One. The GB/T 38909-2020 standard specifies the electromagnetic compatibility requirements and test methods for civilian light and small unmanned aerial vehicle systems (including aircraft and ground stations). It is suitable for the design, manufacturing and testing of (takeoff weight between 0.25kg and 150kg). Other types of UAV systems can also be implemented with reference.

Two.     Launch and immunity test items specified for UAV systems:

Three. Radiated emission limit requirements (refer to GB/T6113.203 for test methods):

b If it meets one or more of the requirements of serial number 1, serial number 2 or serial number 4, serial number 5 in the table, the product meets the requirements below 1GHz.

c The measurement distance is 3m or 10m, of which the 3m measurement distance is only used for small UAVs whose entire machine (including cables) can operate in a cylindrical measurement area with a diameter of 1.2m and a height of 1.5m above the ground plane.

d can be measured at 3m, the limit value increases by 10dB.

e can be measured at a greater distance, and the limit is reduced by 20dB for every 10 times the distance.

3.1 Maximum test frequency for radiated emissions

Four. Radiated emission limit requirements (refer to GB/T6113.201 for test methods):

Five. Performance judgment of immunity

The immunity test results should be classified according to the degree of function loss or performance degradation of UAV products. The degree of degradation is divided into four levels: A, B, C, and D.

Loss of functionality and reduced performance of drone products include:

a) Signal transmission is interrupted or lost;

b) The aircraft does not respond to control signals or the control performance is reduced;

c) Image transmission is interrupted or phenomena such as lag, mosaic, snowflakes, streaks, ghosting, etc. appear;

d) The task equipment does not respond to control signals or the control performance such as rotation and shooting is reduced;

e) Loss of other functions or reduction in performance.

The four classification standards for drone product function loss or performance degradation are A, B, C, and D:

 ——Level A: All functions and performance are normal;

——Level B: The phenomena listed in a) and b) do not occur; any phenomenon in c), d) and e) occurs, and it can recover automatically within 2 minutes (inclusive) after the interference stops, without operator intervention;

——Level C: The phenomena listed in a) and b) do not occur; any of the phenomena in c), d) and e) occur, and the interference still cannot recover by itself for 2 minutes after the interference stops, until the operator resets or restarts it Recoverable after operation;

——Level D: Any phenomenon listed in a) and b) occurs; or the phenomenon listed in a) and b) does not occur, but any phenomenon listed in c), d) and e) occurs, and due to hardware or software damage, data It cannot be restored due to loss or other reasons.

5.1 Power frequency magnetic field immunity (test methods and requirements are in accordance with GB/T 17626.8)

 Test conditions:

5.2 Radiated immunity (test methods and requirements are in accordance with GB/T 17626.3)

Test conditions

5.3 Electrostatic discharge immunity (test methods and requirements are in accordance with GB/T 17626.2)

Test conditions:

5.4 Conducted immunity (test methods and requirements are in accordance with GB/T 17626.6)

Test conditions:

 5.5 Electrical fast transient pulse group immunity (test methods and requirements are in accordance with GB/T 17626.4)

 Test conditions:

5.6 Surge (impact) immunity (test methods and requirements are in accordance with GB/T 17626.5)

Test conditions:

5.7 Voltage sag and short-term interruption immunity (test methods and requirements are in accordance with GB/T 17626.11)

Test conditions: