JP2015197773A - Navigation information discrimination apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a navigation information discrimination apparatus which assesses authenticity of transmission information transmitted by radio via a navigation monitoring automatic broadcasting system, or authenticity of a transmitting end of the transmission information, and which provides highly accurate assessment of authenticity of radio stations and transmission information without sacrificing compatibility with original specifications and configurations.SOLUTION: A navigation information discrimination apparatus includes: first position acquisition means which acquires a first position of a target detected by a radar and being a subject for tracking by the radar; second position acquisition means which acquires a second position of the target transmitted by radio via a navigation monitoring automatic broadcasting system; and discrimination means which identifies an actual coverage area of the radar and assesses authenticity of a radio station or transmission information from a correlation between the first position and the second position in a range of the coverage area.

Description

  The present invention relates to a navigation information discriminating apparatus that discriminates transmission information wirelessly transmitted via a navigation surveillance automatic broadcasting system or authenticity of a transmission end of the transmission information.

  AIS (Automatic Identification System) devices are being installed in many ships to improve safety and convenience in navigation, as they are being made cheaper, smaller, with lower power consumption and higher functionality as technology advances. .

  In addition, such an AIS device is suitable for ships that have a gross tonnage of 300 tons or more for ships that sail internationally, ships that have a total tonnage of 500 tons or more for ships that travel only in the territorial waters, and passenger ships that sail internationally. The loading obligation is imposed on all. In addition, many simple AIS devices that can be operated even if there are no radio workers are being installed in ships that do not have the obligation to install them.

FIG. 10 is a diagram illustrating a configuration example of the AIS apparatus.
In the figure, the feeding points of the antennas 31AIS and 31GPS are respectively connected to the first antenna terminal and the second antenna terminal of the transponder 40, and the digital input / output port of the transponder 40 is connected to the cascaded collector / distributor 50 and An operation display unit 60 is connected. A desired external device or sensor (none of which is shown) is connected to the collector / distributor 50.

The transponder 40 includes the following elements.
(1) A switch (SW) 41 which is a single pole double throw and whose common contact is connected to the first antenna terminal.
(2) Hybrid (H) 42 having a first terminal connected to the make (break) contact of switch 41

(3) TDMA receivers 43-1 and 43-2 and DSC receiver 44 connected to the second to fourth terminals of the hybrid 42, respectively.
(4) Modulator / demodulator 45 having first to third demodulation inputs connected to the outputs of these TDMA receivers 43-1, 43-2 and DSC receiver 44, respectively.

(5) A transmitter 46 having a modulation input connected to the modulation output of the modem 45 and having an output connected to a break (make) contact of the switch 41
(6) GPS receiver 47 having an input connected to the second antenna terminal

(7) A control unit 48 having a digital input / output port connected to the above described collector / distributor 50 in addition to an input / output port connected to the input / output port of the modem 45 and the output of the GPS receiver 47, respectively.

  In the AIS apparatus having such a configuration, the switch 41 and the TDMA receiving units 43-1 and 43-2 operate under the control of the control unit 48, and provide the modulation / demodulation unit 45 with a received wave that has arrived at the antenna 31AIS from another ship.

  The modem unit 45 demodulates the received wave to obtain transmission information arranged in each field of the message in the format shown in FIG. Such transmission information includes, for example, identification information of other ships, heading, ship position, course, speed, etc. (hereinafter referred to as “notification information”). The control unit 48 converts the notification information obtained in this way into information of a predetermined format and content, and delivers it to the operation display unit 60 via the collector / distributor 50. The operation display unit 60 displays information delivered from the control unit 48 via the collector / distributor 50, thereby notifying personnel involved in the navigation of the ship.

  On the other hand, the collector / distributor 50 is linked to the above-described external devices and sensors under the control of the control unit 48, thereby identifying the ship's identification information, heading, ship position, course, speed, etc. (hereinafter referred to as "notification information"). ) Are collected and given to the control unit 48.

  The GPS receiving unit 47 applies a predetermined satellite navigation to a radio signal arriving at the antenna 31 GPS from a GPS satellite (not shown), so that the time (based on the multiple access performed by the TDMA receiving units 43-1 and 43-2 and the like) And the position of the ship (antenna 31GPS), and the position is handed over to the control unit 48 as information that can be incorporated into the notification information of the ship.

  The control unit 48 converts these pieces of information into a predetermined format and gives the information to the modem unit 45. The modem unit 45 generates a transmission wave modulated with such information in the form of a control unit 48. The transmission unit 46 transmits the transmission wave to other ships and land stations via the switch 41 and the antenna 31AIS under the control of the control unit 48.

  Note that such transmission waves conform to a predetermined time division multiplexing system under the synchronization control performed by the TDMA receiving units 43-1 and 43-2 to receive the above-described received waves under the control unit 48. It is generated as a burst wave during the transmission time slot (reserved under the control of the control unit 48 or assigned to the ship).

  That is, the AIS device automatically notifies the ship's notification information to surrounding ships and land stations, obtains notification information notified in the same manner from other ships, and performs predetermined processing to obtain the ship. It is used to support collision control, cargo information, navigation management operations, maritime security operations, operation control at ports, etc.

  As prior arts related to the present invention, there are Patent Documents 1 to 5 listed below.

(1) “Ship position information extracting means that receives a ship identification signal transmitted from a ship and extracts at least position information of the ship from the ship identification signal; and captures the position of a target from radar detection data; Target capturing / tracking means for tracking, a first mark indicating the position or speed vector of the ship obtained by the ship position information extracting means, and the position or speed vector of the target obtained by the target capturing / tracking means Control means for displaying the first mark in preference to the second mark at the display position of the first mark or in the vicinity thereof. "The table when displaying the mark of another ship by the automatic vessel identification device (AIS) and the mark of the target by the automatic collision prevention assistance device (ARPA) on the same display screen. The ship display device is characterized in that it eliminates the complexity of the displayed contents and makes it possible to effectively use the capabilities of ARPA.

(2) “Detecting means for detecting other ship information including at least position information of other ships, and the importance of the other ship information detected by the detecting means is determined according to a predetermined condition, and the importance of a preset range is determined. By providing other ship information extracting means for extracting other ship information and a display control means for graphically displaying the position of the other ship corresponding to the extracted other ship information, When displaying the relative position relationship between other ships and own ship or between other ships in graphic form, it prevents the display from becoming complicated when the number of other ships increases and improves visibility. '' Other ship display device with ... Patent Document 2

(3) “The AIS device of the ship with the ARPA radar device is connected to the ARPA radar device via the interface, and the dynamic information of the nearby vessel to be received and the radar symbol information acquired from the ARPA radar device are compared every moment. , Radar symbol information without dynamic information for which a predetermined match is recognized is set as transmission stop warning information, dynamic information without radar symbol information with a predetermined match is set as intangible notification warning information, and the warning information is displayed. By displaying on the device and prompting the operator to be vigilant, and converting the alert information into a report and transmitting it to a nearby vessel, the “transmission AIS device does not stop transmission or the dynamic information without the entity, transmission information By receiving AIS devices and prompting vigilance, the environment where the deterrence effect against unauthorized information transmission is realized is realized. Reliability method AIS transceiver information characterized by the reliability improved "point location ... Patent Document 3

(4) “A ship's navigation support system that is installed in a ship and supports navigation, an AIS (automatic ship identification) device that receives target ship information transmitted from the target ship, and a target ship captured from the radar signal of the radar. ARPA (Automatic Collision Prevention Assistance) device for tracking the ship, own ship position information specifying means for specifying the ship position, and relative to the ship of the target ship from the received target ship position information and the specified ship position information Target relative position calculating means for calculating the position, and the same target determining means for specifying the same target ship that is being tracked by the ARPA device from the relative position of the target ship calculated by the target relative position calculating means And AIS information monitoring means for monitoring the accuracy of the target ship information received by the AIS device and determining whether the target ship information received by the AIS device is incorrect. When the AIS information monitoring means determines that the target ship information is incorrect, it outputs an abnormal signal. By using the characteristics of the AIS device and the ARPA device, the ARPA device complements the AIS device. And improve the reliability of the target ship information received by the AIS device ".

(5) “Target ship information receiving means for receiving target ship position information transmitted from the target ship or a third party in a ship navigation support apparatus that is mounted on a ship and supports navigation, and identifies the ship position. The target ship position information specifying means, the target ship position information calculating means for calculating the relative position of the target ship to the ship from the received target ship position information and the specified ship position information, and the radar signal of the radar The target ship capture and tracking means for providing the movement information of the target ship from the history, the target ship relative position calculated by the target relative position calculation means and the target ship capture and tracking means being tracked The same target determination that identifies the target ship that has obtained the target ship position information by the target ship information receiving means, which is the same as the target ship that is being tracked by the target ship capturing and tracking means, by comparing the relative position of the target ship. Means and equipment The same target determination means is further provided with the same target determination period limiting means for limiting the period during which the same determination is performed. A ship navigation support apparatus characterized by “complementing by utilizing each characteristic of the target ship information received and efficiently integrating information on the target ship”. Patent Document 5

JP 2002-372583 A JP 2003-048595 A JP 2005-141656 A JP 2005-181078 A JP 2005-182539 A

  By the way, in the above-mentioned conventional examples and patent documents, the authenticity of the position notified from a non-existing ship or the like is not positively discriminated, or the radio navigation that requires a complicated and large processing amount is used in combination. Has been realized.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a navigation information discriminating apparatus in which authenticity of a radio station and transmission information can be achieved with high accuracy without impairing conformity to the original specification and configuration.

  In the first aspect of the invention, the first position acquisition means acquires the first position of the target that is detected by the radar or that is the tracking target linked to the radar. The second position acquisition means acquires a second position wirelessly transmitted through the navigation monitoring automatic broadcast system for the target. The discriminating means identifies a substantial coverage area of the radar and determines whether the radio station or the transmission information is true or false as a correlation between the first position and the second position in the coverage area. To do.

  That is, the authenticity of the position of each wireless station wirelessly transmitted via the navigation monitoring automatic broadcast system is determined based on the collation with the position detected by the radar.

  In the invention according to claim 2, the first position acquisition means acquires the first position of the target that is detected by the radar or that is the tracking target linked to the radar. The second position acquisition means acquires the attribute and the second position wirelessly transmitted through the navigation monitoring automatic broadcast system for the target. The discrimination means identifies the substantial detection performance of the radar, and determines whether the attribute is appropriate for the detection performance, and the correlation between the first position and the second position in the detection performance range. The authenticity of the station or the transmission information is determined.

  That is, for any wireless station wirelessly transmitted via the navigation surveillance automatic broadcasting system, the authenticity is determined based not only on the comparison with the position detected by the radar but also on the attribute of the above-mentioned attribute for the detection performance of the radar. Is determined.

  The navigation wireless transmission device to which the present invention is applied is authentic without any change in the existing multiple access method or communication procedure by processing performed based on all or part of the information related to navigation. It is determined with high accuracy.

  In addition, the radio station to which the present invention is applied and accesses the navigation surveillance automatic broadcast system has improved performance and reliability without impairing conformity to the original specification and configuration.

  Furthermore, the radio station to which the present invention is applied and which accesses the navigation surveillance automatic broadcasting system has the performance and performance without any loss of compatibility with the original specification and configuration, and without significantly increasing the processing amount. Reliability is improved.

  Further, in the navigation monitoring automatic broadcasting system to which the present invention is applied, the load is reduced and the added value and the reliability are increased in the radio station that can perform the authenticity determination.

  Furthermore, the radio station to which the present invention is applied and accesses the navigation surveillance automatic broadcasting system can improve performance and reliability by effectively utilizing the radar detection performance.

  In addition, in the radio station to which the present invention is applied, it is possible to efficiently and accurately realize the true / false discrimination of the radio station to be inquired in cooperation with the navigation information discrimination device.

  Therefore, according to the navigation monitoring automatic broadcast system to which the present invention is applied, not only reliability and performance but also safety and convenience of navigation can be improved and maintained stably.

It is a figure which shows 1st embodiment of this invention. It is an operation | movement flowchart of the control part in 1st embodiment of this invention. It is a figure explaining operation | movement of 1st embodiment of this invention. It is a figure which shows 2nd embodiment of this invention. It is an operation | movement flowchart of the control part in 2nd embodiment of this invention.

It is a figure explaining operation | movement of 2nd embodiment of this invention. It is a figure which shows 3rd embodiment of this invention. It is an operation | movement flowchart of the discrimination | determination apparatus in 3rd embodiment of this invention. It is a figure explaining operation | movement of 3rd embodiment of this invention. It is a figure which shows the structural example of an AIS apparatus. It is a figure which shows the structure of the message transmitted by radio | wireless via AIS.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First embodiment]
FIG. 1 is a diagram showing a first embodiment of the present invention.
In this embodiment, AIS apparatuses 10A and 10B are provided in different ships A and B, respectively.
Ships A and B correspond to, for example, ships on which AIS devices serving as transmission ends and reception ends of AIS signals (messages) are individually mounted.

The configuration of the AIS device 10A is the same as that of the AIS device shown in FIG. 10 except that a control unit 11A is provided instead of the control unit 48. Note that the symbol “A” is appended to the end of the reference numerals of the constituent elements of the AIS apparatus 10A for distinction from the constituent elements of the AIS apparatus 10B.
Further, among the components of the AIS apparatus 10A, those having the same function and configuration as those shown in FIG. 10 are given the same reference numerals except that the symbol “A” is added at the end, and here, The description is omitted.

  The configuration of the AIS device 10B is the same as the configuration of the AIS device 10B. Therefore, the same reference numerals with the symbol “B” in place of the symbol “A” are added to the components of the AIS apparatus 10B, and the description thereof is omitted here.

FIG. 2 is an operation flowchart of the control unit in the first embodiment of the present invention.
FIG. 3 is a diagram for explaining the operation of the first embodiment of the present invention.
Hereinafter, the operation of this embodiment will be described with reference to FIGS. 1, 2, 3, and 11.

In the present embodiment, the feature of the present invention is that identification of a fake ship is realized by the AIS devices 10A and 10B linking as described later.
In the AIS device 10A, the control unit 11A performs the following processing.

(1) Along with the identification information IDA of the ship A, the position of the ship A given by a positioning sensor (not shown) via the collector 50 (the position obtained under the positioning calculation performed by the GPS receiver 47A is substituted). (Notification information) including the information (step S1 in FIG. 2, FIG. 3 (1)).
(2) All or part of the “notification information”, which is suitable as a criterion for determining the presence / absence (true / false) of the “notification information” or the ship A (hereinafter referred to as “reference information”). By encrypting with a known secret key, “encrypted information” is generated (step S2 in FIG. 2, FIG. 3 (2)).

(3) The “notification information” is transmitted as the class A position report (message 1) (FIG. 11 (b)) via the modem 45A and the transmitter 46A (FIG. 2, step S3, FIG. 3 (3)). .
(4) The “encrypted information” is transmitted as a binary broadcast message (message 8) (FIG. 11 (c)) via the modem 45A and the transmitter 46A (step S4 in FIG. 2, FIG. 3 (4)).

Note that the order, interval, and correspondence between the transmission of the class A position report and the binary broadcast message are defined based on a predetermined rule.
On the other hand, in the AIS device 10B, the control unit 11B performs the following processing.

(1) The “notification information” is received and stored by linking with the TDMA receiving unit 43B-1 (43B-2) and the modem unit 45B (step S5 in FIG. 2, FIG. 3 (5)).
(2) The “encrypted information” is received by linking with the TDMA receiving unit 43B-1 (43B-2) and the modem unit 45B (step S6 in FIG. 2, FIG. 3 (6)).

(3) The “reference information” is restored by decrypting the “encryption information” based on the public key that matches the above-described secret key (step S 7 in FIG. 2, FIG. 3 (7)).
(4) The “notification information” or the authenticity of the ship A is determined by correlating or collating the “notification information” with the “reference information” (step S8 in FIG. 2, FIG. 3 (8)). .

(5) The above-mentioned “notification information” is delivered to the operation display unit 60B through the collector / distributor 50B together with the binary information indicating the result of the determination (step S9 in FIG. 2, FIG. 3 (9)).
Here, the ship A is not a fake ship, and the AIS apparatus 10A is a regular AIS apparatus to which the present invention is applied.

  However, for example, an unauthorized AIS device that has illegally accessed the AIS by a personal computer or the like cannot obtain the secret key or public key, and therefore cannot transmit “encrypted information” as a binary broadcast message.

  Therefore, according to the present embodiment, existing hardware resources can be effectively used without losing conformity to specifications such as AIS original multiple access method, communication procedure, and message content / format. Thus, it is possible to easily identify the fake ship and determine whether the “notification information” is true or not without applying radio navigation or satellite navigation that requires a complicated and large amount of processing.

The secrecy of the “reference information” is not limited by the public key method described above, and may be realized by any configuration listed below, for example.
・ Adoption of common key method, secret key method, session key method, dongle (including keys that are calculated based on the result of timing synchronized with absolute time and give updated keys)

  In addition, the key applied for such encryption and decryption is given in advance as known information to the AIS devices 10A and 10B or secured if security such as confidentiality is ensured. It may be distributed as appropriate by a certification authority accessible via a communication path.

Furthermore, in the present embodiment, the “reference information” converted into “encryption information” may include any of the following:
・ A copy of all or part of “Notification Information” ・ Algorithm that should be applied to determine the authenticity of “Notification Information”

Further, the wireless transmission of “encrypted information” may be performed in any of the following forms.
(1) Rather than as a binary broadcast message (Message 8), transmission via a channel formed by the use of spare fields for various messages (including the adoption of bit stealing)

(2) Instead of encryption, or adopting “compression coding” applied in conjunction with encryption

  Furthermore, this embodiment is configured by software that is executed by the control units 11A and 11B and performs the above-described processing.

However, this embodiment may be configured as any of the following adapters interposed between the antenna 31AAIS (31BAIS) and the transponder as listed below.
(1) An adapter that performs demodulation of reception waves and modulation of transmission waves, and performs processing equivalent to the processing described above (steps S1 to S9 in FIG. 2) in the baseband region.

(2) The “reference information” is restored by extracting and decrypting the “encrypted information” received as the binary broadcast message (message 8) in the above-described processing (steps S1 to S9 in FIG. 2), An adapter that multiplexes the “reference information” to the received wave and delivers it to the transponder or directly delivers it to the control unit 11A (11B).

(3) Of the above-described processing (steps S1 to S9 in FIG. 2), “reference information” to be transmitted as a binary broadcast message (message 8) is directly superimposed on the transmission wave from the control unit 11A (11B). Is generated as a signal, and a binary broadcast message (message 8) indicating the “reference information” and a corresponding radio packet signal are generated, and the antenna 31AAIS is generated in the same manner as a burst-like transmission wave indicating other messages. Adapter that transmits via (31BAIS)

[Second Embodiment]
FIG. 4 is a diagram showing a second embodiment of the present invention.
In the figure, components having the same functions and configurations as those shown in FIG. 10 are given the same reference numerals, and descriptions thereof are omitted here.

The configuration of the present embodiment is different from the configuration of the conventional example shown in FIG. 10 in the following points, as shown in FIG.
(1) A control unit 12 is provided instead of the control unit 48.
(2) A proxy server 13 is provided which is connected to a predetermined communication port of the control unit 12 and is used for accessing the Internet via the wireless LAN.

(3) On the above Internet, an operation management database (not shown) individually provided to a reliable organization such as a ship operation management company or a ship company is provided via a dedicated communication path or a secure communication path. A database 14 to be accessed is arranged.

FIG. 5 is an operation flowchart of the control unit in the second embodiment of the present invention.
FIG. 6 is a diagram for explaining the operation of the second embodiment of the present invention.
Hereinafter, the operation of this embodiment will be described with reference to FIGS. 4, 5, and 6.

The database 14 appropriately accumulates and accumulates the operation plans registered in the operation management database for the individual ships belonging to the shipping company.
On the other hand, the control unit 12 transmits “notification information” (for example, “class A position report”) wirelessly transmitted from an AIS device mounted on another ship and restored by the TDMA 43-1 (43-2) and the modem unit 45. When (Message 1) "is captured, the following processing is performed.

(1) The MMSI number, latitude, longitude, etc. included in the “notification information” are extracted (step S1, FIG. 6 (1) in FIG. 5).
(2) An “inquiry” including the MMSI number and the current time T is generated (step S2 in FIG. 5, FIG. 6 (2)).

(3) The “inquiry” is transmitted to the database 14 via the proxy server 13 and the Internet (step S3 in FIG. 5, FIG. 6 (3)).
(4) In response to this “inquiry”, the operation plan transferred as a response from the database 14 is acquired (step S4 in FIG. 5, FIG. 6 (4)). In addition, when such an operation plan cannot be acquired, processes (5) to (7) described later are omitted.

(5) Under this operation plan, the corresponding other ship identifies the water area that should be located at the above time T (step S5 in FIG. 5, FIG. 6 (5)).
(6) It is determined whether or not the latitude and longitude coincide with the water area with a predetermined accuracy, and binary information indicating the determination result is generated (step S6 in FIG. 5, FIG. 6 (6)).
(7) The above-mentioned “notification information” is delivered to the operation display unit 60 via the collector / distributor 50 together with such binary information (step S7 in FIG. 5, FIG. 6 (7)).

  Therefore, according to the present embodiment, existing hardware resources can be effectively used without impairing conformity to specifications such as the original multiple access method, communication procedure, and message content / format of AIS. Without the need for complicated and large-capacity radio navigation or satellite navigation, it is simple and highly accurate based on reliable operation plans, and it is possible to identify fake ships and authenticity of “notification information” Realized.

  In the present embodiment, the criterion for authenticity determination regarding the “notification information” and the ship that has transmitted the “notification information” is not limited only to the correlation between the water area and the latitude and longitude described above. When the degree of strictness should be set to a desired level among a plurality of levels, the items to be included in the operation plan and the “inquiry” and their accuracy are suitably set, and the operation display unit 60 and the like May be switched as appropriate in accordance with an instruction given by the user via.

  Further, the items and importance to be included in such a standard may reflect the attributes of the sea area where the corresponding ship is located, such as the degree of congestion of navigation, the likelihood of pirates to appear and disappear, and the like.

  Further, when there are a large number of these items, the binary information may be obtained as a magnitude relationship between the sum of products of weights indicating the importance and deviations for each item and a predetermined threshold value.

  Moreover, such a threshold value is not limited to a predetermined constant, For example, a user may perform a setting or update suitably, or may be calculated | required or updated as a value suitable for the attribute of the said water area.

Furthermore, the inquiry and response to the database 14 may be realized in any of the following forms, for example.
(1) Web service
(2) Direct access to the database provided by the aforementioned ship operation management company or ship company without going through the database 14
(3) Utilization of binary broadcast messages (Message 8) that can be transferred without going through the Internet

Moreover, when acquisition of an operation plan is performed as the said binary broadcast message (message 8), this embodiment may be comprised as all the following or arbitrary combinations.
(1) The database 14 is incorporated in a land station capable of transmitting / receiving a binary broadcast message (message 8), or accessed by the land station via the Internet.
(2) When the amount of information in the operation plan is large (can be large), compression coding is performed in conjunction with or in place of encryption.

  Furthermore, such an operation plan is downloaded to the main memory or the external memory of the control unit 12 in order to cope with a situation in which the vessel subject to authenticity determination or the situation where “notification information” does not change rapidly. Or may be cached.

  In the present embodiment, as described above, the software executed by the control unit 12 is incorporated as a coprocessor or package linked with the control unit 48 shown in FIG. You may be comprised as an apparatus which raises the accuracy of identification of the fake ship by other AIS transponders.

  Further, in the present embodiment, the form of linkage (function distribution or load distribution) between the control unit 12 and the database 14 is not limited to the above-described form, and a communication path necessary for the linkage between the two is secured. Any transmission rate or real-time property required for the communication path may be realized.

Furthermore, in each of the above-described embodiments, a ship that is a target of authenticity determination such as “notification information” may be any of the following ships.
(1) A ship designated by an operator who operates the operation display unit 60
(2) Ships whose location was notified (most recently)

[Third embodiment]
FIG. 7 is a diagram showing a third embodiment of the present invention.
In the figure, components having the same functions and configurations as those shown in FIG. 10 are given the same reference numerals, and descriptions thereof are omitted here.
The configuration of the present embodiment is different from the configuration of the conventional example shown in FIG. 10 in the following points as shown in FIG.
(1) A radar device 70 is provided.
(2) The output of the radar device 70 is connected to the first port of the discrimination device 80.
(3) A specific output port of the collector / distributor 50 is connected to the second port of the determination device 80, and the instruction device 90 is connected to the output of the determination device 80.

FIG. 8 is an operation flowchart of the determination device according to the third embodiment of the present invention.
FIG. 9 is a diagram for explaining the operation of the third embodiment of the present invention.
Hereinafter, the operation of the present embodiment will be described with reference to FIG. 7, FIG. 8, and FIG.

The radar apparatus 70 is mounted on a ship together with the transponder 40, detects individual ships located in the vicinity of the ship, an instruction image indicating the result of the detection, and a substantial coverage of the radar apparatus 70 at that time (It also means whether or not the radar device 70 is operating normally) is sequentially delivered to the discrimination device 80 (FIG. 9 (1)).
Such an instruction image includes the following information.

(1) Radar image information V displayed as a general instruction image
(2) Positions for each ship to be displayed on the radar image information V (hereinafter referred to as “other ship position information”) p1 to pn

It is assumed that such other ship position information p1 to pn is a pair of latitude and longitude calculated based on the following items.
・ Location of own ship ・ Direction of bow of own ship ・ Range of range where radar device 70 should detect target

On the other hand, each part of the transponder 40 is “notification information” (class A position report (message 1)) notified from another ship which is a transmission end (other ship) for each radio signal arriving at the antenna 31AIS, as in the conventional example. ) I _{1 to} I _N are identified (FIG. 9 (2)). The control unit 48 sequentially delivers the notification information I _{1 to} I _N to the determination device 80 via the collector 50 (FIG. 9 (3)).

The determination device 80 performs the following processing.
(1) Of the notification information I _{1 to} I _N , the location information included in the notification information I ₁ ′ to the water area (also included in the covered area) to be displayed on the instruction screen of the pointing device 90 I _m ′ is extracted (step S1 in FIG. 8, FIG. 9 (4)).
(2) Among the notification information I ₁ ′ to I _m ′, the instruction screen is overlapped on the time axis as a result of target detection on the time axis, or obtained within a predetermined predetermined period. The notification information i ₁ ′ to i _m ′ is specified (step S2 in FIG. 8, FIG. 9 (5)).

(3) A column of position information (latitude and longitude) individually included in the notification information i ₁ ′ to i _m ′ is extracted (step S3 in FIG. 8, FIG. 9 (6)).
(4) Among the above-mentioned other ship position information p1 to pn, “specific other ship position information” whose “correlation” with any of the position information thus extracted exceeds a predetermined upper limit value is identified ( FIG. 8 step S4, FIG. 9 (7)).

(5) One of the ship corresponding to any of the above “specific ship position information” (hereinafter referred to as “true ship”) and “false ship” not corresponding to such “true ship”. Each ship to be displayed as a target on the radar image V is identified (step S5 in FIG. 8, FIG. 9 (8)).

(6) Among the combinations of the following display attributes, each ship displayed on the radar image V can be easily distinguished visually by whether it is “true ship” or “fake ship”. A suitable combination is applied to the radar image V (step S6 in FIG. 8, FIG. 9 (9)).

・ The presence or absence of the line type, thickness, color, shape, presence / absence of all or part of the symbol (for example, “△” mark) indicating the position of the ship and the bow direction of the ship. , Form of modification (for example, superimposition of a mark such as “?”) (Color, shading, or pattern may be used)
・ Attached to the above symbols, fonts, colors, font variations (italic, bold, long, flat, bag, etc.) indicating all or part of the “MMSI number”, “call sign”, “ship name”, etc. Character, inversion and its form) etc.

・ Shadow, three-dimensional effect, presence / absence and form of flashing ・ Presence / absence and level of luster and target part ・ Marks and characters that suggest (implicit) the presence / absence and degree of uncertainty ・ Correlation as described in section (4) above ”Or a character or image indicating the degree of“ probability of being a fake ship ”

  In addition, when a ship that seems to be a “fake ship” is positioned on the radar image V by such a display attribute, a voice message and / or an alarm sound are emitted in parallel. May be.

  Therefore, according to the present embodiment, the resources of the radar apparatus can be effectively utilized without impairing the conformity to specifications such as the original multiple access method, communication procedure, and message content / format of AIS, Complex and costly radio navigation and satellite navigation are not applied, and false ship identification and true / false discrimination of “notification information” can be realized easily and accurately without relying on visual inspection of the instruction screen. Is done.

  In addition, according to the present embodiment, the result of the determination as to whether or not it is a fake ship is automatically displayed on the instruction screen as a difference in display attributes, so that operation in a water area (sea area) where many ships are densely packed Is easily possible.

  Further, according to the present embodiment, in a state where the AIS is functioning normally, it is possible to determine whether or not the radar device 70 is operating normally, and to detect a water area or region where the radar device 70 can detect a target. It is possible to determine whether or not.

In the present embodiment, the other ship position information p1 to pn described above is obtained under image processing performed on the radar image information V by the radar device 70 and its geographical mapping.
However, these other ship position information p1 to pn may be obtained by processing such as target tracking performed by the radar device 70 or the like.

  In the present embodiment, the identification of the “specific other ship position information” includes, for example, the attribute of the corresponding other ship notified as the notification information such as “physical size of other ship”, the radar Appropriateness or contradiction with the substantial detection performance of the device 70 and the coverage may be taken into consideration.

  Further, in each of the above-described embodiments, the “notification information” and the criteria for determining whether the ship is true or false are classified into a plurality of classes (for example, “fully trustworthy”, “substantially trustworthy”, “trustworthy”, In the case where it is set to be classified as “suspected”, “substantially suspicious”, “completely suspicious”, etc.), for example, according to an instruction given by the operator via the operation display unit 60 or a control unit 48, 11A, 11B, 12 or a predetermined process performed by the determination device 80 may be set as appropriate.

  Further, targets such as ships to be included in the radar image information V are limited to “any combination of classes” (for example, only suspicious ships) according to an instruction given by the operator among the above classes. ) May be set.

  Further, in the present embodiment, the determination device 80 may be incorporated in one of the transponder 40 and the radar device 70, or may be incorporated in a distributed manner.

  In addition, the functions of the discriminating device 80, the transponder 40, and the radar device 70 and the form of load distribution may be any.

  Further, in the present embodiment, the processing performed by the control unit 48 and the discriminating device 80 is performed by, for example, a coprocessor or package linked to the control unit 48, so that the conventional AIS transponder or other AIS transponders It may be configured as an “apparatus for improving the accuracy of identification of a fake ship”.

  In addition, such “determination of the presence or absence of other ships and their accuracy” can be achieved by, for example, combining the invention according to the application on the same day as the present application and all or a part of each of the above-described embodiments with higher accuracy. It may be realized.

  Further, in each of the above-described embodiments, the transmitting end of the incoming received wave is not limited to the ship station, but may be an AIS transponder mounted on a land station, a buoy or the like.

Moreover, in each embodiment mentioned above, this invention is applied to AIS applied to a ship station or a land station.
However, the present invention is not limited to such an AIS, and can be similarly applied to any system or apparatus described below.

(1) “Artificial Satellite AIS” that can monitor the navigational status of ships on the ocean that are more than 80 kilometers away from the coast by installing an AIS receiver in an artificial satellite orbiting in a low orbit.

(2) AIS transponders mounted on aircraft that search and monitor at sea
(3) Broadcast Dependent Surveillance-Broadcast (ADS-B): An aircraft constantly reports its position and altitude to other aircraft and ground stations.

  Furthermore, the configuration of each embodiment described above is not limited to the above-described configuration, and if the characteristic processing and function of the present invention are realized, the configuration of hardware and software, the function and load of each unit, and the like. Any of the forms of dispersion may be used.

  The present invention is not limited to the above-described embodiments, and various configurations can be made within the scope of the present invention, and any improvements may be made to all or some of the components.

11, 11A, 11B, 48 Control unit 31AIS, 31GPS antenna 40 Transponder 41 (SW) Switch 42 (H) Hybrid 43 TDMA reception unit 44 DSC reception unit 45 Modulation / demodulation unit 46 Transmission unit 47 GPS reception unit 50 Concentrator / distributor 60 Operation display unit

Claims (2)

First position acquisition means for acquiring a first position of a target that is detected by a radar or that is a tracking target linked to the radar;
Second position acquisition means for acquiring a second position wirelessly transmitted through the navigation monitoring automatic broadcast system for the target;
Discriminating means for identifying a substantial coverage area of the radar and determining whether the radio station or the transmission information is true or false as a correlation between the first position and the second position in the coverage area; A navigation information discriminating apparatus characterized by comprising: First position acquisition means for acquiring a first position of a target that is detected by a radar or that is a tracking target linked to the radar;
Second position acquisition means for acquiring the attribute and the second position wirelessly transmitted through the navigation monitoring automatic broadcast system for the target;
Identifying substantial detection performance of the radar, whether the attribute is appropriate for the detection performance, and the correlation between the first position and the second position in the range of the detection performance, the wireless station or the transmission A navigation information discrimination device comprising: discrimination means for discriminating whether information is true or false.