JP4901540B2 - Airport surface monitoring device - Google Patents

Description

  The present invention relates to an airport surface monitoring device for monitoring an airport surface of an airport.

  A conventional airport surface monitoring device for monitoring an airport surface of an airport is configured by using one radar site that covers the entire area of the airport surface. However, when the airport is enlarged, the coverage area of one radar site cannot cover the entire area of the airport surface, so the coverage area is expanded by using two or more radar sites. Patent Document 1 below discloses a technique for avoiding radio wave interference between radars in a radar apparatus using a plurality of radars using the same frequency. However, nothing is disclosed about the aircraft detection function by each radar.

JP 2004-325130 A

  In an airport surface monitoring apparatus using two or more radar sites, in order to cover the entire airport surface without omission, the coverage area of each of the two radar sites is formed so as to partially overlap each other in the overlapping area. It is possible. In this case, in the superimposition area, an aircraft that cannot be detected at one radar site due to a blind spot of the radar can be captured at another radar site. However, since the aircraft existing in the overlapping area is captured by each of the two radar sites, it is difficult to recognize the aircraft captured by each radar site as the same aircraft.

  In response to such a problem, the present invention proposes an airport surface monitoring apparatus for an airport that has been improved so that an aircraft can be easily recognized even in a superimposed area.

An airport surface monitoring apparatus according to the present invention includes a first radar site that covers a first coverage area of an airport surface where an aircraft exists, and a second radar site that covers a second coverage area of the airport surface, The coverage area and the second coverage area partially overlap each other in the overlapping area, and is an airport surface monitoring device that monitors an airport surface in which at least one reference point is installed in the overlapping area,
A first site target detector for processing a first site radar video signal from the first radar site and outputting a first site target detection signal; a second site radar video signal from the second radar site; The second site target detection unit that outputs the target detection signal of the second site, receives the target detection signal of the first site and the target detection signal of the second site, and a site selection processing means for selecting and outputting a display device for displaying the position of the aircraft based on the output of the site selection constant processing means, corresponding to the reference points contained in the target detection signal of the first site A first reference point detection signal and a second reference point detection signal corresponding to the reference point included in the target detection signal of the second site are extracted, and these first and second reference point detections are extracted. Signal quality Quality determination means for outputting a reference point quality signal, and site map setting means including a plurality of site maps for setting a passing area for each of the target detection signal for the first site and the target detection signal for the second site And
Each of the plurality of site maps sets a passing area for each of the target detection signal for the first site and the target detection signal for the second site corresponding to the overlap area, and the first map corresponding to the overlap area. The site map setting means is configured to set pass areas of different patterns in the target detection signal of the second site, and to set pass areas of different patterns in the target detection signal of the second site corresponding to the overlap area. Selects a predetermined site map from the plurality of site maps based on the reference point quality signal, and selects the first site target detection signal and the first site based on the selected predetermined site map. A passing area is set in the target detection signals of two sites, and the site selection processing means is configured to perform the first based on the reference point quality signal. And selecting the target detection signal site and one of the second site target detection signal.

  In the airport surface monitoring apparatus according to the present invention, the site selection processing means selects and outputs either the first site target detection signal from the first radar site or the second site target detection signal from the second radar site. Even in the overlap area, since the position of the aircraft is displayed on the display device based on either the target detection signal of the first site or the target detection signal of the second site, the aircraft can be easily recognized, and the wrong aircraft is recognized. Can be prevented.

  At the same time, in the airport surface monitoring device according to the present invention, the site map setting means selects a predetermined site map from a plurality of site maps based on the reference point quality signal, and the selected predetermined site map is selected. Based on the first site target detection signal and the second site target detection signal, and the site selection processing means determines the first site target detection signal and the second site based on the reference point quality signal. Since one of the site target detection signals is selected, an optimal site map is assigned according to the reference point quality signal, and the first site target detection signal and the second site target detection signal are optimally selected. The position of the aircraft can be displayed accurately.

  Several embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing Embodiment 1 of an airport surface monitoring apparatus according to the present invention. The airport surface monitoring apparatus according to the first embodiment includes a plurality of radar sites that monitor the airport surface 1 of the same airport, for example, two first radar sites 10 and second radar sites 20, and common signal processing common to them. A block 50 and a display device 80 are provided. It is also possible to provide three or more radar sites. In this case, the common signal processing block 50 and the display device 80 are installed in common at three or more radar sites.

  FIG. 2 is a plan view of the airport surface 1 monitored by the airport surface monitoring apparatus according to the first embodiment. A plurality of interference green spaces 2a to 2h are arranged on the airport surface 1, and a runway or taxiway 3 is formed between the interference green spaces 2a to 2h. It is assumed that there is a moving aircraft 4 on this runway or taxiway 3 and its position changes from position 4a to position 4c. Reference points 5a to 5d are installed in the interference green spaces 2e to 2h, respectively. The reference points 5a to 5d are constituted by, for example, a reference sign or a reference building.

  The first radar site 10 has a first covered area 10a, and the second radar site 20 has a second covered area 20a. The first and second radar sites 10 and 20 are installed such that the first covered area 10 a and the second covered area 20 a partially overlap in the overlapping area 30. As a result, the first covered area 10 a and the second covered area 20 a are divided into the overlapping area 30 and the single areas 31 and 32. The single area 31 is an area excluding the overlapping area 30 in the first covered area 10a, and the single area 32 is an area excluding the overlapping area 30 in the second covered area 20a. In the example of FIG. 2, the overlapping area 30 is formed so as to cover almost the right half of the interference green spaces 2b and 2f, cover almost the left half of the interference green spaces 2c and 2g, and cover the reference points 5b and 5c. Is done. The single area 31 covers the entire interference green spaces 2a and 2e, and covers almost the left part of the interference green spaces 2b and 2f. The single area 32 covers the entire interference green areas 2d and 2h, and covers almost the right part of the interference green areas 2c and 2g. It is assumed that the position 4 a of the moving aircraft 4 is located in the single area 31, the position 4 b is located in the overlapping area 30, and the position 4 c is located in the single area 32.

  The first radar site 10 has a target detection unit 11 for the first site, and the second radar site 20 has a target detection unit 21 for the second site. The target detection unit 11 at the first site receives the radar video signal Sv1 from the first radar site 10 and outputs a target detection signal St1 at the first site. The target detection unit 21 at the second site receives the radar video signal Sv2 from the second radar site 20 and outputs a target detection signal St2 at the second site.

  The target detection unit 11 at the first site and the target detection unit 21 at the second site are configured in the same manner. The target detection unit 11 of the first site includes an A / D conversion unit 12, a threshold level verification unit 13, a target detection map generation unit 14, a contraction processing unit 15, a two-dimensional moving average processing unit 16, and a barycentric position. A detection processing unit 17 is included. The second site target detection unit 21 includes an A / D conversion unit 22, a threshold level test unit 23, a target detection map generation unit 24, a contraction processing unit 25, a two-dimensional moving average processing unit 26, A gravity center position detection processing unit 27 is included.

  The A / D converter 12 of the target detector 11 at the first site receives the radar video signal Sv1 at the first site and converts it into a digital signal. The threshold level verification unit 13 receives the digital signal output from the A / D conversion unit 12 and reflects from the aircraft 4 and the reference points 5a, 5b, and 5c in the first covered area 10a including the overlapping area 30 and the single area 31. Identify waves and clutter. The target detection map generation unit 14 is coupled to the threshold level verification unit 13 and sets the interference green spaces 2a, 2b, 2c, 2e, 2f, and 2g in the first covered area 10a including the overlapping area 30 and the single area 31 as blanks. . However, the reflected waves from the reference points 5a, 5b, and 5c installed in the interference green spaces 2e, 2f, and 2g pass through the threshold level verification unit 13 without being blanked by the target detection map generation unit 14. Configured.

  The contraction processing unit 15 receives the output signal of the threshold level verification unit 13 and performs a known contraction process, for example, spike-like reflections scattered around the reflected waves from the aircraft 4 and the reference points 5a, 5b, and 5c. Suppress the wave. A two-dimensional moving average processing unit 16 is also known, and the two-dimensional moving average processing unit 16 reflects reflected waves from the aircraft 4 and the reference points 5a, 5b, and 5c that are narrowed on the display screen by the contraction processing of the contraction processing unit 15. A moving average process is performed to restore. The center-of-gravity position detection processing unit 17 detects the center-of-gravity positions of the aircraft 4 and the reference points 5a, 5b, and 5c in the first covered area 10a including the overlapping area 30 and the single area 31, and serves as the target detection signal St1 for the first site. Output. The target detection signal St1 for the first site includes an aircraft detection signal Sa1 and a reference point detection signal Ss1. The aircraft detection signal Sa1 indicates the position of the center of gravity of the aircraft 4 in the first covered area 10a including the overlapping area 30 and the single area 31, and the reference point detection signal Ss1 is the first cover including the overlapping area 30 and the single area 31. The barycentric positions of the reference points 5a, 5b, and 5c in the area 10a are shown.

  The A / D converter 22 of the target detector 21 at the second site receives the radar video signal Sv2 at the second site and converts it into a digital signal. The threshold level test unit 23 receives the digital signal output from the A / D conversion unit 22 and reflects from the aircraft 4 and the reference points 5b, 5c, and 5d in the second covered area 20a including the overlapping area 30 and the single area 32. Identify waves and clutter. The target detection map generation unit 24 is coupled to the threshold level test unit 23 and sets the interference green spaces 2b, 2c, 2d, 2f, 2g, and 2h in the second covered area 20a including the overlapping area 30 and the single area 32 as blanks. . However, the reflected waves from the reference points 5b, 5c, and 5d installed in the interference green spaces 2f, 2g, and 2h pass through the threshold level test unit 23 without being blanked by the target detection map generation unit 24. Configured.

The contraction processing unit 25 receives the output signal of the threshold level verification unit 23 and performs a known contraction process, for example, spike-like reflections scattered around the reflected waves from the aircraft 4 and the reference points 5b, 5c, and 5d. Suppress the wave. A two-dimensional moving average processing unit 26 is also known, and the secondary moving average processing unit 26 reflects reflected waves from the aircraft 4 and the reference points 5b, 5c, and 5d that are narrowed on the display screen by the contraction processing of the contraction processing unit 25. A moving average process is performed to restore. The center-of-gravity position detection processing unit 27 detects the center-of-gravity positions of the aircraft 4 and the reference points 5b, 5c, and 5d in the second covered area 20a including the overlapping area 30 and the single area 32, and serves as the target detection signal St2 for the second site. Output. The target detection signal St2 for the second site includes an aircraft detection signal Sa2 and a reference point detection signal Ss2. The aircraft detection signal Sa2 indicates the position of the center of gravity of the aircraft 4 in the second covered area 20a including the overlapping area 30 and the single area 32, and the reference point detection signal Ss2 is a second cover including the overlapping area 30 and the single area 32. The barycentric positions of the reference points 5b, 5c, and 5d in the area 20a are shown.

  The shrinkage processing by the shrinkage processing units 15 and 25 and the moving average processing by the two-dimensional moving average processing units 16 and 26 are described in detail in Japanese Patent Application Laid-Open No. 2000-292525. To do.

Next, the common signal processing block 50 will be described. The common signal processing block 50 is configured to perform signal processing by computer software, and includes a main signal processing system 60 and a sub signal processing system 70. Main signal processing system 60 includes a site selection processing means 61, a tracking filter means 62, a tracking quality determination unit 63, a data format generating means 6 4. The sub signal processing system 70 includes a reference point detection signal extraction unit 71, a tracking filter unit 72, a tracking quality determination unit 73, a site map adjustment unit 74, and a site map setting unit 75.

  The site selection processing means 61 of the main signal processing system 60 receives the target detection signal St1 of the first site and the target detection signal St2 of the second site, performs site map processing on each of them, and also performs site map processing. A selection process is performed to select one of the target detection signals St1 and St2 of the first site and the second site received. The target detection signal St1 or St2 of the first site or the second site output from the site selection processing unit 61 is sent to the tracking filter unit 62. The tracking filter means 62 is composed of, for example, a Kalman filter, which is a general tracking filter, and performs target tracking. A target tracking signal Sac is output from the tracking filter means 62 and sent to the tracking quality determination means 63.

  The tracking quality determination unit 63 receives the target tracking signal Sac and determines the target tracking quality. The tracking quality determination means 63 also manages the past history of each target, and gives the tracking quality depending on whether the tracking continuity is high or low. The tracking quality determination means 63 determines the target tracking quality based on the missing detection positions of the targets in the past several scans, the variance in the tracking gate, and the like. The data format generation unit 64 receives the target tracking signal Sac output from the tracking quality determination unit 63, converts it into a prescribed data format, and supplies it to the display device 80.

  The reference point detection signal extracting means 71 receives the target detection signals St1 and St2 of the first site and the second site, and extracts only the reference point detection signals Ss1 and Ss2 included in them. The tracking filter unit 72 is configured by a general Kalman filter or the like, like the tracking filter unit 62, and outputs reference point detection signals Ss1 and Ss2 from which fluctuations of the reference point detection signals Ss1 and Ss2 are removed. The tracking quality determination unit 73 receives the reference point detection signals Ss1 and Ss2 output from the tracking filter unit 72, determines the quality of the reference point detection signals Ss1 and Ss2, and determines the quality of the reference point detection signals Ss1 and Ss2. A quality evaluation signal Sqe is output. The site map adjustment means 74 outputs a site map adjustment signal Ssm corresponding to the quality evaluation signal Sqe, and supplies this site map adjustment signal Ssm to the site map setting means 75.

  The site map setting means 75 incorporates a plurality of at least two site maps SMa and SMb, and selects a predetermined site map from these site maps SMa and SMb based on the site map adjustment signal Ssm. It supplies to the selection processing means 61. The site map SMa includes a site map SMa1 on the first site side and a site map SMa2 on the second site side, and the site map SMb includes a site map SMb1 on the first site side and a site map SMb2 on the second site side. Including.

  Each site map SMa1 and SMb1 on the first site side is a passing area through which the target detection signal St1 is passed with respect to the target detection signal St1 of the first site inside the first coverage 10a of the first radar site 10. Set. In particular, in the overlapping area 30, the site maps SMa1 and SMb1 on the first site side have different patterns of the passing areas. The site maps SMa2 and SMb2 on the second site side pass the target detection signal St2 with respect to the target detection signal St2 of the second site inside the second coverage 20a of the second radar site 20. Set the area. In particular, in the overlapping area 30, the site maps SMa2 and SMb2 on the second site side have mutually different patterns of passing areas.

  This will be specifically described with reference to FIGS. FIG. 3 exemplifies the site map SMa with dotted lines, and this site map SMa includes a site map SMa1 on the first site side and a site map SMa2 on the second site side. FIG. 4 illustrates the site map SMb by a dotted line, and the site map SMb includes a site map SMb1 on the first site side and a site map SMb2 on the second site side. The site maps SMa1 and SMb1 are passing areas through which the target detection signal St1 of the first site passes within the first covered area 10a, and outside the site maps SMa1 and SMb1, the target is set within the first covered area 10a. Even if the detection signal St1 is obtained, the target detection signal St1 is masked and does not pass. The site maps SMa2 and SMb2 are passing areas that allow the target detection signal St2 of the second site to pass within the second covered area 20a, and outside the site maps SMa2 and SMb2, the target is set inside the second covered area 20a. Even if the detection signal St2 is obtained, the target detection signal St2 is masked and does not pass.

  3 and 4, in the overlapping area 30, the patterns of the passing areas of the site maps SMa1 and SMb1 on the first site side are different from each other, and the patterns of the passing areas of the site maps SMa2 and SMb2 on the second site side are different. Are clearly different from each other. In the overlapping area 30, the site maps SMa1 and SMb1 on the first site side and the site maps SMa2 and SMb2 on the second site side are adjacent to each other, and almost the entire area of the overlapping area 30 in the site maps SMa1 and SMa2 The maps SMb1 and SMb2 cover almost the entire overlap area 30.

  The site map SMa1 on the first site side of the site map SMa in FIG. 3 is adjacent to the left edge of the site map SMa2 in the overlap area 30. The right edge of the site map SMa1 on the first site side passes through the left end portions of the interference green spaces 2c and 2g. As a result, the site map SMa1 has the interference green spaces 2a, 2b, 2e, and 2f and the reference point 5a, It has a pattern passage area covering 5b. In the overlapping area 30, the site map SMa1 has a pattern passing area that covers substantially the right part of the interference green spaces 2b and 2f and the reference point 5b. The site map SMa2 on the second site side of the site map SMa of FIG. 3 has its left edge passing through the left end of the interference green space 2c, 2g in the overlap area 30, and as a result, the site map SMb1 2d, 2h, most of the interference green areas 2c, 2g, and a passing area of a pattern covering the reference points 5c, 5d. In the overlap area 30, the site map SMa2 is substantially the left part of the interference green areas 2c, 2g. Has a pattern passage area that covers

  The site map SMb1 on the first site side of the site map SMb in FIG. 4 is adjacent to the left edge of the site map SMb2 on the second site side in the overlap area 30. The right edge of the site map SMb1 on the first site side passes through the right end portions of the interference green spaces 2b and 2f. As a result, the site map SMb1 includes the entire interference green spaces 2a and 2e, and the interference green spaces 2b and 2f. It has a pattern passage area covering almost the whole and the reference points 5a and 5b. In the overlapping area 30, the site map SMb1 has a pattern passing area that covers the right part of the interference green spaces 2b and 2f and the reference point 5b. The site map SMb2 on the second site side of the site map SMb in FIG. 4 has its left edge passing through the right end of the interference green spaces 2b and 2f in the overlap area 30, and as a result, the site map SMb2 is the interference green space 2c. 2d, 2g, 2h, and a passing area of a pattern that covers the reference points 5c, 5d. In the overlapping area 30, the site map SMb2 has a passing area of a pattern that covers the left part of the interference green space 2c, 2g. ing.

  The reference point detection signal Ss1 in the target detection signal St1 of the first site includes reflected waves from the reference points 5a, 5b, and 5c, and the reference point detection signal Ss2 in the target detection signal St2 of the second site is , Including reflected waves from the reference points 5b, 5c, and 5d. The quality evaluation signal Sqe from the tracking quality determination means 73 represents the quality of the reflected wave from each of the reference points 5a to 5d. In particular, the reflected wave from the reference points 5b and 5c is both the reference point detection signals Ss1 and Ss2. And the reflected wave signal Ss1b of the reference point 5b in the reference point detection signal Ss1, the reflected wave signal Ss1c of the reference point 5c in the reference point detection signal Ss1, and the reference in the reference point detection signal Ss2. The reflected wave signal Ss2b at the point 5b and the reflected wave signal Ss2c at the reference point 5c in the reference point detection signal Ss2 are individually evaluated for quality.

  The reflected wave signals Ss1b, Ss1c, Ss2b, and Ss2c are considered to have the highest quality evaluation if they are large and stable over a predetermined scan of each radar site 10 and 20. If the size is small, the quality is evaluated as low, and if the size varies greatly over a predetermined scan, the quality is evaluated as low.

  Now, when the aircraft 4 is located at the position 4a shown in FIG. 3, does not exist in the overlapping area 30, and is located in the single area 31, the site selection processing means 61 selects the target detection signal St1 of the first site. To do. The target detection signal St1 of the first site is supplied to the data format generation unit 64 through the tracking filter unit 62 and the tracking quality determination unit 63 and displayed on the display device 80. The tracking target signal Sac from the tracking filter unit 62 is supplied to the site map adjusting unit 74 through the tracking quality determining unit 63. The site selection processing means 61 selects the target detection signal St1 of the first site so that the aircraft 4 at the position 4a is detected in the tracking target signal Sac. In this case, since the aircraft 4 does not exist in the overlapping area 30, the site map adjustment operation by the site map adjustment means 74 and the site map setting means 75 is not performed, and the target detection signal St1 of the first site includes the site map SMa, SMb is not given.

When the aircraft 4 is located in the superimposition area 30, the site map adjustment unit 74 detects that the aircraft 4 has moved to the superposition area 30 based on the tracking target signal Sac of the tracking filter unit 62, and based on the quality evaluation signal Sqe. The site map adjustment signal Ssm is generated. When the aircraft 4 is located at the position 4b in the overlapping area 30, the site map setting means 75, based on the quality evaluation signal Sqe, for example, the optimum in the site map SMa shown in FIG. 3 and the site map SMb shown in FIG. of select a site map, together, selecting the first optimum target detection signal in the target detection signal St1, St2 of the second site.

  The tracking quality evaluation means 73 uses the reflected wave signals Ss1b and Ss1c from the reference points 5b and 5c included in the reference point detection signal Ss1 and the reflected wave signals from the reference points 5b and 5c included in the reference point detection signal Ss2. As a result of the comparison, a quality evaluation signal Sqe is generated. For example, when the reflected wave signal Ss1b has the highest evaluation among the reflected wave signals Ss1b, Ss1c, Ss2b, and Ss2c, the site map adjustment signal Ssm is obtained from the site map SMa shown in FIG. This is a signal for selecting the site map SMa1 in the site map SMa. Based on this site map adjustment signal Ssm, the site map setting means 75 selects the site map SMa, and the site selection processing means 61 The target detection signal St1 for one site is selected.

  Of the reflected wave signals Ss1b, Ss1c, Ss2b, and Ss2c, the reflected wave signal Ss1b has the highest evaluation. This means that it is optimal to give and display, and based on the selection of the site map SMa by the site map setting means 75 and the selection of the target detection signal St1 of the first site by the site selection processing means 61, the aircraft 4 optimal displays can be obtained.

Reflected wave signal Ss1b, Ss1c, Ss2b, in Ss2c, for example, when the reflected wave signal Ss 2 c becomes highest rating, sitemap adjustment signal Ssm selects the sitemap SMb shown in FIG. 4, further site This is a signal for selecting the site map SMb2 in the map SMb. Based on this site map adjustment signal Ssm, the site map setting means 75 selects the site map SMb, and the site selection processing means 61 is used for the second radar site 20. The target detection signal St2 is selected.

Reflected wave signal Ss1b, Ss1c, Ss2b, in Ss2c, the reflected wave signal Ss 2 c becomes the highest evaluation, the aircraft 4 in superimposition area 30, sitemap target detection signal St2 of the second site This means that it is optimal to display with SMb2, and based on the selection of the site map SMb by the site map setting means 75 and the selection of the target detection signal St2 of the first site by the site selection processing means 61. The optimum display of the aircraft 4 can be obtained.

  When the aircraft 4 is located in the overlapping area 30, the reflected wave signal of the aircraft 4 is captured by both the first and second radar sites 10 and 20, and the target detection signals St1 and St2 are both aircraft. 4, the target selection signals St1 and St2 of the first and second radar sites 10 and 20 are selected by the site selection processing means 61, so that the display screen of the display device 80 is displayed. Above, the reflected wave signal of the aircraft 4 is merely one, and two identical aircraft are not displayed on the display screen, and the misidentification of the aircraft 4 is eliminated.

  In addition, the site maps SMa, SMb corresponding to the reflected wave signal having the highest evaluation among the quality evaluations of the reflected wave signals Ss1b, Ss1c, Ss2b, Ss2c from the reference points 5b, 5c in the overlapping area 30. Is selected, and the target detection signals St1 and St2 are selected. Therefore, an optimal site map is assigned according to the reference point quality signal Sqe, and the target detection signal St1 and the second detection signal of the first site are added. The site target detection signal St2 can be optimally selected, and the position of the aircraft 4 can be accurately displayed.

  When the aircraft 4 is located at the position 4c shown in FIGS. 3 and 4 and does not exist in the overlapping area 30 but is located in the single area 32, the site selection processing means 61 outputs the target detection signal St2 of the second site. select. The target detection signal St2 of the second site is supplied to the data format generation unit 64 through the tracking filter unit 62 and the tracking quality determination unit 63 and displayed on the display device 80. The tracking target signal Sac from the tracking filter unit 62 is supplied to the site map adjusting unit 74 through the tracking quality determining unit 63. The site selection processing means 61 selects the target detection signal St2 for the second site such that the aircraft 4 at the position 4c is detected in the tracking target signal Sac. In this case, since the aircraft 4 does not exist in the overlapping area 30, the site map adjustment operation by the site map adjustment means 74 and the site map setting means 75 is not performed, and the target detection signal St1 of the first site includes the site map SMa, SMb is not given.

  The site map setting means 75 is not limited to the two site maps SMa and SMb, and can incorporate a plurality of site maps having different passing areas in at least the overlapping area 30, in this case, An optimum site map is selected from a plurality of site maps according to the evaluation of the reflected wave signals Ss1b, Ss1c, Ss2b, and Ss2c.

  Moreover, it is not restricted to what installs the two reference points 5b and 5c in the overlapping area 30, and more than two reference points can be installed in the overlapping area 30. In this case, the optimal site map is selected according to the quality evaluation of the reflected wave signal from each reference point included in the target detection signals St1 and St2 of the first and second sites, and the optimal target detection signal Is selected. It is also possible to simply set one reference point in the overlapping area 30. In this case, the optimal site map is selected according to the quality evaluation of the reflected wave signal from one reference point included in the target detection signals St1 and St2 of the first and second sites, and the optimal target detection is performed. A signal is selected.

Embodiment 2. FIG.
FIG. 5 is a block diagram showing Embodiment 2 of the airport surface monitoring apparatus according to the present invention. In the second embodiment, the site map adjustment means 74 in the first embodiment is replaced with a site map adjustment adjustment means 74A. The other configuration is the same as that of the first embodiment.

When the airport surface 1 includes complicated terrain, the reflected wave signal from the reference points 5a to 5d may not be obtained, and the quality evaluation signal Sqe may not be obtained from the reference point detection signals Ss1 and Ss2. For example, for a complex topography airport surface 1, when the aircraft 4 moves the guide path 3 of the superposition area 30, the shadow of the radar aircraft 4, the reflected wave signal Ss1b reference point 5b, Ss 2b or The reflected wave signals Ss 1c and Ss2c at the reference point 5c may not be detected temporarily. In such a case, the reflected wave signal Ss1b, Ss 2b or reflected wave signal Ss 1c, in accordance with the temporary loss of Ss2c, it is wasteful to switch sitemap SMa, the SMb, even a false indication of the aircraft There is a danger.

Site Map adjusting means 74A receives the tracking target signal Sac the tracking filter 62, in the superimposition area 30, the aircraft 4 and the reference point 5b, and the 5c becomes a predetermined positional relationship, the reflected wave signal Ss1b, Ss 2b or When the reflected wave signals Ss 1c and Ss2c disappear temporarily, the switching of the site map adjustment signal Ssm is prohibited, and the site map setting means 75 is prohibited from selecting a different site map and selected before that. Works to continue selecting sitemaps. By using this site map adjusting means 74A, it is possible to prevent useless switching of the site map and to prevent erroneous display of the aircraft.

Embodiment 3 FIG.
FIG. 6 is a block diagram showing Embodiment 3 of the airport surface monitoring apparatus according to the present invention. In the third embodiment, the site map adjusting means 74 in the first embodiment is replaced with a site map adjusting means 74B. The site map adjustment means 74B generates an erroneous target number signal Sne together with the site map adjustment signal Ssm. These site map adjustment signal Ssm and the erroneous target number signal Sne are the target detection units 11 of the first site and the second site. , 21 are also supplied to the target detection map generators 14 and 24 to adjust the threshold levels of the threshold level testers 13 and 23, respectively. The other configuration is the same as that of the first embodiment.

  The target detection signals St1 and St2 of the first site and the second site output from the target detection units 11 and 21 of the first site and the second site include the aircraft detection signals Sa1 and Sa2 and the reference point detection signals Ss1 and Ss2. There may also be mis-targets. This mistarget can occur for a variety of reasons.For example, if a type of virtual image called clutter becomes a mistarget, or if a multipath virtual image is detected by reflecting an aircraft reflected wave signal again on the aircraft, The case where it becomes becomes possible. When such mistargets increase, the processing capacity of the target detection units 11 and 12 at the first site and the second site is exceeded, and there is a risk of causing processing delay or hang-up.

  The site map adjusting unit 74B is supplied with the tracking target signal Sac from the tracking filter unit 62, and the tracking target signal Sac includes the erroneous target. The site map adjusting means 74B according to the second embodiment generates an erroneous target number signal Sne that depends on the number of erroneous targets included in the tracking target signal Sac together with the site map adjusting signal Ssm. The site map adjustment signal Ssm acts on the site map setting means 75 and the site selection processing means 61 as in the first embodiment, and selects the site map and the target detection signals St1, St2 of the first site and the second site. Make a selection.

  The erroneous target number signal Sne acts on the threshold level verification units 13 and 23 from the target detection map verification unit 14 and 24, and the threshold level for the digital signal from the A / D converters 12 and 22 is set according to the erroneous target number. adjust. When the number of erroneous targets is large, the threshold levels of the threshold level verification units 13 and 14 are increased and the erroneous targets are decreased within a range where the aircraft detection signals Sa1 and Sa2 are not lost. With this configuration, the target detection units 11 and 12 at the first and second sites do not exceed the processing capacity due to an erroneous target, and the processing delay or hang-up can be avoided.

Embodiment 4 FIG.
FIG. 7 is a block diagram showing Embodiment 4 of the airport surface monitoring apparatus according to the present invention. In the fourth embodiment, the site map adjusting means 74 of the first embodiment is replaced with a site map adjusting means 74C. In addition to the tracking target signal Sac, the site map adjustment unit 74C is supplied with a quality evaluation signal Sqe from the tracking quality evaluation unit 73 and a weather state signal Sw from the weather state determination unit 76. A rain gauge 77 installed at various locations on the airport surface 1 is connected to the weather condition determination means 76. The other configuration is the same as that of the first embodiment.

  The tracking quality evaluation unit 73 evaluates the quality of the reflected wave signal from each of the reference points 5a to 5d, but external factors such as attenuation of radio wave propagation are added to the radar under climatic conditions such as rainfall. Therefore, if the evaluation criteria in fine weather are applied as they are in rainy weather, there is a risk that erroneous evaluation will be performed. The site map adjusting means 74C according to the fourth embodiment receives the weather condition signal Sw in addition to the quality evaluation signal Sqe, and adjusts the evaluation standard for the quality evaluation signal Sqe depending on the weather condition signal Sw. An adjustment signal Ssm is generated. With this configuration, it is possible to more accurately evaluate the quality evaluation signal Sqe and obtain a more accurate site map adjustment signal Ssm. More accurate site map selection and target detection signals St1 for the first site and the second site can be obtained. , St2 can be selected.

  The airport surface monitoring device according to the present invention is used as a device for monitoring the airport surface of an airport.

It is a block diagram which shows Embodiment 1 of the airport surface monitoring apparatus by this invention. It is a top view which shows an example of an airport surface. 3 is a plan view showing an example of a site map according to Embodiment 1. FIG. It is a top view which shows the other example of the site map by Embodiment 1. FIG. It is a block diagram which shows Embodiment 2 of the airport surface monitoring apparatus by this invention. It is a block diagram which shows Embodiment 3 of the airport surface monitoring apparatus by this invention. It is a block diagram which shows Embodiment 4 of the airport surface monitoring apparatus by this invention.

Explanation of symbols

10: first radar site, 11: first site target detection unit, 20: second radar site,
21: Target detection unit of the second site, 61: Site selection processing unit,
71: Reference point detection signal extraction means, 73: Quality determination means, 75: Site map setting means,
76: Weather condition determination means, 80: Display means.

Claims (4)

A first radar site that covers a first coverage area of an airport surface where an aircraft exists; and a second radar site that covers a second coverage area of the airport surface, wherein the first coverage area and the second coverage area include: An airport surface monitoring device for monitoring an airport surface that partially overlaps each other in the overlap area and at least one reference point is installed in the overlap area,
A target detection unit for a first site that processes a radar video signal of the first site by the first radar site and outputs a target detection signal for the first site;
A second site target detection unit for processing a radar video signal of the second site by the second radar site and outputting a target detection signal of the second site;
Site selection processing means for receiving the target detection signal of the first site and the target detection signal of the second site, and selecting and outputting one of them;
A display device for displaying the position of the aircraft based on the output of the site selection constant processing means,
A first reference point detection signal corresponding to the reference point included in the target detection signal at the first site, and a second reference inspection corresponding to the reference point included in the target detection signal at the second site. leaving extracts the signal, the first of these, a quality judging means for outputting a reference point quality signal representing the quality of the second reference point detection signal,
Site map setting means including a plurality of site maps for setting a passing area for the target detection signal of the first site and the target detection signal of the second site,
Each of the plurality of site maps sets a passing area for each of the target detection signal for the first site and the target detection signal for the second site corresponding to the overlap area, and the first map corresponding to the overlap area. Set different pass areas in the target detection signal, and set different pass areas in the target detection signal of the second site corresponding to the overlap area,
The site map setting means selects a predetermined site map from the plurality of site maps based on the reference point quality signal, and based on the selected predetermined site map, the target of the first site A passing area is set in the detection signal and the target detection signal of the second site, and the site selection processing means is configured to detect the target detection signal of the first site and the target of the second site based on the reference point quality signal. An airport surface monitoring device, wherein one of detection signals is selected. A airport surface monitoring device according to claim 1, wherein the reference point and the aircraft Ri predetermined positional relationship near, when said first or second reference point detection signal can not be detected, the sitemap An airport surface monitoring device characterized by prohibiting switching.   2. The airport surface monitoring apparatus according to claim 1, wherein the signals of the target detection unit of the first site and the target detection unit of the second site are based on the number of erroneous targets included in the output of the site selection processing means. An airport surface monitoring device characterized by adjusting a threshold level in processing. The airport surface monitoring apparatus according to claim 1, further comprising a weather condition determination unit, wherein the site map setting unit selects the site map depending on an output of the weather condition determination unit. Features an airport surface monitoring device.

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