Landing guidance radar global display method based on range compression

Abstract

The invention discloses a landing guidance radar global display method based on range compression. The method mainly solves the problem that an existing radar cannot observe a global target in a non-global range. According to the implementation scheme, a measuring range switching control is arranged, and the measuring range of a double-B type display interface comprising a glide display area and a course display area is switched; drawing a distance identification line, a pitch angle identification line, a glide line and a contour line in the glide display area; drawing a distance identification line, a course angle identification line and a course line in the course display area; carrying out compression processing on the identification lines exceeding the measuring range in the two display areas; drawing a target at a corresponding position of the picture according to the position information of target measurement and the current range picture; and the points of the drawn identification lines are all displayed on the double-B type display interface. According to the invention, on the basis of range compression-based global picture display, a user can conveniently observe a close-range target while global picture monitoring is considered, the target position monitoring range under a small range is enlarged, and the method can be used for a display terminal of a landing guide radar.

Description

Technical Field

[0001] The invention belongs to the field of radar terminal display, and in particular relates to a landing guidance radar full-area display method, which can be used for a landing guidance radar display system. Background Art

[0002] In recent years, due to the rapid development of microelectronics technology and various electronic devices, the various sub-units and system architecture of radar have been continuously updated. The digitization of radar has been rapidly promoted, and combined with the computer front end, it has facilitated the visualization of aircraft position and heading, providing more convenient conditions for the construction of landing guidance radar system, and improving the efficiency and operability of the system.

[0003] The existing landing guidance radar terminal screen usually adopts double B display. The radar display resolution is 1280*1024, and the display area is 1000×1000 pixels. The upper part is the glide path display area, and the pixel range is: the horizontal axis 1~1000 displays the range of 0~40km at a range of 40km, and the range of 0~20km at a range of 20km. The vertical axis 1~455 displays the pitch angle range of -1°~9°; the lower part is the heading display area, and the pixel range is: the horizontal axis 1~1000 displays the range of 0~40km at a range of 40km, and the range of 0~20km at a range of 20km. The vertical axis 545~1000 displays the azimuth angle range of -20°~20°. The radar can switch between displaying the 40km and 20km range images. When the 20km range image is displayed, the glide path and heading horizontal coordinates display the distance within 0 to 20km in 0 to 1000 pixels. Although this method can meet the user's needs for clearly observing close-range targets, it cannot monitor and display targets beyond 20km. Summary of the invention

[0004] The purpose of the present invention is to address the shortcomings of the above-mentioned display method and propose a global display method based on range compression display to solve the problem that the target cannot be fully monitored and displayed under existing conditions, making it easier for users to use.

[0005] To achieve the above purpose, the technology of the present invention comprises the following steps:

[0006] (1) The landing guidance radar display screen is divided into two parts, namely the glide path display area and the heading display area. By setting the range switching control, the screen can be switched to any screen under the range of 40 km, 20 km and 10 km;

[0007] (2) Draw distance marking lines and pitch angle marking lines in the downward slide display area to form a grid display diagram;

[0008] (3) Draw contour lines in the sliding display area;

[0009] (4) Draw a downward slope using the known starting point and inflection point;

[0010] (5) In the sliding display area, the portion of each identification line that exceeds the currently selected range is compressed;

[0011] (6) Draw distance marking lines and heading angle marking lines in the heading display area to form a grid display diagram;

[0012] (7) Draw a heading line in the heading display area;

[0013] (8) In the heading display area, the portion exceeding the currently selected range is compressed;

[0014] (9) Based on the location information of the target measurement and the currently selected range, the target is displayed at the corresponding position on the screen.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] Firstly, the present invention adopts a method of displaying the entire area based on range compression, which solves the problem that the existing display screen cannot monitor the target 20km away after switching to the 20km range;

[0017] Secondly, a 10km range screen display has been added, which allows users to observe close-range targets while taking into account the full-area screen, making it easier for users to use.

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a flow chart for realizing the present invention;

[0020] Figure 2 It is a schematic diagram of a global display screen based on range compression in the present invention; DETAILED DESCRIPTION

[0021] Reference Figure 1 , the implementation steps of the present invention are as follows:

[0022] Step 1: Switch the range of the dual-B display interface including the glide path display area and the heading display area.

[0023] The B-scope, whose full name is range-azimuth display, adopts a two-dimensional rectangular coordinate system display mode, displays the azimuth of the target in the horizontal direction and displays the distance of the target in the vertical direction.

[0024] The dual-B display interface is a display interface formed by connecting the range-azimuth sliding display area and the range-heading display area up and down according to the distance on the horizontal axis. The calculation formula and display method of the horizontal coordinates of the sliding and heading display areas are the same, so they can be spliced ​​up and down to expand the field of view. The steps for switching the range of the dual-B display interface are as follows:

[0025] (1.1) Set a button control on the double B display interface. The button is a control in the Qt Creator development software and is called the "Range Switch" drop-down menu control.

[0026] (1.2) When the operator clicks the "range switch" button, he can freely choose any range of 10km, 20km, and 40km;

[0027] (1.3) According to the selected range, the computer redisplays the blank glide display area and heading display area corresponding to the selected range.

[0028] Step 2: Draw the distance marking line, pitch angle marking line, and heading angle marking line in the glide path and heading display area.

[0029] The distance marking lines include the distance marking lines on the sliding screen and the distance marking lines on the heading screen. They are usually multiple vertical lines arranged at fixed intervals, which divide the entire display area into blocks of the same size. They are the marking lines of the horizontal coordinates of the entire display area. Each point on the distance marking line has the same horizontal coordinate, so it is helpful for the user to judge the horizontal coordinate of the target point.

[0030] The pitch angle marking line and the heading angle marking line are usually multiple horizontal lines arranged at fixed intervals, which are used to divide the entire display area into blocks of the same size. The pitch angle marking line is the marking line of the vertical coordinate of the sliding display area, and the heading angle marking line is the marking line of the vertical coordinate of the heading display area. The points on the two marking lines have the same vertical coordinate, so it is helpful for users to judge the vertical coordinate of the target point.

[0031] The drawing of the distance marking line, the pitch angle marking line, and the heading angle marking line is performed according to the range selected in step 1, and the implementation steps are as follows:

[0032] (2.1) Under the 40km range, the distance marking lines of the glide screen and the heading screen are drawn with each pixel representing a distance of 40m. Both include 2.5km and 5km compound scale distance marking lines. The coordinate position of the glide screen distance marking line on the display screen is: [(1,1), (1, 455)], [(40000 / 40 / 16*l,1), (40000 / 40 / 16*l,455)], l=1, 2…16; the coordinate position of the heading screen distance marking line on the display screen is: [(1,545), (1, 1000)], [(40000 / 40 / 16*l,545), (40000 / 40 / 16*l,1000)];

[0033] (2.2) At a range of 20 km, this includes processing of the 0-20 km image and the 20-40 km image:

[0034] For the 0-20km screen, the distance marking lines of the glide screen and the heading screen are drawn according to each pixel representing a distance of 25m. Both include 1km and 5km compound scale distance marking lines. The coordinate position of the glide screen distance marking line on the display screen is: [(1,1), (1, 455)], [(20000 / 25 / 20*n, 1), (20000 / 25 / 20*n, 455)], n = 1, 2…20; the coordinate position of the heading screen distance marking line on the display screen is: [(1, 545), (1, 1000)], [(20000 / 25 / 20*n, 545), (20000 / 25 / 20*n, 1000)];

[0035] For the 20km~40km image compression processing, the distance marking lines of the glide screen and the heading screen are drawn according to each pixel representing a distance of 100m. Both use 5km single-scale distance marking lines. The coordinate position of the glide screen distance marking line on the display screen is: [(800+20000 / 100 / 4*j,1), (800+20000 / 100 / 4*j,455)], j=1,2,3,4; the coordinate position of the heading screen distance marking line on the display screen is: [(800+20000 / 100 / 4*j,545), (800+20000 / 100 / 4*j,1000)];

[0036] (2.3) Under the 10km range, including the processing of the 0-10km screen and the 10km-40km screen:

[0037] For the 0-10km screen, the distance marking lines of the glide screen and the heading screen are drawn according to the distance of 100 / 7m represented by each pixel point. Both include 500m and 1km compound scale distance marking lines. The coordinate positions of the glide screen distance marking lines on the display screen are: [(1,1), (1, 455)], [(35*n, 1), (35*n, 455)]; the coordinate positions of the heading screen distance marking lines on the display screen are: [(1,545), (1, 1000)], [(35*n, 545), (35*n, 1000)];

[0038] For the 10km~40km image compression processing, the distance marking lines of the glide screen and the heading screen are drawn according to each pixel representing a distance of 100m. Both use 5km single-scale distance marking lines. The position of the glide screen distance marking line on the display screen is: [(700+30000 / 100 / 7*m,1), (700+30000 / 100 / 7*m,455)], m=1,2,3…7; the coordinate position of the heading screen distance marking line on the display screen is: [(700+30000 / 100 / 4*j,545), (700+30000 / 100 / 4*j,1000)];

[0039] (2.4) For the same pitch angle identification line corresponding to all ranges, its coordinate position on the display screen is: [(1,1), (1000, 1)], [(1, (9-k) * 455 / 10), (1000, (9-k) * 455 / 10)], k = -1, 0, 3, 6.

[0040] (2.5) For the same heading angle identification line corresponding to all ranges, its coordinate position on the display screen is: [(1,546), (1000, 546)], [(1,545+(20-b)*455 / 40), (1000, 545+(20-b)*455 / 40], b = -20, -15, -10…15.

[0041] Step 3: Draw contour lines in the downward display area.

[0042] The contour lines are mapped on the display interface by points of the same height in reality, and are used as a reference for users to determine the position of the aircraft.

[0043] The contour lines are drawn according to the range selected in step 1, and the implementation steps are as follows:

[0044] (3.1) Calculate the glide angle α1 of any point G on the contour line:

[0045]

[0046] Where: H is the height represented by the contour line;

[0047] h is the installation height, i.e. the vertical height between the radar antenna and the horizontal plane of the runway;

[0048] r is the horizontal distance from the point on the contour line to the end of the runway, ranging from 0 to 40 km;

[0049] R is the setback distance, i.e. the distance from the radar to the end of the runway;

[0050] (3.2) Convert the known distance r of G in space into the horizontal coordinate x of the display coordinate system, and compress the part that exceeds the range:

[0051] When the 40km range is selected:

[0052] When the 20km range is selected:

[0053] When the 10km range is selected:

[0054] (3.3) The sliding angle α1 of G in space is converted into the ordinate θ1 of the display coordinate system:

[0055]

[0056] (3.4) Determine the coordinates of point G in the display coordinate system (x, θ1);

[0057] (3.5) According to the steps (3.1) to (3.4), all points with a height of H in space are mapped to the display coordinate system, and then these points are connected to form a contour line with a height of H in the sliding display area. A maximum of 6 contour lines can be drawn in each coordinate system;

[0058] (3.6) Mark the height represented by one end of the contour line.

[0059] Step 4: Draw a downward line in the downward display area.

[0060] The glide path is a reference trajectory for setting the glide path of the aircraft when landing. The glide path uses the known starting point Q1 and six inflection points Q i , 2≤i≤7, which contains distance information and height information. The distance information is the horizontal distance between the point and the end of the airport runway, and the height information is the vertical distance between the point and the horizontal plane where the airport runway is located.

[0061] The drawing of the downward slope is performed according to the range selected in step 1, and the implementation steps are as follows:

[0062] (4.1) Connect the starting point and the inflection point in sequence to obtain six broken lines;

[0063] (4.2) Calculate the i-th fold line Q i Q i+1 The angle between any point B on the radar and the horizontal line of the radar antenna, that is, the glide path angle α2 of point B:

[0064]

[0065] Where: r is the horizontal distance from a point on the i-th broken line in space to the end of the airport runway, ranging from 0 to 40 km;

[0066] r i Q is the starting point of the i-th broken line in space i Horizontal distance to the end of the airport runway;

[0067] h i+1 is the end point Q of the i-th broken line in space i+1 High information;

[0068] h i Q is the starting point of the i-th broken line in space i Highly informative;

[0069] r i+1 is the end point Q of the i-th broken line in space i Horizontal distance to the end of the airport runway;

[0070] h is the vertical height between the radar antenna and the horizontal plane where the airport runway is located;

[0071] R is the distance from the radar to the end of the airport runway;

[0072] (4.3) Map the distance r of B in space to the display coordinate system, and compress the part that exceeds the range:

[0073] When the range is 40km:

[0074] When the range is 20km:

[0075] When the range is 10km:

[0076] (4.4) The sliding angle α2 of B in space is converted into the ordinate θ2 of the display coordinate system:

[0077]

[0078] (4.5) Get the position of point B on the sliding display interface (x, θ2);

[0079] (4.6) Repeat steps (4.2) to (4.5) to obtain the positions of all points, and then connect the obtained points to obtain the downward sliding line.

[0080] Step 5: Draw a heading line in the heading display area.

[0081] The heading line is a reference track for the heading flight of the aircraft when landing. The extended line of the airport runway starting from the end of the airport runway is mapped in the heading display area as a standard heading line.

[0082] The drawing of the heading line is performed according to the range selected in step 1, and the implementation steps are as follows:

[0083] (5.1) Establish a line on the horizontal plane where the airport runway is located, with the starting point being the end of the airport runway and the end point being the extended line of the airport runway 40 km away from the end of the airport runway, i.e. the heading line;

[0084] (5.2) Calculate the angle between the radar antenna horizontal line and any point P on the heading line, that is, the heading angle λ of point P:

[0085]

[0086] Where: r is the horizontal distance from point P to the end of the airport runway in space, ranging from 0 to 40 km;

[0087] R is the distance from the radar to the end of the runway;

[0088] D is the horizontal distance from the radar to the runway;

[0089] (5.3) The distance r of point P in space is converted into the horizontal coordinate x of the display coordinate system, and the part exceeding the range is compressed:

[0090] When the range is 40km:

[0091] When the range is 20km:

[0092] When the range is 10km:

[0093] (5.4) The heading angle λ in the space of point P is converted into the ordinate θ3 of the display coordinate system:

[0094]

[0095] (5.5) According to the horizontal coordinate x in (5.3) and the vertical coordinate θ3 in (5.4), the coordinates (x, θ3) of point P in the heading display area interface are obtained;

[0096] (5.6) Repeat steps (5.2) to (5.5), calculate the coordinates of all points on the standard heading track line in space and connect them to form a heading line.

[0097] Step 6: Draw the target location.

[0098] The target position is drawn according to the distance r, pitch angle g and azimuth angle h of the target measured by the radar in the radar coordinate system, combined with the range selected in step 1, and the implementation steps are as follows:

[0099] (6.1) Calculate the x-coordinate of the target in the glide zone and heading zone, and compress the part that exceeds the range:

[0100] When the range is 40km:

[0101] When the range is 20km:

[0102] When the range is 10km:

[0103] (6.2) Calculate the target's ordinate position y in the glide path:

[0104]

[0105] (6.3) Calculate the target's ordinate position z in the heading area:

[0106]

[0107] (6.4) Based on the calculation results of steps (6.1) to (6.3), draw the target points at the glide zone position (x, y) and the heading zone position (x, z).

[0108] Step 7: Full screen display.

[0109] (7.1) Display the distance marking lines, pitch angle marking lines, and heading angle marking lines drawn in the glide path and heading display area in step 2 on the dual-B display interface;

[0110] (7.2) The contour lines drawn in the downward slide display area in step 3, the downward slide lines drawn in the downward slide display area in step 4, and the heading lines drawn in the heading display area in step 5 are all displayed on the dual B display interface, as shown in the figure below. Figure 2 As shown, Figure 2 (a) is the full screen display at a range of 40 km. Figure 2 (b) is the full screen display at a range of 20 km. Figure 2(c) is the full screen display at a range of 10 km. The upper part of each picture is the downlink display area, where the green vertical line is the distance mark line, the green horizontal line is the pitch angle mark line, the white line is the downlink line, and the blue line is the contour line; the lower part is the heading display area, where the green vertical line is the distance mark line, the green horizontal line is the heading angle mark line, and the white line is the heading line;

[0111] (7.3) Display all the target points drawn in the glide path and heading display area in step 6 on the dual-B display interface to complete the full-area display of the landing guidance radar.

[0112] This example uses the dual-B display interface of the landing guidance radar. Its main function is to display multiple auxiliary lines and target points in the glide area and heading area, and to monitor global targets under different range screens.

[0113] The above description is only a specific example of the present invention and does not constitute any limitation to the present invention. It is obvious that for professionals in this field, after understanding the content and principles of the present invention, they may make various modifications and changes in form and details without departing from the principles and structures of the present invention. However, these modifications and changes based on the ideas of the present invention are still within the scope of protection of the claims of the present invention.

[0114] It should be noted that the step numbers in the specification and claims of the present invention are only for a clear description of the implementation scheme of the present invention to facilitate understanding, and the order of the step numbers is not limited.

Claims

1. A landing guidance radar full-range display method based on range compression, characterized in that: The steps include: (1) The landing guidance radar display screen is divided into two parts, namely the glide path display area and the heading display area. By setting the range switching control, the screen can be switched to any screen under the range of 40 km, 20 km and 10 km; (2) Draw distance marking lines and pitch angle marking lines in the downward slide display area to form a grid display diagram; (3) Draw contour lines in the sliding display area; (4) Draw a downward slope using the known starting point and inflection point; (5) In the sliding display area, the portion of each identification line that exceeds the currently selected range is compressed; (6) Draw distance marking lines and heading angle marking lines in the heading display area to form a grid display diagram; (7) Draw a heading line in the heading display area; (8) In the heading display area, the portion exceeding the currently selected range is compressed; (9) Based on the location information of the target measurement and the currently selected range, the target is displayed at the corresponding position on the screen.

2. The method according to claim 1, characterized in that In step (2), the distance marking lines and the pitch angle marking lines are drawn in the downward display area to form a grid display diagram. The corresponding distance marking lines are drawn for the distance value represented by each pixel according to the following rules based on the range selected in step 1: (2a) In the 40 km range screen, distance marking lines are drawn with each pixel representing a distance of 40 m. The distance marking lines include 2.5 km and 5 km compound scale distance marking lines. Their coordinate positions in the display screen are: [(1,1), (1, 455)], [(40000 / 40 / 16*l,1), (40000 / 40 / 16*l,455)], l = 1, 2…16; (2b) In the 20km range screen, for the 0-20km section, 1km and 5km compound scale distance marking lines are drawn with each pixel representing a distance of 25m. Their coordinate positions in the display screen are: [(1,1), (1, 455)], [(20000 / 25 / 20*n, 1), (20000 / 25 / 20*n, 455)], n = 1, 2…20; for the 20km-40km section, the 5km single scale distance marking lines are drawn with each pixel representing a distance of 100m. Their coordinate positions in the display screen are: [(800+20000 / 100 / 4*j, 1), (800+20000 / 100 / 4*j, 455)], j = 1, 2, 3, 4; (2c) Under the 10km range, for the 0-10km screen, 500m and 1km compound scale distance marking lines are drawn according to each pixel representing a distance of 100 / 7m, and their coordinate positions on the display screen are: [(1,1), (1, 455)], [(35*n, 1), (35*n, 455)]; for the 10km-40km screen, the 5km single scale distance marking line is drawn according to each pixel representing a distance of 100m, and its coordinate positions on the display screen are: [(700+30000 / 100 / 7*m, 1), (700+30000 / 100 / 7*m, 455)], m = 1, 2, 3…7; (2d) For the same pitch angle identification line corresponding to all ranges, its coordinate position on the display screen is: [(1,1), (1000, 1)], [(1, (9-k) * 455 / 10), (1000, (9-k) * 455 / 10)], k = -1, 0, 3, 6.

3. The method according to claim 1, characterized in that In step (3), contour lines are drawn in the sliding display area, and corresponding identification lines are drawn according to the range selected in step 1. The implementation steps include the following: (3a) Calculate the glide angle α1 of any point G on the contour line: Where: H is the height represented by the contour line; h is the installation height, i.e. the vertical height between the radar antenna and the horizontal plane of the runway; r is the horizontal distance from the point on the contour line to the end of the runway, ranging from 0 to 40 km; R is the setback distance, i.e. the distance from the radar to the end of the runway; (3b) Convert the known distance r of G in space into the horizontal coordinate x of the display coordinate system, and compress the part that exceeds the range: When the 40km range is selected: When the 20km range is selected: When the 10km range is selected: (3c) Convert the glide angle α1 of G in space into the ordinate θ1 of the display coordinate system: (3d) Determine the coordinates (x, θ1) of point G in the display coordinate system; (3e) According to the above steps, all points with a height of H in space are mapped to the display coordinate system, and then these points are connected to obtain a contour line with a height of H in the downward sliding display area. A maximum of 6 contour lines can be drawn in each coordinate system; (3f) Mark one end of the contour line with the height H it represents.

4. The method according to claim 1, characterized in that Step (4) uses the known starting point and inflection points to draw the downward slope, which is based on the range selected in step 1, using a known starting point Q1 and six inflection points Q i , 2≤i≤7, and draw each point. Each point contains distance information and height information. The distance information is the horizontal distance between the point and the end of the airport runway, and the height information is the vertical distance between the point and the horizontal plane where the airport runway is located. The implementation steps include the following: (4a) Connect the starting point and the inflection point in sequence to obtain six broken lines; (4b) Calculate the i-th fold line Q i Q i+1 The angle between any point B on the radar and the horizontal line of the radar antenna, that is, the glide path angle α2 of point B: Where: r is the horizontal distance from a point on the i-th broken line in space to the end of the airport runway, ranging from 0 to 40 km; r i Q is the starting point of the i-th broken line in space i Horizontal distance to the end of the airport runway, ranging from 0 to 40 km; h i+1 is the end point Q of the i-th broken line in space i+1 High information; h i Q is the starting point of the i-th broken line in space i High information; r i+1 is the end point Q of the i-th broken line in space i Horizontal distance to the end of the airport runway, ranging from 0 to 40 km; h is the vertical height between the radar antenna and the horizontal plane where the airport runway is located; R is the distance from the radar to the end of the airport runway; (4c) Map the distance r of B in space to the display coordinate system and compress the part that exceeds the range: When the range is 40km: When the range is 20km: When the range is 10km: (4d) Convert the sliding angle α2 of B in space into the ordinate θ2 of the display coordinate system: (4e) Get the position of point B on the sliding display interface (x, θ2); (4f) Repeat steps (4b) to (4e) to obtain the positions of all broken line points, and then connect the obtained points to obtain the downward sliding line.

5. The method according to claim 1, characterized in that In step (5), in the sliding display area, the portion of each identification line that exceeds the currently selected range is compressed, that is, in the 20km range, each identification line in the 20km to 40km portion of the sliding display area is compressed and drawn; At a range of 10 km, the marking lines in the 10 km to 40 km portion of the downward sliding display area are compressed and drawn.

6. The method according to claim 1, characterized in that In step (6), the distance marking line and the heading angle marking line are drawn in the heading display area to form a grid display diagram. The corresponding marking lines are drawn according to the range selected in step 1. The implementation steps include the following: (6a) At a range of 40 km, distance marking lines are drawn with each pixel representing a distance of 40 m. The distance marking lines are 2.5 km and 5 km double-scale distance marking lines, and their coordinate positions on the display screen are: [(1,545), (1, 1000)], [(40000 / 40 / 16*1,545), (40000 / 40 / 16*1,1000)]; (6b) Under the 20km range, for the 0-20km screen, 1km and 5km compound scale distance marking lines are drawn with each pixel representing a distance of 25m. The coordinate positions of the marking lines on the display screen are: [(1,545),(1,1000)], [(20000 / 25 / 20*n,545), (20000 / 25 / 20*n,1000)]; for the 10km-40km screen, the 5km single scale distance marking lines are drawn with each pixel representing a distance of 100m. The coordinate positions of the marking lines on the display screen are: [(800+20000 / 100 / 4*j,545), (800+20000 / 100 / 4*j,1000)]; (6c) Under the 10km range, for the 0-10km screen, 500m and 1km compound scale distance marking lines are drawn according to each pixel representing a distance of 100 / 7m, and their coordinate positions on the display screen are: [(1,545), (1, 1000)], [(35*n, 545), (35*n, 1000)]; for the 10km-40km screen, the 5km single scale distance marking line is drawn according to each pixel representing a distance of 100m, and its coordinate positions on the display screen are: [(700+30000 / 100 / 4*m, 545), (700+30000 / 100 / 4*m, 1000)]; (6d) For the same heading angle identification line corresponding to all ranges, its coordinate position on the display screen is: [(1,546), (1000, 546)], [(1,545+(20-b)*455 / 40), (1000, 545+(20-b)*455 / 40], b = -20, -15, -10…15.

7. The method according to claim 1, characterized in that In step (7), the heading line is drawn in the heading display area by drawing the corresponding identification line according to the range selected in step 1. The implementation steps include the following: (7a) Establish a line on the horizontal plane where the airport runway is located, with the starting point being the end of the airport runway and the end point being the extended line of the airport runway 40 km away from the end of the airport runway, i.e. the heading line; (7b) Calculate the angle between the radar antenna horizontal line and any point P on the heading line, that is, the heading angle λ of point P: Where: r is the horizontal distance from point P to the end of the airport runway in space, ranging from 0 to 40 km; R is the distance from the radar to the end of the runway; D is the horizontal distance from the radar to the runway; (7c) Mapping the heading line in space to the heading display area interface: (7c1) The distance r of point P in space is transformed into the horizontal coordinate x of the display coordinate system, and the part exceeding the range is compressed: When the range is 40km: When the range is 20km: When the range is 10km: (7c2) Convert the heading angle λ in the space of point P into the ordinate θ3 of the display coordinate system: (7c3) According to the horizontal coordinate x in (7c1) and the vertical coordinate θ3 in (7c2), the position (x, θ3) of point P in the heading display area interface is obtained; (7d) Repeat steps (7b) to (7c), calculate the coordinates of all points on the track line in space and connect them to form a heading line.

8. The method according to claim 1, characterized in that In step (8), in the heading display area, the portion exceeding the currently selected range is compressed, and under the 20km range, each marking line in the 20km to 40km portion of the heading display area is compressed and drawn; At a range of 10 km, the marking lines in the 10 km to 40 km portion of the heading display area are compressed and drawn.

9. The method according to claim 1, characterized in that: In step (9), the target is displayed at the corresponding position of the screen according to the position information of the target measurement and the currently selected range. The corresponding drawing is performed according to the range selected in step 1. The implementation steps include the following: (9a) Calculate the target's horizontal coordinate x in the glide zone and heading zone: When the range is 40km: When the range is 20km: When the range is 10km: Where r is the distance of the target in the radar coordinate system; (9b) Calculate the target's ordinate position y in the glide path: Where g is the pitch angle of the target in the radar coordinate system; (9c) Calculate the target's ordinate position z in the heading area: Where h is the pitch angle of the target in the radar coordinate system; (9d) According to the calculation results of steps (9a) to (9c), target points are drawn at the glide zone position (x, y) and the heading zone position (x, z).

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