To investigate the development trends and challenges of long-endurance unmanned aerial vehicle (UAV)

the research status of key technologies were analyzed and summarized. Long-endurance UAV has extensive application prospects because of its characteristics of high flight height

long operation time

and wide operation coverage. First

the representative long-endurance UAVs in the world were classified based on conventional power and new energy power

and the development history of long-endurance UAV was reviewed. Based on the demand of high lift

high lift-drag ratio

and moderate stall aerodynamic characteristics of long-endurance UAV

the large flexibility of high-aspect-ratio composite wing

and the complex mission environment of long-endurance UAV

the key technologies were analyzed

including high efficiency aerodynamic integrated design technology

aeroelastic analysis of high-aspect-ratio wing and active control technology

aeroelastic tailoring technology

flexible flight dynamics modeling and control technology

and autonomous navigation technology

etc. Finally

combined with the development situations of foreign long-endurance UAV

suggestions for the development of long-endurance UAV in China were put forward. Research shows that the conventional power long-endurance UAV has been widely used

while the new energy power long-endurance UAV is still in the prototype development stage. Technologies applied on the ultra-long-endurance UAV which has a duration of more than a week have become the focus of attention. The intelligence

collaboration

and network security of long-endurance UAV systems will be the main development directions in the future.