Moving-mass-based station keeping of stratospheric airships

Abstract

Stratospheric airships are lighter-than-air vehicles that work at an altitude of 20km in the lower calm portion of the stratosphere. They can be used as real-time surveillance platforms for environment monitoring and civil communication. Solar energy is the ideal power choice for long-endurance stratospheric airships. Attitude control is important for airships so that they can point at a target for observation or adjust the attitude to improve the output performance of solar panels. Stratospheric airships have a large volume and semi-flexible structure. The typical actuators used are aerodynamic surfaces, vectored thrust and ballonets. However, not all these actuators can work well under special working conditions, such as low density and low speed. In this study, moving-mass control is introduced to stratospheric airships because its control efficiency is independent of airspeed and atmospheric density. A nonlinear feedback controller based on generalised inverse with a nonlinear mapping module is designed to implement moving-mass control. Such a new station keeping scheme with moving masses is proposed for airships with different working situations.

Finite-time velocity-free trajectory tracking control for a stratospheric airship with preassigned accuracy

“…Recently, the stratosphere has received considerable attention from the modern aviation and aerospace industry that endeavors to exploit its stable atmospheric conditions [1][2][3]. This dramatically accelerates the development of the long-dwell stratospheric airship [4], which is a typical lighter-than-air aircraft that plays various roles from telecommunication to space-like observation outpost, similar to satellites [5][6][7][8]. To accomplish diverse mission objectives, driving the airship to reach and follow a time parameterised reference route, also termed as trajectory tracking control, is the most fundamental flight control task [9][10][11].…”