Display control device, radar device, display control method, and program

Abstract

To provide a display control device that enables a user to grasp the fact that the target detected by a secondary radar is different from the target detected by a primary radar.SOLUTION: Provided is a display control device for causing a display device to display results of detection by primary and secondary radars. The display control device comprises: a data processing unit for determining whether or not a second target detected by the secondary radar is identical to a first target detected by the primary radar, and acquiring first movement information indicating at least a movement direction of the first target and based on the result of detection by the primary radar, and second movement information indicating at least a movement direction of the second target and based on the result of detection by the secondary radar; and a display control unit for causing the display device to display the movement direction indicated by the first movement information and the movement direction indicated by the second movement information when it is determined by the data processing unit that the second target is identical to the first target.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a display control device, a radar device, a display control method, and a program.

Background Art

[0002] A radar is known as a device for detecting the position of a target such as an aircraft or a ship. The radar includes a primary radar that irradiates most of the space with electromagnetic waves and receives reflected waves from targets in that space, and a secondary radar that receives a signal in which a transponder mounted on the target responds to an interrogation signal from the radar to obtain necessary information. An airport surveillance radar targeting an aircraft combines a primary radar and a secondary radar, and displays the identification of the aircraft detected by the secondary radar in association with the position of the aircraft detected by the primary radar.

[0003] Further, Patent Document 1 discloses a track tracking device that obtains an approximate curve of the displacement of the coordinates of a target using n radar data obtained between time k and time k - n + 1, and estimates the position and velocity of the target using the approximate curve.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in a conventional airport surveillance radar, there is a problem that an aircraft detected by a secondary radar, which is displayed in association with the position of the aircraft detected by a primary radar, may be different from the aircraft detected by the primary radar.

[0006] The present invention has been made in view of such circumstances, and provides a display control device, a radar device, a display control method, and a program that enable a user to recognize that a target detected by a secondary radar is different from a target detected by a primary radar.

Means for Solving the Problems

[0007] This invention has been made to solve the above-described problems. One aspect of the present invention is a display control device that causes a display device to display detection results by a primary radar and a secondary radar, the display control device determining whether a second target detected by the secondary radar is the same as a first target detected by the primary radar, and obtaining first movement information indicating at least a movement direction of the first target, the first movement information being based on a detection result by the primary radar, and second movement information indicating at least a movement direction of the second target, the second movement information being based on a detection result by the secondary radar, and a display control unit that causes the display device to display a movement direction indicated by the first movement information and a movement direction indicated by the second movement information when the data processing unit determines that the second target is the same as the first target.

[0008] Another aspect of the present invention is the above-described display control device, wherein when the data processing unit determines that the second target is the same as the first target, the display control unit causes the display device to display a first symbol indicating the first target, a second symbol indicating a movement direction indicated by the first movement information, a third symbol indicating the second target, and a fourth symbol indicating a movement direction indicated by the second movement information.

[0009] Another aspect of the present invention is the display control device described above, wherein the first movement information further indicates the speed of the first target, the second symbol further indicates the speed of the first target, the second movement information further indicates the speed of the second target, and the fourth symbol further indicates the speed of the second target.

[0010] Another aspect of the present invention is the display control device described above, wherein the display control unit moves the display positions of the third symbol and the fourth symbol to positions moved according to a predetermined rule from the display position of the first symbol, thereby displaying the third symbol and the fourth symbol in association with the first symbol and the second symbol.

[0011] Another aspect of the present invention is a display control device that causes a display device to display detection results by a primary radar, a secondary radar, the display control device, and the display device. The display control device determines whether a second target detected by the secondary radar is the same as a first target detected by the primary radar, and includes a data processing unit that acquires first movement information indicating at least the movement direction of the first target and based on the detection result by the primary radar, and second movement information indicating at least the movement direction of the second target and based on the detection result by the secondary radar, and a display control unit that causes the display device to display the movement direction indicated by the first movement information and the movement direction indicated by the second movement information when it is determined by the data processing unit that the second target is the same as the first target.

[0012] Another aspect of the present invention is a display control method for causing a display device to display detection results by a primary radar and a secondary radar, the method including: a first step of determining whether a second target detected by the secondary radar is the same as a first target detected by the primary radar; a second step of obtaining first movement information indicating at least a moving direction of the first target, the first movement information being based on a detection result by the primary radar; a third step of obtaining second movement information indicating at least a moving direction of the second target, the second movement information being based on a detection result by the secondary radar; and a fourth step of causing the display device to display the moving direction indicated by the first movement information and the moving direction indicated by the second movement information when it is determined in the first step that the second target is the same as the first target.

[0013] Another aspect of the present invention is a program for causing a computer to function as a display control device that causes a display device to display detection results by a primary radar and a secondary radar. The display control device includes: a determination unit that determines whether a second target detected by the secondary radar is the same as a first target detected by the primary radar; a data processing unit that obtains first movement information indicating at least a moving direction of the first target, the first movement information being based on a detection result by the primary radar, and second movement information indicating at least a moving direction of the second target, the second movement information being based on a detection result by the secondary radar; and a display control unit that causes the display device to display the moving direction indicated by the first movement information and the moving direction indicated by the second movement information when it is determined by the data processing unit that the second target is the same as the first target.

Advantages of the Invention

[0014] According to this invention, a user can recognize that a target detected by the secondary radar is different from a target detected by the primary radar.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram showing the configuration of a radar system 100 (radar device) according to an embodiment of the present invention. The radar system 100 is a device that detects and displays at least the position and moving direction of a target such as an aircraft or a ship. The radar system 100 includes a primary radar device 10, a secondary radar device 20, a display control device 30, and a display device 40.

[0017] The primary radar device 10 (primary radar) detects the position of a target from the time from when it irradiates electromagnetic waves until it receives the reflected wave from the target and the irradiation direction of the electromagnetic waves. The secondary radar device 20 (secondary radar) receives a signal in response to an interrogation signal irradiated by the secondary radar device 20 from a transponder mounted on the target, and detects information indicated by the received signal. The information includes at least the position of the target and second movement information. The information may further include the identification of the target (for example, position, altitude, or aircraft number, etc.). Note that the second movement information includes at least the moving direction of the target. The second movement information may further include the speed of the target.

[0018] The display control device 30 causes the display device 40 to display at least the position and movement direction of the target based on the detection results of the primary radar device 10 and the secondary radar device 20. The display control device 30 may further cause the display device 40 to display at least part of the identification and speed of the target. The display control device 30 may be realized by one or more computers reading and executing a program. The display control device 30 includes a track tracking unit 31, a data processing unit 32, and a display control unit 33. The track tracking unit 31 performs a track tracking process for estimating the position of the target (first target) detected by the primary radar device 10 and the first movement information at a specific time based on the position of the target. The specific time is, for example, the time corresponding to the position of the target (second target) detected by the secondary radar device 20 and the second movement information. The first movement information includes at least the movement direction of the target. The first movement information may further include the speed of the target. Note that the method by which the track tracking unit 31 estimates the position of the target and the first movement information at a specific time may be any method, and may be a known method such as the method described in Patent Document 1.

[0019] The data processing unit 32 acquires first movement information indicating at least the movement direction of the first target, which is based on the detection result by the primary radar device 10, and second movement information indicating at least the movement direction of the second target, which is based on the detection result by the secondary radar device 20. The data processing unit 32 determines whether the second target detected by the secondary radar device 20 is the same target as the first target detected by the primary radar device 10. For example, the data processing unit 32 may determine that they are the same target when the position of the second target detected by the secondary radar device 20 is within a predetermined distance from the position of the first target estimated by the track tracking unit 31, and determine that they are not the same target when it is not within the predetermined distance. Also, the data processing unit 32 may use not only the position but also the first movement information and the second movement information for the determination of whether they are the same target. Note that the second movement information may be calculated by the secondary radar device 20 or the data processing unit 32 based on the position of the target indicated by the information detected by the secondary radar device 20.

[0020] When the data processing unit 32 determines that the second target is the same as the first target, the display control unit 33 causes at least the movement direction indicated by the first movement information and the movement direction indicated by the second movement information to be displayed on the display device 40. The display control unit 33 may further cause at least a part of the position of the first target detected by the primary radar device 10 or estimated by the track tracking unit 31, the identification and position of the second target indicated by the information detected by the secondary radar device 20, the speed indicated by the first movement information, and the speed indicated by the second movement information to be displayed on the display device 40. The display device 40 includes display means such as a liquid crystal display and an organic EL (Electro Luminescence) display, and displays text and images according to a signal from the display control device 30.

[0021] FIG. 2 is a flowchart for explaining the operation of the display control device 30 in the present embodiment. First, the track tracking unit 31 acquires the detection result of the primary radar device 10 from the primary radar device 10 (step Sa1). This detection result includes the position of the first target detected by the primary radar device 10. Next, the track tracking unit 31 performs track tracking processing on the first target using the detection result of the primary radar device 10 (step Sa2). By this track tracking processing, the position of the first target and the first movement information at the time corresponding to the detection result of the secondary radar device 20 are estimated.

[0022] Next, the data processing unit 32 acquires the detection result of the secondary radar device 20 from the secondary radar device 20 (step Sa3). This detection result includes the position of the second target detected by the secondary radar device 20 and the second movement information. Next, the data processing unit 32 determines whether the second target in step Sa3 is the same target as the first target in step Sa1 (step Sa4). For example, the data processing unit 32 determines that they are the same target when the position of the second target acquired in step Sa3 is within a predetermined distance from the position of the first target estimated in step Sa2. The predetermined distance may be a value determined in advance or a value determined by the speed of the first target or the second target.

[0023] In step Sa4, when it is determined that they are the same target (step Sa4 - Yes), the display control unit 33 causes the display device 40 to display a first symbol indicating the first target detected by the primary radar device 10, a second symbol indicating the moving direction indicated by the first movement information, a third symbol indicating the second target detected by the secondary radar device 20, and a fourth symbol indicating the moving direction indicated by the second movement information (step Sa5). Each of the first to fourth symbols may be a predetermined mark. The third symbol may include a character string indicating the identification of the second target. The first and second symbols may be displayed at positions corresponding to the position of the first target in the display area of the display device 40. The display control unit 33 may associate and display the third symbol and the fourth symbol with the first symbol and the second symbol by setting the display positions of the third symbol and the fourth symbol to positions moved from the display position of the first symbol according to a predetermined rule. The predetermined rule may be to move a predetermined distance in the direction opposite to the position corresponding to the radar system 100 along a straight line passing through the position corresponding to the radar system 100 and the display position of the first symbol from the display position of the first symbol, or to move a predetermined distance in a predetermined direction from the display position of the first symbol, or to move a predetermined distance in a direction corresponding to the first movement information or the second movement information from the display position of the first symbol. The direction corresponding to the first movement information or the second movement information may be the opposite direction to the first movement information or the second movement information.

[0024] In step Sa4, when it is determined that they are not the same target (step Sa4 - No), the display control unit 33 causes the display device 40 to display a first symbol indicating the first target detected by the primary radar device 10 and a second symbol indicating the moving direction indicated by the first movement information (step Sa6). In addition, when a plurality of first targets or a plurality of second targets are detected, the data processing unit 32 determines in step Sa4 for all combinations of the first targets and the second targets, and the display control unit 33 performs the process of step Sa5 for the combination of the first target and the second target determined to be the same target, and may perform the process of step Sa6 for the first target for which there is no second target determined to be the same target.

[0025] FIG. 3 is a schematic diagram showing an example of a display screen of the display device 40 in the present embodiment. The display area D1 is a circular display area whose center C1 corresponds to the position of the radar system 100. The symbol S1 is a first symbol (ellipse) indicating a first target, and its display position corresponds to the position of the first target. The symbol S2 is a second symbol indicating first movement information, and its display position corresponds to the position of the first target. The double circle constituting the symbol S2 corresponds to the position of the first target, and the straight line extending from the inner circle of the double circle indicates the moving direction of the first target in the extending direction. Further, the length of the straight line may indicate the speed of the first target. The symbol S3 is a third symbol indicating a second target, and indicates that there is a second target determined to be the same as the first target indicated by the symbol S1. Its display position is a position moved by a predetermined distance from the display position of the first symbol to the side opposite to the center C1. The symbol S3 may include a character string indicating the identification of the second target. The symbol S4 is a fourth symbol indicating second movement information, and its display position corresponds to the display position of the third symbol, and its direction indicates the moving direction of the second target. Further, the speed indicated by the second movement information is displayed together with the symbol S4 as the character string "Speed 90kts". Thus, in the display area D1, the symbol S2 (the moving direction indicated by the first movement information) and the symbol S4 (the moving direction indicated by the second movement information) are displayed. Thereby, even when the display control device 30 determines that the first target and the second target are the same although they are different targets, if the moving direction of the first target and the moving direction of the second target are different, the moving direction indicated by the symbol S2 and the moving direction indicated by the symbol S4 are different. Therefore, the user of the radar system 100 can recognize that the second target detected by the secondary radar is different from the first target detected by the primary radar.

[0026] Further, the present invention may also be the following embodiments. (1) One embodiment is a display control device that causes a display device to display detection results by a primary radar and a secondary radar. The display control device determines whether a second target detected by the secondary radar is the same as a first target detected by the primary radar, and obtains first movement information indicating at least the movement direction of the first target, which is based on the detection result by the primary radar, and second movement information indicating at least the movement direction of the second target, which is based on the detection result by the secondary radar. When the data processing unit determines that the second target is the same as the first target, the display control device includes a display control unit that causes the display device to display the movement direction indicated by the first movement information and the movement direction indicated by the second movement information.

[0027] Thereby, the user can grasp that the target detected by the secondary radar is different from the target detected by the primary radar by referring to the movement direction indicated by the first movement information and the movement direction indicated by the second movement information.

[0028] (2) Further, another embodiment is the display control device according to (1), wherein when the data processing unit determines that the second target is the same as the first target, the display control unit causes the display device to display a first symbol indicating the first target, a second symbol indicating the movement direction indicated by the first movement information, a third symbol indicating the second target, and a fourth symbol indicating the movement direction indicated by the second movement information.

[0029] Thereby, the user can grasp that the target detected by the secondary radar is different from the target detected by the primary radar by referring to the first to fourth symbols.

[0030] (3) Further, another embodiment is the display control device described in (2), wherein the first movement information further indicates the speed of the first target, the second symbol further indicates the speed of the first target, the second movement information further indicates the speed of the second target, and the fourth symbol further indicates the speed of the second target.

[0031] Thereby, the user can grasp that the target detected by the secondary radar is different from the target detected by the primary radar by referring to the speeds of the first target and the second target.

[0032] (4) Further, another embodiment is the display control device described in (2) or (3), wherein the display control unit makes the display positions of the third symbol and the fourth symbol be positions moved according to a predetermined rule from the display position of the first symbol, so as to display the third symbol and the fourth symbol in association with the first symbol and the second symbol.

[0033] Thereby, the user can easily grasp the combination of the first to fourth symbols to be referred to.

[0034] (5) Further, another embodiment is a display control device that causes a display device to display detection results by a primary radar, a secondary radar, and the display control device. The display control device determines whether a second target detected by the secondary radar is the same as a first target detected by the primary radar, and includes first movement information indicating at least a movement direction of the first target, which is based on a detection result by the primary radar, and second movement information indicating at least a movement direction of the second target, which is based on a detection result by the secondary radar. The display control device further includes a data processing unit that acquires the first movement information and the second movement information, and a display control unit that causes the display device to display the movement direction indicated by the first movement information and the movement direction indicated by the second movement information when the data processing unit determines that the second target is the same as the first target.

[0035] (6) Further, another embodiment is a display control method that causes a display device to display detection results by a primary radar and a secondary radar. The display control method includes: a first step of determining whether a second target detected by the secondary radar is the same as a first target detected by the primary radar; a second step of acquiring first movement information indicating at least a movement direction of the first target, which is based on a detection result by the primary radar; a third step of acquiring second movement information indicating at least a movement direction of the second target, which is based on a detection result by the secondary radar; and a fourth step of causing the display device to display the movement direction indicated by the first movement information and the movement direction indicated by the second movement information when it is determined in the first step that the second target is the same as the first target.

[0036] (7) Further, another embodiment is a program for causing a computer to function as a display control device that displays detection results by a primary radar and a secondary radar on a display device. The display control device determines whether a second target detected by the secondary radar is the same as a first target detected by the primary radar, and is first movement information indicating at least a movement direction of the first target, the first movement information based on a detection result by the primary radar, and second movement information indicating at least a movement direction of the second target, the second movement information based on a detection result by the secondary radar. A data processing unit that acquires the second movement information, and when the data processing unit determines that the second target is the same as the first target, the movement direction indicated by the first movement information and the movement direction indicated by the second movement information are displayed on the display device. A display control unit for causing the display device to display the movement direction.

[0037] Further, a program for realizing the functions of the display control device 30 in FIG. 1 may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize the display control device 30. Here, the “computer system” is assumed to include hardware such as an OS and peripheral devices.

[0038] In addition, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, etc., and a storage device such as a hard disk incorporated in a computer system. Further, the "computer-readable recording medium" also includes those that dynamically hold a program for a short period of time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and those that hold a program for a certain period of time, like the volatile memory inside a computer system serving as a server or a client in that case. Also, the above program may be for realizing a part of the functions described above, or may be capable of realizing the above functions in combination with a program already recorded in the computer system.

[0039] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present invention are also included.

Explanation of Reference Numerals

[0040] 10 Primary radar device 20 Secondary radar device 30 Display control device 31 Track tracking section 32 Data processing section 33 Display control section 40 Display device

Claims

1. A display control device that causes a display device to display detection results by a primary radar and a secondary radar, determines whether a second target detected by the secondary radar is the same as a first target detected by the primary radar, and is first movement information indicating at least the movement direction of the first target, the first movement information based on the detection result by the primary radar, and second movement information indicating at least the movement direction of the second target, the second movement information based on the detection result by the secondary radar, and a data processing unit that acquires the second movement information; a display control unit that causes the display device to display the movement direction indicated by the first movement information and the movement direction indicated by the second movement information when the data processing unit determines that the second target is the same as the first target; A display control device comprising:

2. When the data processing unit determines that the second target is the same as the first target, the display control unit causes the display device to display a first symbol indicating the first target, a second symbol indicating the movement direction indicated by the first movement information, a third symbol indicating the second target, and a fourth symbol indicating the movement direction indicated by the second movement information. The display control device according to claim 1.

3. The first movement information further indicates the speed of the first target, The second symbol further indicates the speed of the first target, The second movement information further indicates the speed of the second target, The fourth symbol further indicates the speed of the second target. The display control device according to claim 2.

4. The display control unit causes the third symbol and the fourth symbol to be displayed in association with the first symbol and the second symbol by setting the display positions of the third symbol and the fourth symbol to positions moved according to a predetermined rule from the display position of the first symbol. The display control device according to claim 2 or claim 3.

5. A display control device that causes a display device to display detection results by a primary radar, a secondary radar, a display control device, and a display device, Determine whether the second target detected by the secondary radar is the same as the first target detected by the primary radar, and obtain first movement information indicating at least the movement direction of the first target, which is first movement information based on the detection result by the primary radar, and second movement information indicating at least the movement direction of the second target, which is second movement information based on the detection result by the secondary radar, a data processing unit; When it is determined by the data processing unit that the second target is the same as the first target, a display control unit that causes the display device to display the movement direction indicated by the first movement information and the movement direction indicated by the second movement information; A radar device comprising: **Claim 6** A display control method for causing a display device to display detection results by a primary radar and a secondary radar, comprising: A first step of determining whether a second target detected by the secondary radar is the same as a first target detected by the primary radar; A second step of obtaining first movement information indicating at least the movement direction of the first target, which is first movement information based on the detection result by the primary radar; A third step of obtaining second movement information indicating at least the movement direction of the second target, which is second movement information based on the detection result by the secondary radar; A fourth step of causing the display device to display the movement direction indicated by the first movement information and the movement direction indicated by the second movement information when it is determined in the first step that the second target is the same as the first target; A display control method having: **Claim 7** A program for causing a computer to function as a display control device for causing a display device to display detection results by a primary radar and a secondary radar, wherein the display control device determines whether a second target detected by the secondary radar is the same as a first target detected by the primary radar, and obtains first movement information indicating at least the movement direction of the first target, which is first movement information based on the detection result by the primary radar, and second movement information indicating at least the movement direction of the second target, which is second movement information based on the detection result by the secondary radar, a data processing unit; ​ When the data processing unit determines that the second target is the same as the first target, a display control unit that causes the display device to display the moving direction indicated by the first movement information and the moving direction indicated by the second movement information A program comprising.

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