Dynamic Modeling and Experimental Verification of the Pointing Technology in Balloon-Borne Telescope System for Optical Remote Sensing of Planets

Abstract

are carrying out the project of Venus observation with high precision using a balloon-borne telescope. In this paper, the outline of Balloon-Borne Telescope for the optical remote sensing of Venus is introduced, and the simulation model of three-stage control method is constructed. For this observation, the pointing technology with high precision to restrain the slight moving of image is necessary. The target precision is only 0.1 arc seconds. The dynamics and control model is defined firstly, and the model parameters are determined by the experimental verification. By developing the numerical simulation tool, the motion can be estimated in the simulator, and the control strategy can be more easily optimized compared to the gain adjustment only based on experiments.

Modeling and stability of balloon-borne gondolas with coupled pendulum-torsion dynamics

“…The azimuth pointing control of balloon-borne gondolas is most often designed solely with a model of the torsion of the flight train [7][8][9][10][11][12][13][14][15]. However, in presence of a coupling between the gondola's azimuth and the pendulum oscillations of the system, the azimuth control can excite and even destabilize the pendulum modes.…”

“…Two types of dynamics are generally distinguished in the modeling of balloon systems. About the vertical axis, the torsion of the flight chain is traditionally modeled as a mass-spring system [7][8][9][10][11][12][13][14][15]. Although the stiffness is generally experimentally determined by system identification, which requires to deploy the whole system and process in-flight data, the bifilar pendulum model allows to analytically derive the stiffness of balloon flight chains [16,17].…”

Modeling of stratospheric balloons and robust line-of-sight pointing control

“…The earliest dynamical models of stratospheric balloonborne systems are found in 1975 in a technical report from NASA [10] motivated by the attitude determination for the LACATE experiment, and developed further by the same authors [11][12][13]. About the vertical axis, the torsion of the flight chain is traditionally modeled as a mass-spring system [14][15][16][17][18][19][20][21][22]. Although the stiffness is generally experimentally determined by system identification, which requires to deploy the whole system and process in-flight data, the bi-filar pendulum model allows predicting analytically the stiffness of balloon flight chains [23,24].…”

Air-Launch Experiment Using Suspended Rail Launcher for Rockoon

“…Nevertheless, the azimuth angle has never been controlled in previous rockoon projects. Attitude control technologies of gondolas on balloons have been researched in the balloon-borne telescope system [14,15]. A suspended telescope was oriented to the target direction with an accuracy of one arcminute using a control moment gyroscope (CMG) as the attitude control device.…”

“…The solutions ω 1 , ω 2 are the 1st and 2nd mode frequencies (ω 1 < ω 2 ). The mode shape parameter is obtained by substituting Equation (14) to Equation (12).…”