The flying speed of the plant protection unmanned helicopter is 2 mu/s, the width of the spraying device is 3-4 meters, the working width is 4-8 meters, the distance from the plant can be kept at the lowest fixed height 1-2 meters, and the scale operation can reach 80- 100 mu per hour, and its efficiency is at least 100 times higher than that of conventional spraying. The automatic flight control and navigation operation of agricultural unmanned helicopter minimizes the time for workers to contact pesticides, thus ensuring the safety of workers!

2. Flight control and navigation work independently.

The application of unmanned helicopter spraying technology is not limited by terrain and height. As long as the unmanned helicopter takes off in the field and operates crops within the flying height of the unmanned helicopter, the unmanned helicopter adopts remote control operation and flight control navigation autonomous operation functions. Just before the spraying operation, the GPS information of crops in farmland is collected, the route is planned and input into the internal control system of the ground station. The ground station gives instructions to the aircraft, which can carry the spraying device and fly back automatically after the spraying operation is completed. While the aircraft is spraying, the progress of spraying can be observed in real time through the display interface of the ground station. (UAV automatic navigation is a flight control navigation system for agricultural aircraft based on GPS technology and embedded system technology, which can realize automatic boundary planning, automatic channel planning, farmland area calculation and real-time flight trajectory. )

3, the coverage density is high, and the control effect is good.

The higher the coverage density of spraying liquid medicine per unit area, the more uniform it is, and the better the control effect is. The experiment of liquid medicine droplet drift shows the advantages of unmanned helicopter spraying in pesticide drift degree. Unmanned helicopter is a spiral wing, and its working height is relatively low. When the liquid medicine droplets are sprayed from the sprayer, they are accelerated by the downward airflow of the rotor to form an aerosol flow, which directly increases the penetration of the liquid medicine droplets to crops and reduces the drift degree of pesticides. Moreover, the deposition amount and coverage rate of the liquid medicine are better than the conventional ones, so the control effect is better than the traditional one, and the soil pollution caused by pesticides can also be prevented.

4, the cost of saving water and medicine is low.

The unmanned helicopter spraying technology can save at least 50% pesticide consumption and 90% water consumption by spraying, which will greatly reduce the resource cost. Unmanned helicopter has low depreciation rate, low fuel consumption, low labor cost per unit operation and convenient maintenance.