Target information display device, target information display method, and program

Abstract

To provide a target information displaying device capable of easily selecting a symbol.SOLUTION: A target information displaying device comprises: an operating unit capable of detecting two operating directions with respect to an operator; a data acquisition unit that acquires target data representing positions of a plurality of targets existing around the own ship; a display control unit that generates a display image in which a plurality of symbols representing the plurality of targets are plotted in correspondence with the positions of the plurality of targets based on the target data, and outputs the display image to a display unit; a selection order determination unit that determines a selection order of the targets based on a predetermined order along a bow direction of the own ship; and a selection control unit that switches a selected symbol among the plurality of symbols according to the selection order according to an operation direction detected by the operating unit.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a target information display device, a target information display method, and a program. [Background technology]

[0002] Patent Document 1 discloses an Automatic Identification System (AIS) that allows a user to select target icons in order of proximity or furthest distance on a plotter-type display screen by operating the left and right keys. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-175512 Summary of the Invention [Problem to be solved by the invention]

[0004] However, using a cross key or other device to move a cursor on a screen to select a symbol is a time-consuming and difficult task that makes it difficult to make fine adjustments. Also, trackballs, which are relatively easy to operate, are equipped on relatively expensive models and are not used in inexpensive models.

[0005] Furthermore, Patent Document 1 describes that on a plotter-type display screen, target icons are selected in order of proximity when the right key on the cross key is operated, and target icons are selected in order of distance when the left key is operated. However, since the selection order is determined only by the distance from the ship, there is a problem in that it is difficult to intuitively select targets that require attention.

[0006] The present invention has been made in view of the above-mentioned problems, and a main object of the present invention is to provide a target information display device, a target information display method, and a program that allow easy symbol selection. [Means for solving the problem]

[0007] In order to solve the above problem, one aspect of the present invention provides a target information display device that includes an operation unit that can detect two operation directions of a control, a data acquisition unit that acquires target data representing the positions of multiple targets around the ship, a display control unit that generates a display image in which multiple symbols representing the multiple targets are plotted corresponding to the positions of the multiple targets based on the target data, and outputs the display image to a display unit, a selection order determination unit that determines a selection order of the targets based on a predetermined order along the bow direction of the ship, and a selection control unit that switches a selected symbol among the multiple symbols in accordance with the selection order in response to the operation direction detected by the operation unit, thereby facilitating symbol selection.

[0008] In the above aspect, the target data may be AIS data, and the data acquisition unit may acquire the AIS data. This makes it possible to display a symbol based on the AIS data.

[0009] In the above aspect, the selection order determination unit may determine the selection order of the targets based on the distance from the ship in the bow direction of the ship. Also, the selection order determination unit may assign a higher selection order to targets closer to the ship in the bow direction of the ship. This makes it possible to preferentially select targets closer to the ship.

[0010] In the above aspect, the selection order determination unit may organize the targets into a plurality of groups, determine a selection order for the groups, and determine the selection order for the targets for each group based on the distance from the ship to the ship in the bow direction of the ship. This makes it possible to determine the selection order for the groups and further determine the selection order for the targets for each group.

[0011] In the above aspect, the selection order determination unit may organize the targets into a forward group located forward of the ship and a rear group located rearward of the ship, and set the selection order of the forward group higher than the selection order of the rear group. This makes it possible to preferentially select targets in the forward group.

[0012] In the above aspect, the AIS data may include information on the heading direction of the target, and the selection order determination unit may organize the targets into a same direction traveling group traveling in the same direction as the ship and an opposite direction traveling group traveling in the opposite direction to the ship, and may give the opposite direction traveling group a higher selection priority than the opposite direction traveling group. This makes it possible to preferentially select targets in the opposite direction traveling group.

[0013] In the above aspect, the AIS data may include information on the bow direction of the target, and the selection order determination unit may organize the targets into a group approaching the ship and a group moving away from the ship, and may prioritize the selection of the group approaching the ship over the selection of the group moving away from the ship. This makes it possible to preferentially select targets in the group approaching the ship.

[0014] In the above aspect, the selection order determination unit may organize the targets into a group whose lateral distance to the ship is within a predetermined range and a group whose lateral distance to the ship is equal to or greater than a predetermined range, and may give the selection order of the group whose lateral distance to the ship is equal to or greater than the predetermined range lower than the selection order of the group whose lateral distance to the ship is within the predetermined range, or may exclude the group. This makes it possible to postpone or not select the group whose lateral distance to the ship is equal to or greater than the predetermined range.

[0015] In the above aspect, the AIS data may include information on the speed of the target, and the selection order determination unit may organize the target into a group whose speed is less than a predetermined value and a group whose speed is equal to or greater than the predetermined value, and may rank the group whose speed is less than the predetermined value lower in selection order than the group whose speed is equal to or greater than the predetermined value, or may exclude the group whose speed is less than the predetermined value. This makes it possible to postpone or not select the group whose speed is less than the predetermined value.

[0016] In the above aspect, the selection order determination unit may allow a user to set the selection order of the groups, thereby making it possible to receive the selection order of the groups from the user.

[0017] In the above aspect, the selection control unit may switch the selection state to ascending order of the selection order when a first operation direction is detected, and switch the selection state to descending order of the selection order when a second operation direction is detected, thereby making it easier to select symbols.

[0018] In the above aspect, the operator may be a rotary operator, which makes it easier to operate for selecting a symbol.

[0019] In the above aspect, the vehicle may further include a radar antenna and a signal processing unit that processes echo signals received by the radar antenna.

[0020] In the above aspect, the display unit may have a vertically long screen and display the display image with the bow of the ship facing up, which is suitable for use in waterways such as rivers where ships travel in a fixed direction.

[0021] Another aspect of the target information display method of the present invention generates target data representing the positions of multiple targets around the ship, outputs a display image to a display unit in which multiple symbols representing the multiple targets are plotted corresponding to the positions of the multiple targets based on the target data, determines a selection order for the targets based on a predetermined order along the bow direction of the ship, and switches a selected symbol from among the multiple symbols according to the selection order in response to the operation directions detected by an operation unit capable of detecting two operation directions for an operator. This makes it easy to select symbols.

[0022] According to another aspect of the present invention, a program causes a computer to acquire target data representing the positions of multiple targets around the ship, generate a display image based on the target data by plotting multiple symbols representing the multiple targets in correspondence with the positions of the multiple targets, determine a selection order for the targets based on a predetermined order along the bow direction of the ship, and switch a selected symbol among the multiple symbols according to the selection order in response to two operation directions detected by an operation unit capable of detecting two operation directions for an operator. This facilitates symbol selection. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 2 is a diagram showing an external view of a target information display device. [Figure 2] FIG. 2 is a block diagram showing a configuration example of a target information display device. [Figure 3] FIG. 2 is a block diagram showing a configuration example of a control unit of the target information display device. [Figure 4] FIG. 2 is a diagram showing an example of the contents of a target management DB. [Figure 5A] FIG. 10 is a diagram for explaining a selection order. [Figure 5B] FIG. 10 is a diagram for explaining a selection order. [Figure 6] FIG. 10 is a diagram for explaining a display image. [Figure 7]FIG. 10 is a diagram illustrating an example of a procedure for a target information display method. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0025] Fig. 1 is an external view showing an example of the configuration of the target information display device 1. Fig. 2 is a block diagram showing an example of the configuration of the target information display device 1. Fig. 3 is a block diagram showing an example of the configuration of a control unit 10 included in the target information display device 1.

[0026] In this embodiment, the target information display device 1 is configured as a ship radar. In particular, the target information display device 1 is configured as a river radar mounted on a ship navigating a river. In the following description, the ship on which the target information display device 1 is mounted is referred to as the "own ship," and other ships are referred to as the "other ships."

[0027] As shown in FIG. 2, the target information display device 1 includes a control unit 10, an operation unit 2, a display unit 3, a radar antenna 4, an AIS receiver 5, a GNSS receiving unit 6, and a GNSS compass 7.

[0028] The control unit 10 is a computer including a CPU, RAM, ROM, nonvolatile memory, an input / output interface, etc. The CPU of the control unit 10 executes processing in accordance with a program loaded from the ROM or nonvolatile memory to the RAM.

[0029] The program may be supplied via an information storage medium such as an optical disk or a memory card, or may be supplied via a communication network such as the Internet or a LAN.

[0030] The radar antenna 4 transmits radio waves around the ship and receives their echoes. Based on the echo signals received by the radar antenna 4, the control unit 10 generates echo data that indicates the echo intensity at each direction and distance relative to the ship.

[0031] The control unit 10 generates a radar image based on the echo data or a composite image combining the radar image and an electronic nautical chart as a display image, and outputs it to the display unit 3. The display image includes target symbols that represent targets present around the ship. The targets are mainly other ships.

[0032] The AIS (Automatic Identification System) receiver 5 receives AIS data from other ships around the ship or from land-based control. The AIS data includes the identification codes, ship names, positions, courses, speeds, ship types, ship lengths, and destinations of other ships. The AIS data is an example of target data. Instead of AIS, a VHF Data Exchange System (VDES) may also be used.

[0033] The GNSS receiver 6 detects the position of the ship based on radio waves received from the GNSS (Global Navigation Satellite System), and the GNSS compass 7 detects the heading of the ship.

[0034] 1, the operation unit 2 includes a rotary operation device 21 and a cross operation device 22 (a so-called cross key). The operation unit 2 can detect two mutually opposite operation directions for the rotary operation device 21 or the cross operation device 22.

[0035] Specifically, the operating unit 2 is equipped with a rotary encoder (not shown) that detects the rotation of the rotary operator 21, and is capable of detecting two operating directions relative to the rotary operator 21: a clockwise direction (an example of a first operating direction) and a counterclockwise direction (an example of a second operating direction).

[0036] The operation unit 2 also includes a plurality of switches (not shown) that detect pressing of the cross operator 22, and is capable of detecting two operation directions, an upward direction (an example of a first operation direction) and a downward direction (an example of a second operation direction) for the cross operator 22. It is also capable of detecting two operation directions, a leftward direction (an example of a first operation direction) and a rightward direction (an example of a second operation direction) for the cross operator 22.

[0037] However, the operation unit 2 may detect the operation of a scroll wheel provided on a mouse or the like in two rotation directions.

[0038] The display unit 3 is, for example, a liquid crystal display device or an organic EL display device, etc. In this embodiment, the display unit 3 has a vertically long screen 31, and displays a so-called heading-up display image, in which the bow of the ship is facing up.

[0039] However, using a cross key or the like to move the cursor over a symbol moving on the screen and select it is a time-consuming and difficult task that makes it difficult to make fine adjustments. In particular, it is extremely difficult to make fine adjustments to the cursor position on the screen using a cross key, which is often used in inexpensive devices. In addition, trackballs, which are relatively easy to operate, are equipped on relatively expensive models and are not used in inexpensive models.

[0040] To point correctly, the user must first visually recognize the symbol's position, then manually adjust the cursor position while constantly following the moving symbol. Even if the user points correctly, the symbol may move away from the cursor before the selection operation is completed, which can lead to an incorrect operation.

[0041] Therefore, in this embodiment, as described below, the symbol selection is facilitated by switching the selected symbol among multiple symbols according to the target selection order based on a predetermined order along the bow direction of the ship, depending on the operation direction detected by the operation unit 2.

[0042] 3, the control unit 10 includes a signal processing unit 11, a data acquisition unit 12, a selection order determination unit 13, a display control unit 14, and a selection control unit 15. These functional units are realized by the CPU of the control unit 10 executing processes in accordance with a program.

[0043] The control unit 10 further includes a target management DB (database) 19. The target management DB 19 is constructed in the memory of the control unit 10.

[0044] The signal processing unit 11 processes the echo signal received by the radar antenna 4 and outputs the processed signal to the display control unit 14. The signal processing unit 11 is a functional unit that realizes the function of a radar.

[0045] The data acquisition unit 12 acquires the AIS data from the AIS receiver 5 as target data, and registers the acquired target data in the target management DB 19.

[0046] The selection order determination unit 13 determines the selection order of the target data registered in the target management DB 19. The algorithm for determining the selection order may be set by the user. The selection order determination unit 13 also acquires the ship's position and heading from the GNSS receiver 6 and / or the GNSS compass 7.

[0047] The display control unit 14 generates a display image in which a plurality of target symbols representing a plurality of targets are plotted based on the target data registered in the target management DB 19, and outputs the generated image to the display unit 3.

[0048] The selection control unit 15 switches the target symbols in the selected state according to the selection order determined by the selection order determination unit 13 in accordance with the operation direction detected by the operation unit 2.

[0049] The determination of the selection order by the selection order determination unit 13, the display images generated by the display control unit 14, and the switching of the selection state by the selection control unit 14 will be described in detail below.

[0050] 4 is a diagram showing an example of the contents of the target management DB 19. The target management DB 19 includes fields such as "identification number," "position," "heading direction," "speed," and "selection order."

[0051] 5A and 5B are diagrams for explaining the determination of the selection order by the selection order determination unit 13. These diagrams show the positional relationship between the own ship SS and multiple targets SH (other ships SH), and show a large number of ships passing through a narrow waterway such as a river. The X direction in the diagrams represents the beam direction of the own ship SS, and the Y direction represents the bow direction of the own ship SS.

[0052] Figures 5A and 5B show many ships passing through a narrow sea lane, such as a river. The ships are traveling almost in a line on the right side of the sea lane. The letter L in Figure 5B represents the sea lane, such as the edge of a river. Ships outside the sea lane are often stationary.

[0053] The selection order determination unit 13 determines the selection order of the targets SH. In Figures 5A and 5B, each target SH is given a circled number indicating the selection order. The selection order of the targets SH is determined to be an order along the bow direction (Y direction) of the host ship SS, specifically, an order according to the distance in the Y direction from the host ship SS.

[0054] 5A, the selection order determination unit 13 ranks the targets SH located ahead of the host ship SS (circle 1 to circle 6) in the selection order before the targets SH located behind the host ship SS (circle 7 to circle 10). In addition, the selection order determination unit 13 ranks the targets SH located ahead of the host ship SS in order of proximity to the host ship SS (circle 1 to circle 6), and ranks the targets SH located behind the host ship SS in order of proximity to the host ship SS (circle 7 to circle 10).

[0055] As shown in the example of Figure 5B, the selection order determination unit 13 may determine the selection order by dividing targets SH navigating the traffic lane into the following four groups: a first group traveling in the opposite direction from the host ship SS and positioned ahead of the host ship SS, a second group traveling in the same direction as the host ship SS and positioned behind the host ship SS, a third group traveling in the same direction as the host ship SS and positioned ahead of the host ship SS, and a fourth group traveling in the opposite direction from the host ship SS and positioned behind the host ship SS.

[0056] For example, the selection order determination unit 13 ranks targets SH approaching the host ship SS before targets SH moving away from the host ship SS. If the speed of the host ship SS is relatively slow, the targets SH in the second group will move toward the host ship SS, and the targets SH in the third group will move away from the host ship SS. In such a case, the targets SH belonging to the first and second groups (circled 1 to 5 in FIG. 5) will be ranked higher than the targets SH belonging to the third and fourth groups (circled 6 to 10) that are moving away from the host ship. This allows targets SH that are of high interest to the user and are moving toward the host ship SS to be selected preferentially.

[0057] Furthermore, the selection order determination unit 13 prioritizes the targets SH (circle 1 to circle 3) belonging to the first group located ahead of the host ship SS among the first and second groups moving in a direction approaching the host ship SS, ahead of the targets SH (circle 4 to circle 5) belonging to the second group located behind the host ship SS. This allows targets SH located ahead of the host ship SS, which are of greater interest to the user and therefore have a higher collision risk, to be selected preferentially.

[0058] Furthermore, the selection order determination unit 13 prioritizes the targets SH (circles 6-8) belonging to the third group located ahead of the ship SS, among the third and fourth groups moving away from the ship SS, above the targets SH (circles 9-10) belonging to the fourth group located behind the ship SS. This allows targets SH located ahead of the ship SS, which are of greater interest to the user and therefore present a higher risk of collision, to be selected preferentially.

[0059] The priority of the first to fourth groups, i.e., which group is to be selected first in the selection order, is not limited to the above example. The selection order determination unit 13 may change the priority of the first to fourth groups in response to a setting made by the user. Furthermore, the classification of groups is not limited to these, and groups moving in the same direction as the ship and groups moving in the opposite direction to the ship may also be used. Furthermore, it is possible to subdivide groups to create multiple groups and assign priorities to each group.

[0060] In addition to the above-mentioned first to fourth groups, there are also targets SH that are stopped near the edge of the sea lane L. In the selection order, the selection order determination unit 13 may rank targets SH (circles 11 to 15) whose distance in the beam direction (X direction) to the host ship SS is greater than or equal to a predetermined distance after ranks of targets SH (circles 1 to 10) whose distance is less than the predetermined distance. Furthermore, the selection order determination unit 13 may exclude from the selection order the ranks of targets SH (circles 11 to 15) whose distance in the beam direction (X direction) to the host ship SS is greater than or equal to a predetermined distance.

[0061] Furthermore, the selection order determination unit 13 may rank targets SH whose speed is less than a predetermined speed (circled 11 to circled 15) after targets SH whose speed is equal to or greater than a predetermined speed (circled 1 to circled 10) in the selection order, i.e., rank targets SH whose speed is equal to or greater than a predetermined speed after targets SH whose speed is less than a predetermined speed. Furthermore, the selection order determination unit 13 may exclude targets SH whose speed is less than a predetermined speed (circled 11 to 15) from the selection order.

[0062] 6 is a diagram illustrating an example of a display image generated by the display control unit 14. The display control unit 14 sequentially generates display images and outputs a moving image including time-series display images to the display unit 3.

[0063] The own ship symbol BS representing the own ship is placed, for example, in the center of the display image. The own ship symbol BS does not have to be placed. The X direction in the figure represents the ship's beam direction, and the Y direction represents the ship's bow direction.

[0064] In the display image, a target symbol BH representing a target is arranged corresponding to the position of the target. That is, the target symbol BH is arranged at a position in the image corresponding to the actual position of the target (the coordinates registered in the "position" field of the target management DB 19).

[0065] Furthermore, the target symbol BH has, for example, a triangular shape indicating the bow direction of the target (the direction registered in the "bow direction" of the target management DB 19). The target symbol BH is not limited to this, and may be, for example, a circle. A line indicating the bow direction may be added to the target symbol BH.

[0066] The display image is, for example, a radar image. For the sake of explanation, echoes are not shown in the display image shown in FIG.

[0067] The display control unit 14 displays a target symbol BHa that is in a selected state among a plurality of target symbols BH in a manner that distinguishes it from the other target symbols BH. Specifically, the display control unit 14 differentiates the color, shape, size, etc. of the selected target symbol BHa from the other target symbols BH. In addition, the display control unit 14 displays a frame FL that surrounds the selected target symbol BHa.

[0068] The display control unit 14 further displays an information window FM including a character string indicating information about the target corresponding to the selected target symbol BHa. The information window FM includes various information such as the position, heading direction, and speed of the target registered in the target management DB 19. The information window FM is arranged, for example, on the periphery of the display image DM.

[0069] 7 is a diagram showing an example of the procedure of the target information display method realized in the target information display device 1. The diagram mainly shows the process related to switching the selection state of the target symbol BH. The control unit 10 of the target information display device 1 executes the process shown in the diagram according to a program.

[0070] First, the control unit 10 determines whether or not an operation on the rotary operator 21 (see FIG. 1) has been detected (S11, S12).

[0071] If a clockwise operation of the rotary operator 21 is detected (S11: YES), the control unit 10 switches the selection state of the target symbol BH to ascending order (lowest number first) of the selection order registered in the target management DB 19 (S13, processing as the selection control unit 15).

[0072] On the other hand, if a counterclockwise operation of the rotary operator 21 is detected (S11: NO, S12: YES), the control unit 10 switches the selection state of the target symbol BH to descending order (highest number first) of the selection order registered in the target management DB 19 (S14, processing as the selection control unit 15).

[0073] Next, the control unit 10 updates the identification display of the target symbol BH in the selected state (S15, processing as the display control unit 14). That is, the control unit 10 ends the identification display of the target symbol BH that was in the selected state up until then, and starts the identification display of the target symbol BH that is newly in the selected state.

[0074] Next, the control unit 10 updates the information display of the target symbol BH in the selected state (S16, processing as the display control unit 15). That is, the control unit 10 erases the information of the target symbol BH that was in the selected state up until then from the information window FM, and displays the information of the target symbol BH that is now in the newly selected state in the information window FM.

[0075] The above process is repeated while the display device 3 displays the display image DM including the target symbol BH.

[0076] According to this embodiment, the operation of moving the cursor on the screen to a symbol to select it is no longer necessary, and the selection state of the target symbol BH is switched depending on the operation direction detected by the operation unit 2, making it easy to select the target symbol BH.

[0077] In this embodiment, the selection state of the target symbol BH is switched in response to the detection of clockwise and counterclockwise operation of the rotary control 21, but this is not limited to this. For example, the selection state of the target symbol BH may be switched in response to the detection of upward and downward operation of the cross control 22.

[0078] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made by those skilled in the art.

[0079] In the above embodiment, an example was described in which the target information display device 1 was configured as a ship radar, but this is not limited to this, and the target information display device 1 may also be configured as a plotter device that displays target symbols based on AIS data.

[0080] Furthermore, the functional units (functional units 11-15 in FIG. 3) related to the target information display of the target information display device 1 may be realized by a device independent of the radar device or the plotter device. Furthermore, the target information display device 1 and the display unit 3 may be devices independent of each other.

[0081] In the above embodiment, AIS data is used as target data and a target symbol based on the AIS data is displayed, but this is not limited to this. Target tracking data (TT data) recognized from echo data may be used as target data and a target symbol based on the TT data may be displayed. [Explanation of symbols]

[0082] 1 Target information display device, 2 Operation unit, 21 Rotation control, 22 Cross control, 3 Display unit, 31 Screen, 4 Radar antenna, 5 AIS receiver, 6 GNSS receiving unit, 7 GNSS compass, 11 Signal processing unit, 12 Data acquisition unit, 13 Selection order determination unit, 14 Display control unit, 15 Selection control unit, 19 Target management DB, SS Own ship, SH Target, BS Own ship symbol, BH Target symbol, FM Information window

Claims

1. an operation unit capable of detecting two operation directions of an operation element; a data acquisition unit that acquires target data representing the positions of multiple targets present around the ship; a display control unit that generates a display image in which a plurality of symbols representing the plurality of targets are plotted in correspondence with positions of the plurality of targets based on the target data, and outputs the generated display image to a display unit; a selection order determination unit that determines a selection order of the targets based on the distances from the position of the ship to the positions of the multiple targets at the same time in the bow direction of the ship; a selection control unit that switches a selected symbol among the plurality of symbols in accordance with the selection order in response to the operation direction detected by the operation unit; A target information display device comprising:

2. The target data is AIS data, The data acquisition unit acquires the AIS data. The target information display device according to claim 1 .

3. the selection order determination unit determines the selection order of the targets based on the distance from the own ship in the bow direction of the own ship; The target information display device according to claim 2 .

4. the selection order determination unit assigns a higher selection order to the target that is closer to the own ship in the bow direction of the own ship, The target information display device according to claim 3.

5. the selection order determination unit organizes the targets into a plurality of groups, determines a selection order for the groups, and determines a selection order for the targets for each group based on the distances from the ship to the plurality of targets in the bow direction of the ship; 5. A target information display device according to claim 2.

6. the selection order determination unit organizes the targets into a forward group located forward of the ship and a rearward group located rearward of the ship, The selection order of the front group is set higher than the selection order of the rear group. The target information display device according to claim 5 .

7. The AIS data includes information on the bow direction of the target, the selection order determination unit organizes the targets into a same direction traveling group traveling in the same direction as the own ship and an opposite direction traveling group traveling in an opposite direction to the own ship; setting the selection order of the opposite direction proceeding group higher than the selection order of the same direction proceeding group; 7. The target information display device according to claim 5 or 6.

8. The AIS data includes information on the bow direction of the target, the selection order determination unit organizes the targets into a group approaching the ship and a group moving away from the ship; The selection order of a group approaching the ship is set higher than the selection order of a group moving away from the ship.

8. A target information display device according to claim 2.

9. the selection order determination unit organizes the targets into a group of targets whose lateral distance to the ship is within a predetermined range and a group of targets whose lateral distance to the ship is equal to or greater than a predetermined range, The selection order of a group whose lateral distance from the ship is equal to or greater than a predetermined value is lower than the selection order of a group whose lateral distance from the ship is within the predetermined value, or the group is excluded.

9. A target information display device according to claim 1.

10. The AIS data includes information on the speed of the target, the selection order determination unit organizes the targets into a group whose speed is less than a predetermined value and a group whose speed is equal to or greater than a predetermined value, The selection order of a group whose speed is less than a predetermined value is lower than the selection order of a group whose speed is equal to or greater than the predetermined value, or the group is excluded.

9. A target information display device according to claim 2.

11. the selection order determination unit is configured by a user to set the selection order of the groups; 11. A target information display device according to claim 5.

12. the selection control unit switches the selection state to ascending order of the selection order when a first operation direction is detected, and switches the selection state to descending order of the selection order when a second operation direction is detected; 12. A target information display device according to claim 1.

13. The operator is a rotary operator.

13. A target information display device according to any one of claims 1 to 12.

14. A radar antenna, a signal processing unit that processes echo signals received by the radar antenna; Further provided with 14. A target information display device according to any one of claims 1 to 13.

15. the display unit has a vertically long screen and displays the display image with the bow of the ship facing upward.

15. A target information display device according to any one of claims 1 to 14.

16. Generate target data representing the positions of multiple targets present around the ship; outputting a display image to a display unit in which a plurality of symbols representing the plurality of targets are plotted in correspondence with positions of the plurality of targets based on the target data; determining a selection order of the targets based on the distances from the position of the ship to the positions of the plurality of targets at the same time in the bow direction of the ship; switching a selected symbol among the plurality of symbols in accordance with the selection order in response to two operation directions detected by an operation unit capable of detecting the operation directions of an operator; Target information display method.

17. Acquiring target data representing the positions of multiple targets present around the ship; generating a display image in which a plurality of symbols representing the plurality of targets are plotted in correspondence with the positions of the plurality of targets based on the target data; determining a selection order of the targets based on the distances from the position of the ship to the positions of the multiple targets at the same time in the bow direction of the ship; and switching a selected symbol among the plurality of symbols in accordance with the selection order in response to two operation directions detected by an operation unit capable of detecting the operation directions of an operator; A program that causes a computer to execute the following.

Images