Trajectory Control Method For Stratospheric Airship In Wind Field

Stratospheric airship is currently a hot research field in near space,which can extend periods of time at an altitude around 20 km.And it has the advantages that wide range of coverage and high use cost-effective.It also has broad application prospects in the field of information acquisition and information countermeasure.Trajectory control is the key technology of stratospheric airship development and application.This paper focuses on the trajectory high-accuracy control of stratospheric airship,carries out deep and systematic research,and achieved a series of research results.Six degrees of freedom model of stratospheric airship is established,and its motion characteristics are analyzed.Six degrees of freedom model of the stratospheric airship were established by Newton-Euler method and Lagrange method.The linear model is derived from the nonlinear dynamic model under the “small perturbation” assumption,and stability of the airship is analyzed by means of Lyapunov stability theorem.Trajectory control method of stratospheric airships based on the sliding mode is developed.Aiming at the characteristics of stratospheric airship that affected by wind field and the uncertainty of model.A trajectory control method of stratospheric Airship based on sliding mode is proposed.In order to improve the control accuracy of track and the quality of the controller,trajectory control method of stratospheric airship based on sliding mode control and prediction is proposed.It improves the control accuracy of the initial stage,and reduces the time into the sliding surface.A trajectory control method of stratospheric airship based on model prediction is developed.Aiming at the characteristics of stratospheric airships such as large inertia and long delay of control,a trajectory control method of stratospheric airship based on model prediction is proposed.This method solves the control law online,realizes the real-time optimization of the controller,and solves the problems of the stratospheric airship model uncertainty and the serious lag of the control.A nonlinear trajectory control method of stratospheric airship based on back-stepping method is studied.In order to solve the failure problem of linear model,a nonlinear trajectory control method of stratospheric airship based on back-stepping method is proposed.This control method improves the quality of stratospheric airship trajectory controller,realized the high accuracy nonlinear control of stratospheric airship trajectory.The altitude control method of stratospheric airship is studied.An altitude control program is proposed based on propulsion vector and tilting mechanism.According to the program,altitude control method of the stratospheric airship based on PID and model prediction,solve the rapid climbing,descent,hovering and high drift problems of stratospheric airship.In this paper,the mathematical model of stratospheric airship is enriched and perfected,and the theory of stratospheric airship trajectory control is developed,which has a certain theoretical significance.Trajectory control method of stratospheric airship research provides theoretical basis for solving the controlled flight problem of stratospheric airship.The research in the paper also provides support for stratospheric airship control system design,and provides some fruitful reference for altitude control method of stratospheric airship.