area vessel movement monitoring method that adopts any one AIS information and monitors the vessel movement when AIS information exists. That is, according to the above-described present invention, “AIS generally has an external communication port, and information received via this port can be transmitted as digital information to an external connection device, and the ship's real-time operation status Taking advantage of the fact that it can be easily processed with a personal computer ", the AIS is a device for simply providing navigation support information to the ship operator and for monitoring the movement of the ship to ensure the safety and efficiency of maritime traffic. It can function effectively as a device for data collection and analysis of actual sea traffic for port planning and research. In addition, it compensates for the shortcoming of “because it is a method of use other than the original purpose of AIS, so only ships within the receiving range centered on the receiving location can be monitored”. For example, in a bay with a wide area and a lot of blind spots such as Tokyo Bay Even when collecting and analyzing ship movement monitoring or maritime traffic data, the entire bay area can be covered by installing multiple AIS receiving station devices 1 and an AIS server 2 that integrates them. Furthermore, a database for analyzing marine traffic data was constructed to compensate for the shortcoming of “the AIS device is a device for voyage support, so it only has a function to display the movement of the ship at the present time”. It is possible to display only the necessary movements of the ship by regenerating the movements and setting conditions such as the target period and ship type. In addition, it is possible to easily and arbitrarily expand the monitoring range by increasing the number of receiving stations or connecting multiple AIS servers 2 via a network and installing an integrated server. You can also

  The program for managing the AIS database 21 of the AIS server 2 includes a function for receiving the AIS reception data, a function for constructing the AIS database 21 from the AIS reception data, a function for inquiring the ship master data 22, and a predetermined ship from the AIS data. In addition to the function of drawing the wake, the function of distributing predetermined AIS data and the function of exporting AIS data may be provided. With the AIS data distribution function, it is possible to monitor the movement of the ship at the client terminal 5 in the head office 4 connected to the AIS server 2 by the electric communication line 6 in the same manner as the AIS server 2. Moreover, you may make it open to the public widely using the telecommunication line 3. The export function is for extracting predetermined AIS data from the AIS database 21 and outputting the data to a file in text format or CSV format in order to perform more detailed analysis than the track display. In addition, a new database may be constructed using data that has been subjected to the process of excluding duplicate AIS data using the AIS data distribution function and the export function. By reconstructing such a database, it is possible to improve convenience such that traffic volume can be easily analyzed.

  The present invention is not limited to the above-described embodiment, and a plurality of AIS receiving station apparatuses 1 may be arranged in the same receiving station to ensure redundancy. A unique ID is assigned to the AIS receiving station apparatus. The ID may be distributed together with the AIS reception data and stored in the AIS database 21. The AIS reception data and the AIS data may be compressed and decoded as necessary. Of course, various changes can be made without departing from the scope.

1 is an overall configuration diagram of a wide area ship movement monitoring system according to the present invention. It is a whole processing conceptual diagram of the ship dynamics monitoring system for wide areas of the present invention. It is a conceptual explanatory drawing of the search method of the AIS database used for the ship dynamics monitoring system for wide areas of this invention. It is explanatory drawing which shows the 2-cycle internal combustion engine which employ | adopted this invention, (A) is a fragmentary sectional front view, (B) is a B arrow view in (A). It is a flowchart which shows the process process when there exists a dynamic display request | requirement about a predetermined | prescribed ship. It is the example which drawn the wake using the wide area ship movement monitoring system, and is a figure which shows the case of a wake line display. It is the example which drawn the wake using the wide area ship movement monitoring system, and is a figure which shows the case of a marker display. It is the figure which drawn the wake of Tokyo Bay using the ship dynamics monitoring system for wide areas. It is an image figure of AIS, (A) is a whole bay view, (B) is a wake schematic diagram of ship α.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AIS receiving station apparatus 1a Antenna 1b AIS signal receiver 1c Computer 2 AIS server 3,6 Telecommunications line 4 Head office 5 Client terminal 21 AIS database 22 Ship information master data 51 Port 52 Land part 53 Wake line 54 Ship shadow marker

Claims (14)

A method of receiving AIS information transmitted from a ship equipped with a ship automatic identification device (AIS) and monitoring the movement of the ship,
A plurality of antennas are arranged in a wide area, the AIS information received by each antenna is aggregated to construct a database, and when there is a plurality of AIS information for the same ship within a predetermined time interval, any one AIS information And monitoring the movement of the ship. A method for monitoring the movement of the ship for a wide area.   The wide-area ship motion monitoring method according to claim 1, wherein whether or not the AIS information is for the same ship is identified by an MMSI number, an IMO number, a ship name, or a call code.   2. When a plurality of AIS information exists for the same ship within a predetermined time interval, the AIS information is sorted according to a predetermined condition, and AIS information of a predetermined rank is adopted. Item 3. The wide-area ship movement monitoring method according to Item 2.   If the AIS information does not exist within the predetermined time interval, the previously adopted AIS information is searched, and if the reception date and time does not exceed the predetermined disappearance time, the previous AIS information is maintained and the disappearance time is exceeded. 4. The wide-area vessel movement monitoring method according to any one of claims 1 to 3, wherein the movement / movement display is erased if there is any.   5. The wide-area ship movement monitoring according to claim 1, wherein, in the AIS information, missing static information is supplemented from ship information master data separately stored in a database. Method.   2. A moving and static image of a ship is displayed using AIS information adopted from the database, the actual state of marine traffic is monitored or investigated and analyzed, or the AIS information is distributed through a telecommunication line. The wide-area ship motion monitoring method according to claim 5.   The ship for wide area according to claim 6, wherein at least a ship shadow marker that simulates a ship length, a ship width, and a heading direction is displayed on a predetermined screen using the AIS information stored in the database. Movement monitoring method. A system that receives AIS information transmitted from a ship equipped with a ship automatic identification device (AIS) by an antenna and monitors the movement of the ship,
A plurality of AIS receiving station apparatuses that are provided with the antenna and are capable of distributing received AIS information through a telecommunication line; and an AIS server connected to the telecommunication line, wherein the AIS server is connected to each AIS receiving station apparatus. An AIS database storing AIS information to be distributed; and search means for searching the AIS database when there is a monitoring request for a predetermined ship. The search means includes an AIS for the ship within a predetermined time interval. A wide area ship having a filter function for adopting any one of AIS information when a plurality of information exists, and monitoring the movement of the ship based on the AIS information obtained by the search means Motion monitoring system.   9. The wide area vessel movement monitoring system according to claim 8, wherein the search means searches for a vessel by an MMSI number, an IMO number, a ship name, or a call code.   The said filter function is provided with the sort function which rearranges the said AIS information on a predetermined condition, and the extraction function which adopts the AIS information of the predetermined order | rank after a sort. 9. A ship motion monitoring system for a wide area according to 9.   When the AIS information does not exist within a predetermined time interval for the ship requested to be monitored, the search means searches the previous search result, and the reception date and time of the previous AIS information exceeds the predetermined disappearance time. 11. The wide-area vessel movement / monitoring system according to claim 8, wherein the previous AIS information is maintained if there is not, and the movement / movement display is deleted if the disappearance time is exceeded.   The AIS server is connected to ship information master data separately stored in a database, and has static information supplement means for supplementing data from the ship information master data when static information in the AIS database is insufficient. The wide-area vessel motion monitoring system according to claim 8, wherein the ship motion monitoring system is used for a wide area.   The AIS server uses the AIS information obtained by the search means to reproduce AIS information to a predetermined terminal through a reproduction means for reproducing a moving image of a ship, an analysis means for monitoring or investigating / analyzing the actual state of marine traffic, or a telecommunication line. The wide-area ship motion monitoring system according to claim 8, further comprising distribution means for distributing. The AIS server or the terminal extracts at least the hull length, hull width, and heading from the AIS information stored in the AIS database, creates a ship shadow marker that simulates them, and displays it on a predetermined screen. The ship motion monitoring system for a wide area according to claim 13, further comprising ship shadow marker drawing means.