JP2005189081A - Target detection device and air traffic control system using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a moving target with high accuracy, and to accurately and efficiently track the moving target, even in a state of clutters or multipath echoes are frequently generated. <P>SOLUTION: This device is equipped with a region determination means for detecting the target position from a received signal by a radar device, and determining whether the target is in a state determination region provided beforehand; a state determination means for determining that the target is the moving target, when the moving distance or the tracking reliability of the target determined to be in the state determination region by the region determination means satisfies a prescribed condition, and determining that the target is a false target, when the moving distance or the tracking reliability does not satisfy the prescribed condition, even after elapse of a fixed time; a tracking means for performing tracking processing of the target determined to be in the state determining region, according to the determination result by the state determination means; and a display device for displaying the processing result by the tracking means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention detects a moving target such as a vehicle or an aircraft using a radar device or the like, and displays a position information, a tracking result, etc. of the moving target on a display device, and an air traffic control system using the target detecting device About.

  Conventionally, in tracking processing performed on a moving target such as a vehicle, when target detection information (hereinafter referred to as plot information) is first detected via a radar device or the like, the plot information is displayed as “ Initial registration is made to “quasi-temporary track”, and thereafter, tracking processing for the moving target is continued as “temporary track” using time-series plot information correlated with the registered plot information. Such processing is repeatedly performed at a specific cycle, and when the “temporary track” tracking process exceeds the predetermined number of times, the “temporary track” is promoted to “main track” and the target symbol is displayed from the time of registration to the main track. Start displaying. For example, when plot information for a plurality of different moving targets is detected and registered as main wakes, the plurality of target symbols and their tracking results are respectively displayed on a display device such as a display monitor.

  However, the received signal within the observation range obtained by the radar device may contain noise signals called so-called clutter and multipath echo. In spite of the absence of the target, problems such as displaying the target symbol and degrading the accuracy of the tracking process occur.

  For example, in an airport surface detection system that detects an aircraft on the airport surface, as a technique for preventing the influence of such a noise signal, a region in which clutter, multipath echo, etc. frequently occur is prohibited in advance (Non Automatic Initiation). ) Region (hereinafter referred to as the NAI region), and when it is determined that the generation position of the first detection target signal is within the NAI region, the target signal is assumed to be a false target signal. It has been proposed to prevent the display of false symbols by prohibiting the initial detection of signals.

JP-A-64-3580 (page 1, right column-page 2, left column, Fig. 1)

  However, since the conventional target detection apparatus is configured as described above, it is possible to display the target symbol more accurately by preventing the influence of clutter, multipath echo, etc. occurring in the NAI region. When a moving target enters such an NAI area, it is assumed that it is a false target signal regardless of whether it is a target signal, so the tracking process is carried out before entering the NAI area. There has been a problem in that the target detection rate is lowered because symbol detection of the target signal cannot be performed until the target has left the NAI area due to a missed search for the moving target.

  On the other hand, in a region where clutter, multipath echo, etc. occur frequently such as the NAI region, it is difficult to distinguish between the target signal and the noise signal as described above, and normal tracking processing is executed in such a region. However, there is a problem that tracking of the target signal becomes unstable and tracking accuracy deteriorates.

  For example, when the target signal moves and approaches a noise signal, the noise signal is recognized as the target signal, and the tracking process is performed on the noise signal and the past target signal, so-called tracking. There has been a problem that a phenomenon such as dislocation occurs and a tracking result different from the actual moving state of the moving target is displayed on the display device.

  In recent years, in the air traffic control business, etc., the number of flights has been increasing with the expansion of aircraft use, and it is important to ensure the safety of air traffic control to accurately grasp the positional relationship between each aircraft. Therefore, there is a demand for more accurate target detection processing.

  The present invention has been made to solve the above problems, and it is difficult for a moving target to enter a region where clutter, multipath echo, etc. frequently occur, and to distinguish the moving target from multipath echo, etc. Even in such a case, it is possible to accurately identify a moving target and a multipath echo, etc., while preventing a decrease in target detection rate due to a missing target signal, etc., and more accurate tracking results It is an object of the present invention to provide a novel target detection apparatus capable of displaying the above.

  In addition, while it is possible to prevent such a decrease in the target detection rate, it is possible to perform tracking processing of a moving target more quickly and accurately, and the results of such tracking processing are displayed on a display device such as a monitor. It is an object of the present invention to provide a novel target detection device capable of displaying and an air traffic control system using the same.

  The target detection device according to the present invention detects a position of a target from a received signal of a radar device, and determines whether or not the target is in a state determination region provided in advance. When the movement distance or tracking reliability of the target determined to be in the state determination region satisfies a predetermined condition, it is determined as a moving target, and the predetermined condition is satisfied even if the movement distance or tracking reliability passes a certain time. State determination means for determining a false target when not satisfying, tracking means for performing tracking processing of the target determined to be in the state determination area according to the determination result of the state determination means, and the tracking means And a display device for displaying the result of the processing.

  An air traffic control system according to the present invention detects a position of a target from a radar device that transmits and receives radio waves to and from an airport surface, and a received signal obtained from the radar device, and the target is in a state determination region provided in advance. An area determination means for determining whether or not the movement target or the tracking reliability of the target determined to be in the state determination area by the area determination means satisfies a predetermined condition, and determines the movement target If the predetermined condition is not satisfied even if the distance or tracking reliability elapses for a certain period of time, the state determination unit determines that the object is a fake target, and the state determination region is determined according to the determination result of the state determination unit. Tracking means for performing tracking processing of the target, and processing results of the target determined as the moving target by the state determination means among the processing results of the tracking means are displayed, and processing results of the false target are not displayed When It is obtained by a that display device.

  According to the present invention, there is a region where clutter, multipath echo, etc. frequently occur within the observation range of the radar device, etc., and the moving target intrudes into a region where such clutter, multipath echo, etc. occurs frequently and moves. Even when it is difficult to distinguish between a target and a multipath echo, it is possible to accurately identify a moving target and a multipath echo. Tracking processing can be performed, and the result of such efficient and highly accurate tracking processing can be displayed on the display device.

  In addition, according to another invention, it is possible to accurately identify the target signal and the false target signal caused by clutter, multipath echo, etc., so that more stable tracking processing can be realized, and air traffic control Safety can be improved.

  The target detection apparatus according to the present invention determines a moving target when the moving distance or tracking reliability of the target satisfies a predetermined condition, and satisfies the predetermined condition even if the moving distance or tracking reliability elapses a predetermined time. A state determination unit that determines that the object is a fake target when the condition is not satisfied, and a tracking unit that performs a tracking process of the target determined to be in the state determination region according to a determination result of the state determination unit. The processing result of the means is displayed on the display device.

  A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a target detection apparatus according to an embodiment of the present invention, and FIG. 2 is a partial block diagram showing a specific configuration of the target detection processing apparatus 7 shown in FIG. In this embodiment, the case of air traffic control will be described as an example. However, the present invention is not limited to this and can be applied to various systems.

  In FIG. 1, reference numeral 1 denotes a radar device composed of an antenna unit 1 a and a transceiver 1 b, and 2 denotes a signal processing means for detecting a reception signal of a predetermined level or higher among reception signals received by the radar device 1, 3 identifies whether each received signal detected by the signal processing means 2 is an existing signal or a newly detected signal, and is a newly detected signal (hereinafter referred to as a new target). Is initially registered, and when it is already registered (hereinafter referred to as an existing target), the tracking means for performing tracking processing based on the processing of the target determination means 4 described later, 4 is the existing target in the tracking means 3 The received signal is identified as being a region, and the state is further determined. The existing target is a moving target such as an aircraft or a vehicle, or a false target such as clutter or multi-echo. A target determination means for determining.

  Reference numeral 5 denotes a display processing means for inputting the processing result of the tracking means 3 and the processing result of the target determination means 4 and converts them into display signals corresponding to the display method of the display device 6. This is a display device that displays a symbol signal (target symbol) of an aircraft, a vehicle, etc., a tracking result of the tracking means 3 and the like according to an output display signal.

  In the target detection apparatus according to the first embodiment, a radar apparatus is used as the target detection means. However, any means may be used as long as it can detect the target, such as a lidar apparatus. The target detection processing device 7 is configured to identify whether the tracking unit 3 is a new target or an existing target, but the target determination unit 4 may be provided with such an identification function. The processing device 7 may be any device that realizes each processing as shown in FIG.

  In FIG. 2, reference numeral 8 performs correlation processing between the received signal detected by the signal processing means 2 and the received signal detected in the past, and identifies whether the received signal is an existing target or a new target. The correlation processing unit 9 performs tracking processing on the existing target for which the target determination processing unit 4 determines whether the target is a moving target or a fake target, and 10 identifies the existing target by the correlation processing unit 8. It is determined from the position information of the received signal that the existing target is detected in which area within the observation range, and the moving target, the fake target or either cannot be determined according to the determined area An area determination processing unit 11 that determines that it is not determined as an object, 11 monitors a moving distance or the like of an existing target that is determined to be undetermined by the area determination unit 10, and moves an existing target that satisfies a predetermined condition A determining condition determination processing unit as a standard product. In addition, if the undecided state continues for a long time, the subsequent tracking process will be delayed, etc., so that the state determination processing unit 11 does not satisfy the predetermined condition even if a predetermined time elapses. It is determined that

  Next, the operation will be described. First, operations of the radar apparatus 1 and the signal processing means 2 will be briefly described. The radar device 1 transmits radar radio waves from the antenna unit 1a and receives reflected radio waves from a target or the like. In the case of an air traffic control system, radar radio waves are transmitted to and received from the airport surface. The reflected radio wave received by the antenna unit 1 a is subjected to reception processing by the transceiver 1 b and output to the signal processing means 2. The signal processing means 2 is previously provided with a threshold value for detecting a received signal at a predetermined level or higher, and a received signal at a predetermined level or higher is detected from the received signals output from the radar apparatus 1 and output to the tracking means 3. To do. In addition, since the radar apparatus 1 changes the transmission / reception direction of the radar radio wave and observes the entire observation range, it may receive reflected radio waves or clutter from a plurality of moving targets in one observation cycle. In this case, a plurality of received signals are detected from the signal processing means 2 and output to the tracking means 3.

  It is possible to detect a received signal at each observation period by repeating such a radar radio wave transmission / reception operation a predetermined number of times. From these time-series received signals, the position, moving state, etc. of a moving target within the observation range can be determined. Can be detected. It is possible to improve the tracking accuracy and the like in the tracking means 3 by increasing the number of times of transmission and reception of radar radio waves. However, the observation period of the radar apparatus 1 must be set longer, and the tracking means 3 etc. It is necessary to speed up the processing capacity of the radar device 1 and the extent to which one observation period (observation time) of the radar device 1 is set depends on the observation range, operating conditions, etc. of the system to which this device is applied. Set as appropriate.

  Next, the operations of the tracking unit 3 and the target determination unit 4 will be described in detail with reference to FIGS. FIG. 3 is a flowchart showing the processing contents of the target detection apparatus shown in FIG. 1, and is a flowchart showing a series of processing contents from the tracking means 3 to the display device 6. The new received signal output from the signal processing means 2 is first processed by the correlation processing unit 8. The correlation processing unit 8 performs a correlation process between the newly input received signal and the initially registered existing target, and determines that there is a correlation when there is a correlation with any of the existing targets. If there is no correlation, it is determined that there is no correlation (S01). The received signal determined to have a correlation is an existing target that has already been initially registered, and is output to the region determination processing unit 10 of the target determination unit 4. The received signal determined to have no correlation is a newly detected new target, and is initially registered in a storage unit (not shown) provided in the tracking means 3 or the like (S02). In this way, correlation processing is performed on all received signals detected by the signal processing means 2.

  The region determination processing unit 10 determines in which region in the observation range the existing target processed by the correlation processing unit 8 is based on the position information of the received signal detected by the signal processing means 2. Specifically, the observation range of this target detection apparatus is an area where clutter and multipath echo frequently occur (hereinafter referred to as multipath area), and an area where clutter and multipath echo frequently occur, but includes moving targets. It is an area that is predicted to be highly likely, and is an area (hereinafter referred to as an echo area) in which processing of the state determination processing unit 11 described later is performed and an area other than that (hereinafter referred to as a target area). It is discriminated in advance, and it is determined whether the existing target is located in the multipath area, the echo area, or the target area from the position information of the received signal identified as the existing target (S03).

  Here, taking the case of air traffic control as an example, the multipath area, the echo area, and the target area will be described. FIG. 4 is an explanatory diagram for explaining examples of these regions, and is a region explanatory diagram schematically showing the state of the airport surface. In FIG. 4, 12 is a runway, 13 is an airport terminal, 14 is a part called an apron between the runway 12 and the airport terminal 13, 15 is a taxiway between the runway 12 and the apron 14, and 16 is an aircraft. It is. Reference numeral 17 denotes a multipath area (corresponding to a conventional NAI area) provided to include the apron 14 and the taxiway 15 between the runway 12 and the airport terminal 13, and 18 denotes the multipath area 17. This is an echo area provided in the apron 14 of the above. On the airport side, clutter and multipath echo are likely to occur frequently near the apron 14 and so on, and such a part is set as a multipath area 17, and the apron 14 and the taxiway 15 and the like where the aircraft etc. move are echo areas. Set as. The other areas that are less affected by clutter and multipath echo are designated as target areas.

  When the area determination processing unit 10 determines that the existing target is in the target area, the area determination processing unit 10 instructs the tracking processing unit 9 to perform tracking processing based on a normal tracking condition. If it is determined that it is outside the echo area (hereinafter simply referred to as a multipath area), the tracking processing unit 9 is instructed to change the tracking condition (S04). When it is determined that the existing target is in the target area, the tracking processing unit 9 performs tracking processing according to the tracking condition for the moving target such as an aircraft or a vehicle, and when it is determined that the existing target is in the multipath area Changes to the tracking condition for multipath, and performs the tracking process of the existing target (S05).

  When the existing target is a clutter, multipath echo, etc., it does not move, and by adjusting the tracking target as a stationary target, it is possible to stably track false targets such as clutter, multipath echo, etc. . As described above, in the target detection apparatus according to the first embodiment, the received signal based on the reflected signal from the multipath area is not assumed to be a false target signal such as clutter or multipath, and tracking processing corresponding to each existing target is performed. As described later, even when the moving target moves and approaches the clutter as will be described later, it is possible to prevent the tracking target from moving away from the moving target.

  When it is determined that the existing target is in the echo area, it is not determined which reflected signal is the existing target, and the state determination processing unit 11 performs a determination process. In other words, the existing target determined to be in the echo area may be an existing target based on the reflected signal from the moving target even if it is a reflected signal from the multipath area. In order to more accurately determine whether or not the object is a moving target, a determination process by the state determination processing unit 11 is performed.

  Next, processing contents of the state determination processing unit 11 will be described. The state determination processing unit 11 determines the movement distance or the like of the existing target determined to be in the echo area by the area determination unit 10, and if the movement distance or the like satisfies a predetermined condition, the reflected signal from the moving target Is determined to be an existing target based on the above, and if the predetermined condition is not satisfied, the undetermined state is continued. The existing target for which it was not possible to identify the existing target based on which reflected signal by the determination processing of the state determination processing unit 11 is obtained in the next observation cycle without performing subsequent tracking processing or the like. This state is held until the received signal determination process. If the predetermined condition is not satisfied even after a predetermined time has elapsed, it is determined that the target is an existing target based on a reflected signal from clutter, multipath echo, or the like (S06).

Here, the branch condition (S06) of the state determination processing unit 11 shown in FIG. 3 will be described in detail. The state determination processing unit 11 performs, for example, the following parameter determination process for the existing target determined to be in the echo area.
Movement distance from first search for existing target ≧ constant distance (parameter 1)
Tracking reliability of existing target (Track Quality) ≧ constant value (parameter 2)
Elapsed time from first search for existing target ≧ fixed time (parameter 3)

  If both the movement distance (parameter 1) and tracking reliability (hereinafter referred to as TQ) (parameter 2) of the existing target exceed a certain value, it is determined that the predetermined condition is satisfied, and the existing The target is determined to be an existing target based on a reflection signal from the moving target. In addition, if one or both of the parameters is less than or equal to a certain value, the undetermined state is continued. If a certain period of time has passed in that state (parameter 3), it is determined that a timeout has occurred, and clutter or multi It is determined that the target is an existing target based on a reflected signal from a path echo or the like.

  This is because, for example, an existing target that moves at a stable speed is determined to be a moving target such as an aircraft when it has moved a certain distance, while an existing target that moves unstablely or does not move. Indicates that the target is determined to be a false target such as a multipath echo after a predetermined time has elapsed. In the first embodiment, the moving distance (parameter 1) and TQ (parameter 2) are used to improve target identification accuracy. ) Is set as the predetermined condition when it exceeds a certain value, but the case where either one is satisfied may be set as the predetermined condition.

  Note that the value of each parameter is appropriately set according to the scale of the multipath area, echo area, etc. of the system to which the present apparatus is applied, the moving speed of the moving target, etc., and is applied to, for example, an air traffic control system In this case, parameter 1 is 50 m, parameter 2 is TQ = 5, parameter 3 is 20 seconds, and so on.

  When it is determined that the target is an existing target based on a reflected signal from a clutter, a multipath echo, or the like, the tracking processing unit 9 is instructed to change the tracking condition for the existing target (S04), and the moving target When it is determined that the target is an existing target based on the reflected signal from the tracking target, the tracking processing unit 9 is instructed to perform tracking processing based on the tracking condition for the moving target. When it is determined that the existing target is a moving target, the tracking processing unit 9 performs tracking processing based on the tracking condition for the moving target, and it is determined that the existing target is a false target such as clutter or multipath echo. If so, the tracking condition is changed to the tracking condition for multipath, and the tracking process of the existing target is performed (S05).

  If the moving target such as an aircraft is still in the echo area 18 shown in FIG. 4 after a certain time has elapsed, it is determined by the state determination processing unit 11 to be a fake target by multipath echo. In this case, if the moving target starts to move, the tracking parameter that is adjusted to be regarded as a stationary target will cause tracking to be unable to follow the movement of the target, resulting in tracking error, and re-detection. As a result, the determination processing by the state determination processing unit 11 can be received again.

  The processing result of the tracking processing unit 9 is output to the display processing means 5. The display processing unit 5 receives not only the processing result of the tracking processing unit 9 but also the processing result of the target determination unit 4. The display processing unit 5 identifies whether the processing result is for the moving target or the false target (S07), and the tracking result for the moving target is converted into a display signal and displayed. Output to device 6. On the other hand, in the case of a processing result or the like for a false target such as clutter or multipath echo, a non-display process is performed (S08). The display device 6 displays the result of the tracking process on the moving target on a display unit (not shown) such as a monitor based on the display processing signal output from the display processing unit 5 (S09).

  FIG. 5 is a state transition diagram showing the state transition of the received signal accompanying the series of processing shown in FIG. 3, and the state transition of the received signal identified by the correlation processing unit 8 will be described using FIG. In FIG. 5, C1 is INIT (state C1) which is an initial state, C2 is ECHO (state C2) which is an undecided state whether it is a moving target such as an aircraft or a false target due to multipath echo, C3 is an aircraft or the like TARGET (state C3), which is a state determined as a moving target, and MULTIPATH (state C4), which is a state determined as a false target such as a multipath echo. Performed immediately after the tracking calculation at. As shown in FIG. 5, the state transition model according to the present invention is composed of four states, and all received signals start from the initial state INIT (state C1).

  INIT (state C1) ends once at the start of tracking, and after the first tracking calculation is identified as an existing target and transitions to any other state. For example, an existing target that is determined to be outside the NAI area, that is, the multipath area in the area determination processing unit 10 is determined to be a moving target such as an aircraft and transitions to TARGET (state C3). The existing target that is determined to be within the area and other than the echo area transitions to MULTIPATH (state C4). Then, the existing target determined to be within the echo area transitions to ECHO (state C2).

  ECHO (state C2) is a state in which it is not determined whether the existing target is a moving target such as an aircraft or a fake target by multipath echo. In the target detection device according to this embodiment, the region determination processing unit 10 A determination process by the state determination processing unit 11 is further performed on the existing target determined to be ECHO (state C2). And the existing target which satisfy | fills a predetermined condition by the determination process of this state determination process part 11 changes to TARGET (state C3), and a subsequent tracking process is implemented. For the existing target that does not satisfy the predetermined condition, ECHO (state C2) is continued, and if ECHO (state C2) continues even after a predetermined time has elapsed, the state transitions to MULTIPATH (state C4). Note that there is no transition from TARGET (state C3) and MULTIPATH (state C4) to another state, and it continues until tracking deletion is performed.

  Finally, a display screen displayed on the target detection apparatus shown in FIG. 1 will be briefly described with reference to FIGS. 6 and 7. 6 and 7, 19 is a radar echo, 20 is plot information, 21 is a display symbol, t 1 and t 2 are existing targets, and these 19 to 21 are obtained for each observation period of the radar apparatus 1. FIG. 6 is an explanatory diagram of a display screen showing an example of a display screen such as the tracking processing result displayed on the display device 6. When the existing target t1 moving at a substantially stable speed moves a certain distance or more, the aircraft or the like It is determined that the object is a moving target and is displayed as a symbol. That is, among the existing targets t1 and t2 initially registered in the tracking means 3 or the like, the existing target t1 is determined to satisfy the predetermined condition as described above as a result of the determination process by the state determination processing unit 11. Although the tracking result or the like is displayed as a symbol, the existing target t2 does not satisfy a predetermined condition even if a predetermined time elapses, and is determined to have timed out and is not displayed.

  FIG. 7 is an explanatory diagram of a display screen showing a display screen example such as the tracking processing result displayed on the display device 6, where the existing target t1 that is the moving target is close to the existing target t2 that is the false target. Even in a passing situation, the tracking of the existing target t1 does not transfer to the plot information of the existing target t2 such as multipath echo, and the tracking process is stably continued. As described above, the tracking processing unit 9 continues the tracking process for both the existing target based on the reflected signal from the moving target and the existing target based on the reflected signal from clutter, multipath echo, etc. The tracking of the existing target t1 is transferred to the plot information of the existing target t2, such as multipath echo, by performing the correlation processing by the correlation processing unit 8 in consideration of the result of the tracking processing of each existing signal. The tracking process can be continued stably.

  In this manner, the moving target tracking process is continued (symbols are displayed), while the fake target tracking process is also continued (symbols are not displayed), thereby moving the moving target such as an aircraft or a vehicle. Even when an object passes in the vicinity of multipath echo generation, correlation calculation is performed with each moving object and fake target taking into account each other's influence. Phenomenon such as tracking deviation that is transferred to the plot information of the false target by echo is reduced, and as a result, stable tracking processing can be performed.

  As described above, in the target detection apparatus according to the first embodiment, whether or not the target is a moving target such as an aircraft or a vehicle is considered in consideration of not only the position information of the existing target but also its operation state. Since it is configured, it is possible to more accurately identify whether a moving target such as an aircraft or a vehicle has entered a region where clutter or multipath echo frequently occurs and whether it is a moving target. It is possible to prevent the detection of the target detection rate by avoiding the occurrence of signal hunting, etc., and more accurate and efficient tracking of the moving target in such areas where clutter and multipath echo occur frequently. The result of such an accurate and efficient tracking process can be displayed on the display device 6.

  Hereinafter, an air traffic control system according to Embodiment 2 of the present invention will be described. The air traffic control system according to the present invention is, for example, a system to which a target detection device as shown in FIGS. 1 and 2 is applied, and detailed description thereof is omitted. In this case, the radar device 1 shown in FIG. 1 is installed so that the entire airport surface can be observed, and the display device 6 is installed in a control room or the like that performs control work. Then, target symbols such as airplanes and vehicles moving on the airport surface observed by the radar device 1, vehicles, and the like are displayed on the display device 6 installed in the control room or the like to support the control work by the controller.

  In the first embodiment, the case of an air traffic control system such as an airport surface monitoring device has been described as an example, but it can also be applied to other monitoring devices such as maritime search, anti-aircraft search, and in that case, Various parameters, observation periods, tracking conditions, etc. are set appropriately according to the system to be applied.

It is a block block diagram which shows the target detection apparatus by one Embodiment of this invention. It is a partial block block diagram which shows the specific structure of the target detection processing apparatus 7 shown in FIG. It is a flowchart figure which shows the processing content of the target detection apparatus which concerns on this invention as shown in FIG. FIG. 4 is an explanatory diagram for explaining the contents of the multipath region, the echo region, and the target region, and is a region explanatory diagram schematically showing, for example, the state of the airport surface. It is a state transition diagram which shows the state transition of the received signal accompanying the series of processes shown in FIG. FIG. 10 is an explanatory diagram of a display screen showing an example of a display screen such as a tracking process result displayed on the display device 6. FIG. 10 is an explanatory diagram of a display screen showing an example of a display screen such as a tracking process result displayed on the display device 6.

Explanation of symbols

1 radar device, 2 signal processing means, 3 tracking means, 4 target judging means,
5 display processing means, 6 display device, 7 target detection processing device, 8 correlation processing unit,
9 tracking processing unit, 10 region determination processing unit, 11 state determination processing unit,
17 multipath area, 18 echo area.

Claims (5)

The position of the target is detected from the received signal of the radar device, and it is determined that the target is in the state determination region by the region determination means for determining whether or not the target is in a state determination region provided in advance. When the movement distance or tracking reliability of the target object satisfies a predetermined condition, it is determined as a moving target object, and when the movement distance or tracking reliability does not satisfy the predetermined condition even if a predetermined time elapses, a false target object is determined. A state determination unit for determining; a tracking unit for performing tracking processing of the target determined to be in the state determination region according to a determination result of the state determination unit; and a display device for displaying a processing result of the tracking unit; A target detection apparatus. The position of the target is detected from the radar device and the received signal of the radar device, and when the target is in a state determination area provided in advance, the target is based on the moving distance or tracking reliability of the target. Is determined as a moving target or a fake target, and when the target is outside the state determination area, target determination means for determining the target as a moving target or a fake target from the position information of the target A tracking unit for performing tracking processing of the target determined to be outside the state determination region and the state determination region according to the determination result of the target determination unit, and a display device for displaying the processing result of the tracking unit And a target detection device. 4. The display device according to claim 1, wherein the tracking result of the target determined to be the moving target is displayed, and the tracking result of the target determined to be the false target is not displayed. 5. Target detection device according to A radar apparatus that transmits and receives radio waves to and from the airport surface, and an area determination unit that detects a position of a target from a received signal obtained from the radar apparatus and determines whether or not the target is in a state determination area provided in advance. When the movement distance or tracking reliability of the target determined to be in the state determination area by this area determination means satisfies a predetermined condition, it is determined as a moving target, and the movement distance or tracking reliability has a predetermined time. If the predetermined condition is not satisfied even after elapses, a state determination unit that determines that the object is a fake target, and a tracking that performs a tracking process of the target determined to be in the state determination region according to the determination result of the state determination unit And a display device that displays the processing result of the target determined as the moving target by the state determination means among the processing results of the tracking means, and hides the processing result of the fake target. With features Air traffic control system that. 6. The air traffic control system according to claim 5, wherein the state determination area is provided in an initial detection prohibition area where a clutter or a multipath signal is generated.

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