首页|Differential pressure difference based altitude control of a stratospheric satellite
Differential pressure difference based altitude control of a stratospheric satellite
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An autonomous altitude adjustment system for a stratospheric satellite(StratoSat)platform is proposed.This platform consists of a helium balloon,a ballonet,and a two-way blower.The helium balloon generates lift to balance the platform gravity.The two-way blower inflates and deflates the ballonet to regulate the buoyancy.Altitude adjustment is achieved by tracking the differential pres-sure difference(DPD),and a threshold switching strategy is used to achieve blower flow control.The vertical acceleration regulation ability is decided not only by the blower flow rate,but also by the designed margin of pressure difference(MPD).Pressure difference is a slow-varying variable compared with altitude,and it is adopted as the control variable.The response speed of the actuator to disturbance can be delayed,and the overshoot caused by the large inertia of the platform is inhibi-ted.This method can maintain a high tracking accuracy and reduce the complexity of model calcula-tion,thus improving the robustness of controller design.
stratospheric satellite(StratoSat)differential pressure difference(DPD)alti-tude adjustmentthreshold switching strategymargin of pressure difference(MPD)
CHEN Li(陈丽)、WANG Xiaoliang
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Flight College,Shanghai University of Engineering Science,Shanghai 201620,P.R.China
School of Aeronautics and Astronautics,Shanghai Jiao Tong University,Shanghai 200240,P.R.China
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