A display method for radar vertical coverage map

Abstract

The invention discloses a method for displaying a radar vertical coverage map. Without adding any hardware, the method uses distance as the horizontal axis and altitude as the vertical axis to display the target track in real time in a vertical plane rectangular coordinate system according to the altitude and distance. The method saves and displays the complete track of each target currently existing in real time within the radar monitoring range. All targets appearing in a specified time period are superimposed and displayed in the vertical plane coordinate system in the form of full tracks. Screen shots are taken for comparison at different periods to determine whether the radar's overhead blind area and low elevation angle detection blind area have changed, thereby providing a basis for changing and maintaining radar performance, and also providing a basis for mutual blindness compensation in radar multiple coverage and site selection for new radars.

Description

Technical Field

[0001] The invention belongs to the technical field of radar display, and in particular relates to a display technology of a vertical power coverage map. Background Art

[0002] As a device for monitoring aerial targets, the power coverage range of air traffic control radar is one of the key indicators. The radar beam is three-dimensional. In addition to the corresponding horizontal coverage at different altitudes, its vertical power coverage is also an indicator that needs attention. On the one hand, the range of horizontal power coverage is proportional to the altitude. The higher the altitude, the larger the coverage range. The low altitude area is affected by the curvature of the earth, forming a low elevation angle detection blind area. On the other hand, in order to increase the effective range of the radar, the radar beam will be shaped. Radar has an overhead blind area. The overhead blind area and the detection blind area are as follows: Figure 1 shown.

[0003] Professional software can generate horizontal power coverage maps based on relevant radar parameters, but cannot generate vertical power coverage maps. Professional software cannot input the beam shapes of various radars, and the horizontal power coverage maps drawn do not have overhead blind areas, and can only calculate long-distance detection blind areas based on the curvature of the earth.

[0004] When selecting a new radar site, it is necessary to prevent the route from passing through the blind area of ​​the overhead space, so as to avoid missing routes in the coverage of the new radar. If a new route passes through the blind area of ​​the existing radar, it is necessary to consider relocating the radar. In order to improve the reliability of radar monitoring in terms of radar coverage, it is necessary to ensure at least two layers of coverage of key airspace. If it is unavoidable for the route to pass through the blind area of ​​the overhead space, it is necessary to consider using adjacent radars to fill the blind spot. Summary of the invention

[0005] In order to solve the problem of displaying target tracks by distance and azimuth in the prior art, the present invention proposes a method for displaying a radar vertical coverage map to intuitively reflect the vertical coverage of the radar. In order to achieve the above purpose, the present invention adopts the following technical solutions.

[0006] Display the radar target track in the vertical plane rectangular coordinate system: establish a vertical plane rectangular coordinate system, with distance as the horizontal axis, the maximum value of the radar horizontal effective range as the maximum value of the horizontal axis, altitude as the vertical axis, and the maximum value of the cruising flight altitude as the maximum value of the vertical axis, and display the target track in real time in the vertical plane rectangular coordinate system according to altitude and distance.

[0007] Full track display: The track of general radar only saves and displays 5 to 15 points. The present invention saves and displays the complete track of each target currently existing in real time within the radar monitoring range.

[0008] Full track overlay: All targets that appear within a specified time period are displayed in a full track manner in the vertical coordinate system to form a vertical coverage map.

[0009] Furthermore, in the target playback interface of the radar, the target track data within a specified time is selected and the vertical coverage map is played back and displayed in an optional manner to avoid the influence of the vertical coverage map on the normal display of the radar target.

[0010] Screenshot comparison: The screenshot file name contains the date information of the playback track data, which is used for screenshot comparison at different periods.

[0011] Furthermore, by comparing the overhead blind spots and low-elevation angle detection blind spots of the vertical coverage maps generated by the track data of different periods, if there is no obvious change, it is determined that the radar's antenna lobe and system performance have not changed too much; if the inverted cone angle of the overhead blind spot increases, it is determined that the antenna lobe has changed, and the antenna needs to be tested and maintained; if the maximum distance corresponding to the low-elevation angle detection blind spot is comprehensively reduced, it is determined that the radar system performance has declined, and the radar's system indicators need to be tested and maintained.

[0012] The beneficial effects of the present invention are as follows: without adding any hardware, the display and screenshot of the radar vertical coverage map are added to the radar playback function, the target track is superimposed and displayed on the vertical plane, the vertical coverage of the radar is intuitively reflected, the vertical coverage maps corresponding to the track data of different dates are compared, and it is judged whether the radar's overhead blind area and low-elevation angle detection blind area have changed, which provides a basis for the change and maintenance of the radar performance, and also provides a basis for mutual blindness compensation in radar multiple coverage and the site selection of new radars. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the headspace blind area and the detection blind area. Figure 2 is the ideal secondary radar vertical lobe diagram, Figure 3 It is a real-time display of the entire vertical track. Figure 4 It is a vertical full track overlay display. DETAILED DESCRIPTION

[0014] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0015] The ideal secondary radar vertical lobe is as follows: Figure 2 As shown, the maximum value on the horizontal axis is 650 km, and the maximum value on the vertical axis is 80 km. The maximum value is based on the radar lobe diagram. The dotted lines are contour lines at intervals of 4 km, and the solid lines are the lobe diagrams.

[0016] Due to the influence of the earth's curvature, long-distance low-altitude targets are blocked by the earth's surface and fall below the horizon, forming a low-elevation-angle detection blind spot. Because the radar beam is shaped, an inverted cone-shaped overhead blind spot with an elevation angle between 45° and 50° is formed in the overhead space.

[0017] The vertical plane full track of the secondary radar is displayed in real time as follows Figure 3 As shown, the horizontal axis is limited to a maximum of 450km, and the vertical axis is limited to a maximum of 13km. The target's track is displayed in real time in the vertical coordinate system according to altitude and distance. That is, once a target appears and forms a track within the radar monitoring range, the target track will be retained and displayed, and the entire track generated by the monitored target will be displayed in the vertical plane coordinate system until the target disappears.

[0018] Since the number of monitored targets in the radar coverage airspace is limited, the real-time target track is difficult to reflect the vertical coverage of the radar in detail. The present invention adds a full track superposition display function, which superimposes and displays all targets appearing in a specified time period in the vertical plane coordinate system in the form of full tracks, such as Figure 4 As shown, the tracks of all targets generated within the selected time period are saved in the storage area for full track overlay display. Once the full overlay function is selected, the tracks saved in the storage area will all be displayed in the vertical plane coordinate system to form a vertical coverage map.

[0019] The radar track record is in days. A track record file is generated every 24 consecutive hours. A track data file containing year, month and day information is generated at zero o'clock. The track data of the specified date can be played back by selecting the file name.

[0020] In order to prevent the generation and display of the vertical overlay map from affecting the normal target display of the radar, the present invention designs the vertical overlay map under the target playback function of the radar. The playback operation time and the playback track data date are optional, which improves the flexibility of the use of the present invention. It can usually be performed when air transportation is not busy and the user has time.

[0021] In order to improve the comparability of vertical coverage maps and reduce the impact of external factors, the full track overlay uses 24 consecutive hours as the overlay time period, corresponding to the time period of a track record file, so that the duration and amount of track information corresponding to each generation of the vertical track overlay map are consistent, reducing the differences in vertical track overlay maps caused by different flight flows at different times of the day, different routes, and different altitude levels.

[0022] Select the track record file according to the date, select the vertical overlay display, set the playback speed, select the full track playback, or select the full track overlay to display all the track information generated within 24 consecutive hours on that date.

[0023] Save the vertical coverage map. The generated screenshot file name contains the date of the playback track data. Compare the vertical coverage maps of different periods to determine whether the elevation angle of the overhead blind area has increased and whether the low-elevation monitoring blind area has expanded. This can be used to determine whether the radar's lobe pattern characteristics have changed and whether the radar system performance has changed, which helps to monitor and maintain the performance of the radar antenna and radar system.

[0024] The above are embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A method for displaying a radar vertical coverage map, characterized in that: include: Display radar target track in vertical plane rectangular coordinate system: establish vertical plane rectangular coordinate system, with distance as horizontal axis, maximum value of radar horizontal range as horizontal axis maximum value, altitude as vertical axis, maximum value of cruising altitude as vertical axis maximum value, and display target track in real time in vertical plane rectangular coordinate system according to altitude and distance; Full track display: save and display the complete track of each target currently existing in real time within the radar monitoring range. In the target playback interface of the radar, select the target track data within the specified time and play back and display the vertical coverage map in an optional way to avoid the influence of the vertical coverage map on the normal display of the radar target; Full track overlay: all targets appearing within the specified time period are overlaid and displayed in the vertical plane coordinate system in the form of full tracks to form a vertical coverage map; Screenshot comparison: The screenshot file name contains the date information of the track data playback. Compare the vertical coverage map generated by the track data in the screenshots of different periods with the top air blind area and the low elevation angle monitoring blind area. If there is no obvious change, it is determined that the radar antenna lobe and system performance have not changed too much; if the inverted cone angle of the top air blind area increases, it is determined that the antenna lobe has changed, and the antenna needs to be tested and maintained; If the maximum distance corresponding to the low-elevation angle detection blind area is reduced overall, it is determined that the radar system performance has degraded and the radar system needs to be markedly tested and maintained.

2. The method for displaying a radar vertical coverage map according to claim 1, characterized in that: The full track display includes: the radar track is recorded in days, a track record file is generated every 24 consecutive hours, a track data file containing year, month and day information is generated at zero o'clock, and the track data of the specified date can be played back by selecting the file name.

3. The method for displaying a radar vertical coverage map according to claim 2, characterized in that: The full track superposition includes: taking 24 consecutive hours as the superposition time period, corresponding to the time period of a track record file, so that the time length corresponding to each generation of a vertical track superposition map is consistent and the track information volume is the same.

Images