Autonomous unmanned aerial vehicle

An autonomous unmanned aerial vehicle comprising:

• an engine assembly, wherein the engine assembly is located in a body, and the engine assembly provides motion to a front propeller and a rear propeller,
• the front propeller, wherein the front propeller is located in a front of the body, wherein the front of the body is connected to the engine assembly,
• the rear propeller, wherein the rear propeller is connected to the engine assembly and the rear propeller is located at a rear of the body, the rear propeller is configured to rotate in a same direction or opposite direction to the front propeller,
• 3 wings, wherein the 3 wings enable vertical take-off and vertical landing of the autonomous unmanned aerial vehicle, a plurality of sharp ends of the 3 wings are used as a landing gear, and the landing gear are installed on the body with constant 120 degree spacing,
• a liquid hydrogen tank installed in a center of the rear propeller,
• a balloon is wrapped around the liquid hydrogen tank, wherein the balloon is inflated with hydrogen in the liquid hydrogen tank, and the balloon enables suspension of the autonomous unmanned aerial vehicle in air,
• a multispectral camera, wherein the multispectral camera is installed in a center of the front propeller, and
• a stabilized platform, wherein the stabilized platform carries the multispectral camera.