MH/T 2008-2017Fence of unmanned aircraft system (English PDF)

3.1 Terms and definitions

The terms defined in AC-91-FS-2015-31 and the following terms apply to this document.

3.1.1

In order to ensure the safety of the area, the area boundary shall be drawn in the corresponding geographic area with an electronic information model. In the UAV system or UAV cloud system in the system, the software and hardware systems that use electronic information models to prevent drones from flying in or out of specific areas.

3.1.2

Online authorization Before the drone takes off, the authorization of the drone is completed through data update, network authentication and other methods.

3.1.3

Location-Based Service Obtain the location information (geographical coordinates or geodetic coordinates) of mobile terminal users through the cellular radio communication network of the telecommunications mobile operator.

4.1 UAV fence model

The UAV fence model uses a 4-dimensional space structure. As shown in Figure 1, it includes.

4.2 Classification and configuration of drone fences

4.2.1 Classification of UAV fences

UAV fence configurations can be divided into the following three types according to their projection geometry on the horizontal plane.

--Restricted surface of civil airport obstacles;

--Sector shape;

--Polygon.

The longitude and latitude coordinate points used by the drone fence are all WGS-84 coordinates.

4.2.2 Typical configuration of obstacle restriction surface protection area of civil airport

The obstacle restriction surface of the civil airport is shown as the solid line in Figure 2, and the obstacle restriction surface protection area of the civil airport is shown as the dashed line in Figure 2.Civil airport barrier the obstacle limit surface protection zone is A1-A2-C2-arc C2B2-B2-B2-B3-arc B3C3-C3-A3-A4-C4-arc C4B4-B4-B1-arc B1C1-C1-A1 in Figure 2 the coordinates of each point and the arc connection range; the arc radius is 7 070 m. The solid line in Figure 2 is the vertical projection of the obstacle restriction surface of the civil airport.

The space between the dotted line and the solid line is the tolerance buffer zone, and the technical parameters of the buffer zone should meet the requirements announced by the air traffic control department.

Figure 2 Schematic diagram of the obstacle restriction surface protection area and boundary points of the civil airport

4.2.3 Space geometric configuration of polygonal drone fence

The spatial geometric configuration of the polygonal drone fence is composed of cubes composed of bottom and top surfaces at different altitudes. The schematic diagram is shown in Figure 3.

Show. A surface of the spatial geometric configuration is a closed space area composed of N space points on the same plane, and the space points start from true north.

Name them clockwise on the horizontal surface. The vertex sequence is clockwise. The number of vertices constituting the top surface and the bottom surface is equal.

4.2.4 Space geometric configuration of sector-shaped UAV fence

4.2.4.1 The spatial geometric configuration of the sector-shaped UAV fence is composed of a cube composed of sector-shaped bottom and top surfaces at different altitudes.

The schematic diagram is shown in Figure 4.The sector surface of a space consists of the sector origin, sector radius, and sector start and end azimuth (sector opening) on the same plane.

The real direction of the beginning and the real direction of the sector end) constitute a closed space area.

4.2.4.2 The origin of the sector is defined by the latitude and longitude of the geographic point.

4.2.4.3 The radius of the sector is centered at the origin of the sector, and the distance unit is meters.

4.2.4.4 The start and end direction of a sector is the true direction of the beginning and end of the sector.

4.2.4.5 The sector height is the relative height range that is prohibited from entering the area.

Note. m1~m5 are the vertex numbers of the top surface of the fence;

4.3 Effective time of drone fence

The time used by the drone fence is UTC time. The effective time of the drone fence refers to the prohibition of drones from flying in the space the time period (including the start time and end time), the effective time can be multiple time periods. Each drone fence has a valid time.

5.1 Data type

5.1.1 Basic data types

5.1.2 Data Types of Obstacle Restriction Area Protected Areas at Civil Airports

The typical configuration data type of the civil airport obstacle restriction surface protection area is represented by A, and its data structure is shown in Table 2.

5.1.3 Polygon data type description

The polygon data type is represented by P, and its data structure is shown in Table 3.

5.1.4 Sector data type description

The sector-shaped data type is represented by S, and its data structure is shown in Table 4.

5.1.5 Description of spatial geometric coordinate system

The spatial geometric coordinate system of the drone fence adopts the WGS-84 coordinate system, in which the unit of longitude and latitude are degrees; the north latitude is positive and the south latitude is negative;

The east longitude is positive and the west longitude is negative.

5.1.6 Description of valid time data type

The time system of the drone fence uses UTC time. The effective time of a drone fence object indicates that the drone is not in the space area.

The time domain allowed to fly. The data type is represented by T. A time domain is composed of start time and end time. A pair of drone fences the image valid time is composed of multiple time domains.

The data structure of the valid time (T) of the UAV fence object is shown in Table 5.

5.2 Data structure description of drone fence metadata

The UAV fence database is composed of the metadata of the UAV fences distributed all over the country, and the metadata data of the UAV fence objects the structure is shown in Table 6.

6.1 UAV system requirements

6.1.1 The UAV system should be equipped with the use of electronic information models to prevent the UAV from flying into or out of the UAV fence.

6.1.2 UAV systems should have different levels of safety capabilities to meet different UAV operational safety requirements. The drone system can press According to the functional and safety capabilities that meet the requirements of drone fences, they are classified from level 1 to level 6, with level 1 being the lowest, level 6 being the highest, level 5 and 6 Level reserved.

6.1.3 The safety capability level of the UAV system is shown in Table 7.

6.2 UAV cloud system requirements

The UAV cloud system should have the function of the UAV fence. When the UAV joining the cloud system approaches and invades the UAV fence, the UAV the cloud system should have functions such as triggering various prompts or warnings.

6.3 Trigger conditions for drone fence

When the drone conflicts with the drone fence, the drone system or the drone cloud system should trigger a prompt or warning, and the drone fence prompt the conditions for repeated triggering are shown in Table 8.

7.1 UAV system test

7.1.1 The test environment should meet the requirements for UAV system operation and communication in AC-91-FS-2015-31.

7.1.2 In the UAV system, check the data obtained in the UAV system to make sure that it meets the requirements of MH/T 2009, the display is correct, and the data the real-time update rate of the data meets the requirements of AC-91-FS-2015-31 regarding the update frequency in UAV operation management.

7.1.3 Use high-precision positioning devices and other equipment for positioning during UAV testing, and manipulate UAVs to approach or invade in various operating environments.

Enter the drone fence and observe whether the drone system triggers prompts, warnings and warnings.

7.1.4 In the UAV fence detection system, the flight test airspace is set to a UAV fence that is prohibited from flying into, according to the two indicators of time and distance.

Standard to test the UAV system.

7.2 UAV cloud system test

7.2.1 The test environment should meet the requirements for UAV cloud system operation and communication in AC-91-FS-2015-31.

7.2.2 The UAVs that have passed the test fly in the designated or temporarily designated airspace containing UAV fences, and approach the UAVs.

And when invading the UAV fence, observe whether the UAV cloud system triggers various prompts or warnings and other functions.