Research on fixed-point aerostat based on its special stratosphere wind field

In order to achieve the position control, the stratospheric airship requires a large amount of energy consumption. Starting from the trajectory control idea of stratospheric satellites of U.S. Global Aerospace Company, We propose a new fixed-point deployment scheme for stratospheric aerostat based on the special wind field characteristics of bottom stratospheric quasi-zero wind layer. Through the statistical analysis of the operating wind field environment, the overall system structure and working principles are given: tuning the trajectory controller to realize the attitude adjustment of floating balloon, using the reverse characteristics of the up/down zone of quasi-zero wind layer to achieve east-west direction control; utilizing trajectory controller to generate the control force, dragging the balloon via tether to achieve north-south direction control. Dynamics model of the floating balloon and trajectory controller is built, and the tether is modeled by means of "lumped mass-lightweight rigid rod". In addition, the overall scheme of the control system is designed for further verification. Simulation results indicate that: the floating balloon, implemented through utilizing the special wind field characteristics of the bottom stratosphere, has the capability of fixed-point residence and maneuver flight within certain area.