Figure 1.
(a) Schematic diagram for the whole process of the balloon-borne SP-UAV. (b) Balloon-lifting and level-flying process of the SP-UAV in near-space.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.