A method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS

Abstract

The present invention discloses a method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS, and belongs to the technical field of civil aviation radar equipment. The method of the present invention comprises the following steps: step 1, calculating the vertical shielding angle of each obstacle relative to the station, and screening out the obstacle set with a vertical shielding angle greater than 0.25°; step 2, merging obstacles with overlapping shielding relative to the station to obtain a set of mutually non-shielding obstacles; step 3, in the above-mentioned mutually non-shielding obstacle set, judging whether the cumulative horizontal shielding angle of the obstacle within any 15° interval of the radar station exceeds 1.5° or whether the cumulative horizontal shielding angle of the obstacle within any 45° range of the radar station exceeds 3.0°, so as to judge whether the above-mentioned mutually non-shielding obstacle set meets the station shielding restriction requirements. The method of the present invention can improve the audit efficiency of the auditor, reduce the audit pressure, and ensure the safe operation of the radar station.

Description

Technical Field

[0001] The invention belongs to the technical field of civil aviation radar equipment, and in particular relates to a cumulative horizontal shielding angle analysis method of civil aviation radar equipment combined with GIS. Background Art

[0002] Protection of the electromagnetic environment around air traffic control communication, navigation and surveillance equipment is the key basis for ensuring air traffic control operations and affects flight safety and operational efficiency.

[0003] Air traffic control surveillance radar can measure and display aircraft position and distance information within the effective coverage range, and monitor the operation of aircraft in the terminal and approach control airspace. Its detection range is limited by factors such as line of sight, transmission power, and terrain and objects. The reflection and shielding of radio signals by terrain and objects will directly affect the radar's airspace coverage capability. Therefore, in MH / T4003.2 "Civil Aviation Communication Navigation Surveillance Station (Station) Installation Site Specification Part 2: Surveillance", clear requirements are put forward for the shielding restrictions of radar station site protection areas, that is, the vertical shielding angle and horizontal shielding angle of a single (or dense) obstacle relative to the station are not allowed to exceed the allowable range at the same time.

[0004] Since the radar station site protection zone covers a wide area, the shielding restrictions are abstract, and the cumulative impact needs to be considered, it is very difficult for the auditor to determine whether the obstacles meet the shielding restriction requirements of the radar site protection zone. Currently, manual calculations are inefficient and prone to calculation errors. With the increasing number of obstacles in the protection zone, the calculation of the cumulative horizontal angle of the radar site protection zone shielding restriction is becoming increasingly difficult. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS, so as to at least solve some of the above technical problems.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] The present invention discloses a method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS, which is characterized by comprising the following steps:

[0008] Step 1: Calculate the vertical shielding angle of each obstacle relative to the station, and select the set of obstacles with vertical shielding angle greater than 0.25° ;

[0009] Step 2: Merge obstacle sets O 0, there are overlapping obstacles relative to the station to obtain a set of obstacles that do not block each other ;

[0010] Step 3: In the above-mentioned set of non-blocking obstacles, determine whether the cumulative horizontal shielding angle of obstacles within any 15° interval of the radar station exceeds 1.5° or whether the cumulative horizontal shielding angle of obstacles within any 45° range of the radar station exceeds 3.0°.

[0011] If the cumulative horizontal shielding angle of obstacles within any 15° interval of the radar station exceeds 1.5° or the cumulative horizontal shielding angle of obstacles within any 45° interval of the radar station exceeds 3.0°, it is determined that the above-mentioned non-shielding obstacle set does not meet the station shielding restriction requirements.

[0012] If the cumulative horizontal shielding angle of obstacles within any 15° interval of the radar station does not exceed 1.5° and the cumulative horizontal shielding angle of obstacles within any 45° interval of the radar station does not exceed 3.0°, it is determined that the above-mentioned set of non-shielding obstacles meets the station shielding restriction requirements.

[0013] In some embodiments of the present invention, in step 1, the vertical shielding angle of each obstacle relative to the station is calculated using the following formula: :

[0014] ;

[0015] in, B i is the obstacle altitude, in meters; H R is the terrain height of the station coordinate point, in meters; H T The station antenna height in meters; D i is the distance between the obstacle and the station, in kilometers, D i The maximum value is 30km.

[0016] In some embodiments of the present invention, in step 2, the obstacle set selected in step 1 is first determined. O 0 whether there is mutual occlusion between the obstacles; if there is mutual occlusion, the mutually occluding obstacles are merged into one obstacle, and then the merged obstacles and the obstacles that do not block the obstacles in the judgment process are combined to form a set of obstacles that do not block each other. .

[0017] In some implementation schemes of the present invention, when determining whether there is mutual obstruction between obstacles, the starting and ending azimuths of the obstacles relative to the station are respectively i 水平start and i 水平end , then the two obstacles O A , OB Determine whether there is occlusion between them using the following method:

[0018] Relationship 1, such as i 水平Aend < i 水平Bstart ,or i 水平Astart > i 水平Bend , then the obstacle O A and obstacles O B There is no occlusion;

[0019] Relation 2, such as i 水平Astart < i 水平Bstart ,and i 水平Aend > i 水平Bstart ,and i 水平Aend < i 水平Bend , then the obstacle O A and obstacles O B There is partial occlusion;

[0020] Relation 3, such as i 水平Astart < i 水平Bstart ,and i 水平Aend > i 水平Bend , then the obstacle O A and obstacles O B Completely overlapping occlusion;

[0021] in i 水平Astart , i 水平Aend Respectively represent obstacles O A The starting and ending azimuths relative to the station,

[0022] i 水平Bstart , i 水平Bend Respectively represent obstacles O B The starting and ending azimuths relative to the station.

[0023] In some embodiments of the present invention, the obstacle in relation 2O A and obstacles O B There are partial occlusions, which need to be merged into one obstacle, and the merged obstacle i 合并水平start = i 水平Astart , i 合并水平end = i 水平Bend ;

[0024] Obstacles in Relation 3 O A and obstacles O B There are overlapping occlusions, which need to be merged into one obstacle, and the merged obstacle i 合并水平start = i 水平Astart , i 合并水平end = i 水平Aend ;

[0025] in i 合并水平start、 i 合并水平end They respectively represent the starting and ending azimuths of the merged obstacle relative to the station.

[0026] In some embodiments of the present invention, in step 3, the calculation The coverage angle of the obstacle relative to the station i 夹角 and the cumulative horizontal shielding angle relative to the station i 累计水平 ,

[0027] (1) If i 夹角 <15° and i 累计水平 >1.5°, then the obstacles do not block each other. Does not meet the station shielding restriction requirements; if i 夹角 <15° and i 累计水平 ≤1.5°, then the obstacles do not block each other. Meet the station shielding restriction requirements;

[0028] (2) If i 夹角 ≥15°, and the cumulative horizontal shielding angle of obstacles within any 15° interval of the radar station i 累计水平>1.5°, then the obstacles do not block each other. Failure to meet station shadowing restriction requirements;

[0029] (3) If i 夹角 ≥15°, and the cumulative horizontal shielding angle of obstacles within any 15° interval of the radar station i 累计水平 <1.5°, then it is judged that the cumulative horizontal shielding angle of obstacles within any 45° interval of the radar station i 累计水平 Whether it exceeds 3.0°; if it exceeds 3.0°, the obstacles do not block each other. Does not meet the station shielding limit requirements. If it does not exceed 3.0°, the obstacle set does not shield each other. Meet the station shielding restriction requirements.

[0030] In some embodiments of the present invention, the coverage angle i 夹角 The calculation formula is as follows:

[0031] i 夹角 =θ 水平iend - i 水平1start ;

[0032] in, i 水平iend A collection of obstacles that do not block each other Middle i The end azimuth of the obstacle relative to the station, i 水平1start A collection of obstacles that do not block each other The starting azimuth of the first obstacle relative to the station.

[0033] In some embodiments of the present invention, the cumulative horizontal shielding angle i 累计水平 The calculation formula is as follows:

[0034] i 累计水平 =∑ i 水平i ,

[0035] in i 水平i A collection of obstacles that do not block each other Middle i The horizontal shielding angle of an obstacle relative to the station is calculated as follows:

[0036] i 水平i = i 水平iend - i 水平istart ;

[0037] in, i 水平istart 、the 水平iend are sets of obstacles that do not block each other Middle i The starting and ending azimuths of the obstacle relative to the station.

[0038] In some embodiments of the present invention, the cumulative horizontal shielding angle of obstacles in any interval is determined. i 累计水平 Whether it exceeds the target degree, you need to In each obstacle O i The starting azimuth i 水平istart As the starting azimuth of the interval i 区间start , with the above starting azimuth i 水平istart Add 15° or 45° as the end azimuth of the interval i 区间end , and the following calculation formula is used to calculate the cumulative horizontal shielding angle θ of the obstacle within the azimuth interval 累计水平 Perform the calculation:

[0039] ；

[0040] Among them, when the arbitrary interval of the radar station is a 15° interval, the value of "15or45" in the formula is 15; when the arbitrary interval of the radar station is a 45° interval, the value of "15or45" in the formula is 45;

[0041] i 水平1end A collection of obstacles that do not block each other The ending azimuth of the first obstacle relative to the station;

[0042] i 水平i A collection of obstacles that do not block each other Middle i The horizontal shielding angle of an obstacle relative to the station.

[0043] In some embodiments of the present invention, if the obstacle O i of i 水平iend < i 区间end ,but

[0044] ;

[0045] If obstacles O i of i 水平istart < i 区间end ,and i 水平iend ≥ i 区间end ,but

[0046] , and within this range i 区间start The cumulative horizontal shielding angle of the obstacle interval at the starting angle i 累计水平 Addition completed;

[0047] If obstacles O i of i 水平istart ≥ i 区间end , then within this interval, the obstacle does not participate in the calculation of the cumulative shielding angle. i 区间start The cumulative horizontal shielding angle of the obstacle interval at the starting angle i 累计水平 Addition completed;

[0048] When the calculation occurs i 累计水平 >1.5° or i 累计水平 >3°, it is determined that the obstacle set does not block each other. The station shielding limit requirement is not met if the calculation does not appear until the last obstacle i 累计水平 >1.5° or i 累计水平 >3°, it is determined that the obstacle set does not block each other. Meet the station shielding restriction requirements.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The method of the present invention can quickly determine whether multiple obstacles meet the requirements of radar standards, improve the audit efficiency of the auditor, reduce the audit pressure, and ensure the safe operation of the radar station. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a side view schematic diagram of the relationship between the obstacle and the station position;

[0052] Figure 2 This is a top-down diagram of the relationship between obstacles and station locations;

[0053] Figure 3 is the relationship diagram between station and obstacle coordinates;

[0054] Figure 4 Schematic diagram of the starting and ending azimuths of the obstacle relative to the station;

[0055] Figure 5 This is a schematic diagram of obstacles blocking each other;

[0056] Figure 6 This is a schematic diagram of partial occlusion by an obstacle;

[0057] Figure 7 This is a schematic diagram of complete overlap of obstacles;

[0058] Figure 8 Schematic diagram of the coverage angle of obstacles relative to the station;

[0059] Figure 9 The coverage angle of obstacles relative to the station within the 15° interval is shown in Figure 2. Figure one ;

[0060] Figure 10 The coverage angle of obstacles relative to the station within the 15° interval is shown in Figure 2. Figure 2 ;

[0061] Figure 11 A building coordinate diagram according to Embodiment 1 of the present invention;

[0062] Figure 12 This is the obstacle map after screening in Example 1 of the present invention. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0064] like Figure 1-Figure 10 As shown, the method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS provided by the present invention comprises the following steps:

[0065] Step 1: Calculate the vertical shielding angle of each obstacle relative to the station, and select the set of obstacles with vertical shielding angle greater than 0.25° ;

[0066] The vertical shielding angle of each obstacle relative to the station The calculation formula is as follows:

[0067] ;

[0068] Among them, B i is the obstacle altitude, in meters; H R is the terrain height of the station coordinate point, in meters; H T Station antenna height, in meters; D i is the distance between the obstacle and the station, in kilometers, D i The maximum value is 30km.

[0069] As attached Figure 1 and 2 As shown, the known obstacle set , obstacle altitude Meters, longitude and latitude of obstacle coordinates ( ), the station coordinates are located at a high elevation H R , station antenna height H T , longitude and latitude of the station coordinates ( ), the station antenna is at a high altitude T for:

[0070] T = H R +H T

[0071] By calculating geographic information, the station coordinates can be obtained ( ) and the coordinate points adjacent to the obstacle ( )and The shortest distance between the composed line segments and the azimuth of the coordinate point and i 水平start and i 水平end , as attached Figure 3 and attached Figure 4 shown.

[0072] from Figure 3 It can be seen that the shortest distance D between the obstacle and the station is the minimum value of the line segment composed of every two coordinate points from the station coordinates, that is:

[0073]

[0074] The vertical shielding angle of each obstacle relative to the station is i 垂直i for:

[0075]

[0076] Step 2: Merge obstacle sets O 0, there are overlapping obstacles relative to the station to obtain a set of obstacles that do not block each other ; The details are as follows:

[0077] First determine the obstacle set selected in step 1 O 0 whether there is mutual occlusion between the obstacles; if there is mutual occlusion, the mutually occluding obstacles are merged into one obstacle, and then the merged obstacles and the obstacles that do not block the obstacles in the judgment process are combined to form a set of obstacles that do not block each other. .

[0078] When judging whether there is mutual obstruction between obstacles, the starting and ending azimuths of the obstacles relative to the station are i 水平start and i 水平end , as attached Figure 5 As shown, obstacles O A and obstacles O B The following method is used to determine whether there is occlusion between them:

[0079] Relationship 1, such as i 水平Aend < i 水平Bstart ,or i 水平Astart > i 水平Bend , then the obstacle O A and obstacles O B There is no occlusion;

[0080] Relation 2, such as i 水平Astart < i 水平Bstart ,and i 水平Aend > i 水平Bstart ,and i 水平Aend < i 水平Bend , then the obstacle O A and obstacles O B There is partial occlusion;

[0081] Relation 3, such as i水平Astart < i 水平Bstart ,and i 水平Aend > i 水平Bend , then the obstacle O A and obstacles O B Completely overlapping occlusion;

[0082] in i 水平Astart , i 水平Aend Respectively represent obstacles O A The starting and ending azimuths relative to the station,

[0083] i 水平Bstart , i 水平Bend Respectively represent obstacles O B The starting and ending azimuths relative to the station.

[0084] Obstacles in Relation 2 O A and obstacles O B There is partial occlusion, such as Figure 6 As shown, they need to be merged into one obstacle, and the merged obstacle i 水平start = i 水平Astart , i 水平end = i 水平Bend ;

[0085] Obstacles in Relation 3 O A and obstacles O B There is overlapping occlusion, such as Figure 7 As shown, they need to be merged into one obstacle, and the merged obstacle i 水平start = i 水平Astart , i 水平end = i 水平Aend .

[0086] Step 3: In the above set of non-blocking obstacles, determine the cumulative horizontal blocking angle of obstacles within any 15° interval of the radar station. i 累计水平Whether it exceeds 1.5° or whether the cumulative horizontal shielding angle of obstacles within any 45° interval of the radar station exceeds 3.0°.

[0087] According to the standard (MH / T 4003.1-2014, Civil Aviation Communication Navigation Monitoring Station (Station) Installation Site Specification Part 2: Monitoring), within any 15° azimuth range of the radar station, the horizontal shielding angle of a single (or dense) obstacle (vertical shielding angle exceeds the limit) is allowed to be no more than 1.5°; within any 45° azimuth range of the radar station, the horizontal shielding angle of a single (or dense) obstacle (vertical shielding angle exceeds the limit) is allowed to be no more than 3.0°. In i 水平istart Sorting from small to large, we can get The coverage angle of the obstacle relative to the station i 夹角 ,like Figure 8 As shown;

[0088] i 夹角 The calculation formula is as follows: i 夹角 =θ 水平iend - i 水平1start ;

[0089] in, i 水平iend A collection of obstacles that do not block each other Middle i Obstacles O i The end azimuth relative to the station, i 水平1start A collection of obstacles that do not block each other The first obstacle O 1The starting azimuth relative to the station.

[0090] A collection of obstacles that do not block each other Cumulative horizontal shielding angle relative to the station i 累计水平 =∑ i 水平i , i 水平i for Middle i Obstacles O i The horizontal shielding angle relative to the station is calculated as follows:

[0091] i 水平i = i水平iend - i 水平istart ;

[0092] in, i 水平istart 、the 水平iend A collection of obstacles that do not block each other Middle i Obstacles O i The starting and ending azimuths relative to the station.

[0093] (1) If i 夹角 <15° and i 累计水平 >1.5°, then the obstacles do not block each other. Does not meet the station shielding restriction requirements; if i 夹角 <15° and i 累计水平 ≤1.5°, then the obstacles do not block each other. Meet the station shielding restriction requirements.

[0094] (2) If i 夹角 ≥15°, and the cumulative horizontal shielding angle of obstacles within any 15° interval i 累计水平 >1.5°, then the obstacles do not block each other. The station shielding restriction requirements are not met.

[0095] (3) If i 夹角 ≥15°, and the cumulative horizontal shielding angle of obstacles within any 15° interval i 累计水平 <1.5°, then the cumulative horizontal shielding angle of obstacles within any 45° interval is determined i 累计水平 Whether it exceeds 3.0°; if it exceeds 3.0°, the obstacles do not block each other. Does not meet the station shielding limit requirements. If it does not exceed 3.0°, the obstacle set does not shield each other. Meet the station shielding restriction requirements.

[0096] like Figure 9 and Figure 10 As shown, the cumulative horizontal shielding angle of obstacles in any interval is determined i 累计水平 If the target degree is exceeded, The starting azimuth of each obstacle i 水平istartAs the starting azimuth of the interval i 区间start , with the above starting azimuth i 水平istart Add 15° or 45° as the end azimuth of the interval i 区间end , and the cumulative horizontal shielding angle of the obstacle is calculated using the following calculation formula within the azimuth interval. The calculation formula is as follows:

[0097] ；

[0098] When the arbitrary interval is a 15° interval, the value of "15or45" in the formula is 15; when the arbitrary interval is a 45° interval, the value of "15or45" in the formula is 45;

[0099] (1) If obstacles O i of i 水平iend < i 区间end , then its horizontal shielding angle i 水平i Calculate as follows:

[0100] ;

[0101] i 水平istart 、the 水平iend A collection of obstacles that do not block each other Middle i Obstacles O i The starting and ending azimuths relative to the station.

[0102] (2) If obstacles O i of i 水平istart < i 区间end ,and i 水平iend ≥ i 区间end , then its horizontal shielding angle i 水平i Calculate as follows:

[0103] ,

[0104] And within this range i 区间start The cumulative horizontal shielding angle of the obstacle interval at the starting angle i 累计水平 Addition completed;

[0105] (3) If obstacles O i of i 水平istart ≥ i 区间end , then within this interval, the obstacle does not participate in the calculation of the cumulative shielding angle. i 区间start The cumulative horizontal shielding angle of the obstacle interval at the starting angle i 累计水平 Addition completed;

[0106] When the calculation occurs i 累计水平 >1.5° or i 累计水平 >3°, it is determined that the obstacle set does not block each other. Does not meet the station shielding limit requirements; if the calculation does not appear until the last obstacle i 累计水平 >1.5° or i 累计水平 >3°, it is determined that the obstacle set does not block each other. Meet the station shielding restriction requirements.

[0107] Example 1

[0108] There are 24 buildings ,like Figure 11 As shown. The longitude and latitude and altitude of each building coordinate point are known.

[0109] The altitudes of the 24 buildings are 516.6, 468, 462, 468, 462, 479, 503.5, 518, 471, 487, 458, 458, 498.75, 498.9, 498.9, 498.75, 481.65, 481.65, 481.5, 481.65, 481.5, 492.9, 492.9, 492.75 meters, respectively. H R , station antenna height H T , longitude and latitude of the station coordinates ( ).

[0110] 1. Calculate the closest distance between each building and the station D 1~24={5520.02, 5566.79, 5499.62, 5583.22, 5515.58, 5600.53, 5510.36, 5482.58, 5419.14, 5352.44, 5419.40, 5350.70, 5590.84, 5517.85, 5443.49, 5371.49, 5601.91, 5507.87, 5429.94, 5593.30, 5459.83, 5660.40, 5614.87, 5492.09} (m),

[0111] Calculate the vertical shielding angle between each building and the station i 垂直1~24 ={0.49, -0.02, -0.08, -0.02, -0.08, 0.09, 0.35, 0.50, 0.01, 0.19, -0.12, -0.13, 0.30, 0.30, 0.31, 0.31, 0.12, 0.12, 0.12, 0.12, 0.23, 0.24, 0.24,} (°);

[0112] filter i 垂直i Obstacle set > 0.25° There are 7 buildings in total, such as Figure 12 shown.

[0113] 2. i 水平start and i 水平end We make a judgment and merge the buildings that overlap with the station. The azimuths of the seven buildings relative to the station are:

[0114] i 水平1start =256.592°, i 水平1end =257.1033°;

[0115] i 水平2start =256.9556°, i 水平2end =257.4562°;

[0116] i 水平3start =257.2933°, i 水平3end =257.8°;

[0117] i 水平4start =257.5683°, i 水平4end =257.9319°;

[0118] i 水平5start =267.4513°, i 水平5end =267.6926°;

[0119] i 水平6start =269.4584°, i 水平6end =269.9538°;

[0120] i 水平7start =271.4758°, i 水平7end =272.0663°.

[0121] Buildings 1 to 4 are partially blocked, so they are merged to obtain a set of obstacles that do not block each other. .

[0122] 3. Determine the set of obstacles that do not block each other middle,

[0123] i 夹角 =θ 水平iend - i 水平1start =272.0663°- 256.592°=15.4743° ≥15°

[0124] Therefore, As the starting building, judge within the 15° interval from 256.592° to 271.592°

[0125] i 累计水平 =257.9319°-256.592°+267.6926°-267.4513°

[0126] +269.9538°-269.4584°+272.0663°-271.4758°=2.6671°;

[0127] i 累计水平 >1.5°;

[0128] therefore The station shielding restriction requirements are not met. This method can quickly determine whether multiple obstacles meet the radar standard requirements, which can improve the audit efficiency of the auditor, reduce the audit pressure, and ensure the safe operation of the radar station.

[0129] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, but not to limit it, and certainly not to limit the patent scope of the present invention. Any changes or modifications that are made to the main design concept and spirit of the present invention without any substantial meaning, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention; in addition, the direct or indirect application of the technical solution of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. A method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS, characterized in that: The following steps are involved: Step 1: Calculate the vertical shielding angle of each obstacle relative to the station, and select the set of obstacles with vertical shielding angle greater than 0.25° ; Step 2: Merge obstacle sets O 0, there are overlapping obstacles relative to the station to obtain a set of obstacles that do not block each other ; Step 3: In the above-mentioned set of non-blocking obstacles, determine whether the cumulative horizontal shielding angle of obstacles in any 15° interval of the radar station exceeds 1.5° or whether the cumulative horizontal shielding angle of obstacles in any 45° interval of the radar station exceeds 3.0°; If the cumulative horizontal shielding angle of obstacles within any 15° interval of the radar station exceeds 1.5° or the cumulative horizontal shielding angle of obstacles within any 45° interval of the radar station exceeds 3.0°, it is determined that the above-mentioned mutually non-shielding obstacle set does not meet the station shielding restriction requirements; If the cumulative horizontal shielding angle of obstacles within any 15° interval of the radar station does not exceed 1.5° and the cumulative horizontal shielding angle of obstacles within any 45° interval of the radar station does not exceed 3.0°, it is determined that the above-mentioned set of non-shielding obstacles meets the station shielding restriction requirements.

2. The method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS according to claim 1 is characterized in that: In step 1, the vertical shielding angle of each obstacle relative to the station is calculated using the following formula: : ； in, B i is the obstacle altitude, in meters; H R is the terrain height of the station coordinate point, in meters; H T The station antenna height in meters; D i is the distance between the obstacle and the station, in kilometers, D i The maximum value is 30km.

3. The method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS according to claim 1 is characterized in that: In step 2, first determine the obstacle set selected in step 1 O 0. Whether there is mutual occlusion between obstacles; If there is mutual occlusion, the mutually occluding obstacles are merged into one obstacle, and then the merged obstacle and the obstacles that do not block the obstacles in the judgment process are combined to form a set of obstacles that do not block each other. .

4. The method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS according to claim 3 is characterized in that: When judging whether there is mutual obstruction between obstacles, the starting and ending azimuths of the obstacles relative to the station are θ 水平start and θ 水平end , then the two obstacles O A and O B Determine whether there is occlusion between them using the following method: Relationship 1, such as θ 水平Aend < θ 水平Bstart ,or θ 水平Astart > θ 水平Bend , then the obstacle O A and obstacles O B There is no occlusion; Relation 2, such as θ 水平Astart < θ 水平Bstart ,and θ 水平Aend > θ 水平Bstart ,and θ 水平Aend < θ 水平Bend , then the obstacle O A and obstacles O B There is partial occlusion; Relation 3, such as θ 水平Astart < θ 水平Bstart ,and θ 水平Aend > θ 水平Bend , then the obstacle O A and obstacles O B Completely overlapping occlusion; in θ 水平Astart , θ 水平Aend Respectively represent obstacles O A The starting and ending azimuths relative to the station, θ 水平Bstart , θ 水平Bend Respectively represent obstacles O B The starting and ending azimuths relative to the station.

5. The method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS according to claim 4 is characterized in that: Obstacles in Relation 2 O A and obstacles O B There are partial occlusions, which need to be merged into one obstacle, and the merged obstacle θ 合并水平start = θ 水平Astart , θ 合并水平end = θ 水平Bend ; Obstacles in Relation 3 O A and obstacles O B There are overlapping occlusions, which need to be merged into one obstacle, and the merged obstacle θ 合并水平start = θ 水平Astart , θ 合并水平end = θ 水平Aend ； in θ 合并水平start、 θ 合并水平end They respectively represent the starting and ending azimuths of the merged obstacle relative to the station.

6. The method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS according to claim 1 is characterized in that: In step 3, calculate The coverage angle of the obstacle relative to the station θ 夹角 and the cumulative horizontal shielding angle relative to the station θ 累计水平 , (1) If θ 夹角 <15° and θ 累计水平 >1.5°, then the obstacles do not block each other. Does not meet the station shielding restriction requirements; if θ 夹角 <15° and θ 累计水平 ≤1.5°, then the obstacles do not block each other. Meet the station shielding restriction requirements; (2) If θ 夹角 ≥15°, and the cumulative horizontal shielding angle of obstacles within any 15° interval of the radar station θ 累计水平 >1.5°, then the obstacles do not block each other. Failure to meet station shadowing restriction requirements; (3) If θ 夹角 ≥15°, and the cumulative horizontal shielding angle of obstacles within any 15° interval of the radar station θ 累计水平 <1.5°, then it is judged that the cumulative horizontal shielding angle of obstacles within any 45° interval of the radar station θ 累计水平 Whether it exceeds 3.0°; if it exceeds 3.0°, the obstacles do not block each other. Does not meet the station shielding limit requirements. If it does not exceed 3.0°, the obstacle set does not shield each other. Meet the station shielding restriction requirements.

7. The method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS according to claim 6 is characterized in that: Coverage Angle θ 夹角 The calculation formula is as follows: θ 夹角 =θ 水平iend - θ 水平1start ； in, θ 水平iend A collection of obstacles that do not block each other Middle i The end azimuth of the obstacle relative to the station, θ 水平1start A collection of obstacles that do not block each other The starting azimuth of the first obstacle relative to the station.

8. The method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS according to claim 7 is characterized in that: Determine the cumulative horizontal shielding angle of obstacles in any interval θ 累计水平 Exceeding the target degree ， Need to be in a mutually non-blocking obstacle set In each obstacle O i The starting azimuth θ 水平istart As the starting azimuth of the interval θ 区间start , with the above starting azimuth θ 水平istart Add 15° or 45° as the end azimuth of the interval θ 区间end , and the following calculation formula is used to calculate the cumulative horizontal shielding angle of obstacles within the azimuth interval: θ 累计水平 Perform the calculation: ； Among them, when the arbitrary interval of the radar station is a 15° interval, the value of 15or45 in the formula is 15; when the arbitrary interval of the radar station is a 45° interval, the value of 15or45 in the formula is 45; θ 水平1end A collection of obstacles that do not block each other The ending azimuth of the first obstacle relative to the station; θ 水平i A collection of obstacles that do not block each other Middle i The horizontal shielding angle of an obstacle relative to the station is calculated as follows: θ 水平i = θ 水平iend - θ 水平istart ； in, θ 水平istart ,θ 水平iend are sets of obstacles that do not block each other Middle i The starting and ending azimuths of the obstacle relative to the station.

9. The method for analyzing the cumulative horizontal shielding angle of civil aviation radar equipment combined with GIS according to claim 8 is characterized in that: If obstacles O i of θ 水平iend < θ 区间end ,but ； If obstacles O i of θ 水平istart < θ 区间end ,and θ 水平iend ≥ θ 区间end ,but , and within this range θ 区间start The cumulative horizontal shielding angle of the obstacle interval at the starting angle θ 累计水平 Addition completed; If obstacles O i of θ 水平istart ≥ θ 区间end , then within this interval, the obstacle does not participate in the calculation of the cumulative shielding angle. θ 区间start The cumulative horizontal shielding angle of the obstacle interval at the starting angle θ 累计水平 Addition completed; When the calculation occurs θ 累计水平 >1.5° or θ 累计水平 >3°, it is determined that the obstacle set does not block each other. The station shielding limit requirement is not met if the calculation does not appear until the last obstacle θ 累计水平 >1.5° or θ 累计水平 >3°, it is determined that the obstacle set does not block each other. Meet the station shielding restriction requirements.

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