Use of the Method of Guidance by a Required Velocity in Control of Spacecraft Attitude

Mikhail Valer’evich Levskii (Research Institute of Space systems, Khrunichev State Space research-and-production Center, Korolev, Russia)

Article ID: 3725

Abstract


We apply the method of guidance by a required velocity for solving the optimal control problem over spacecraft’s reorientation from known initial attitude into a required final attitude. We suppose that attitude control is carried out by impulse jet engines. For optimization of fuel consumption, the controlling moments are calculated and formed according to the method of free trajectories together with principle of iterative control using the quaternions for generating commands to actuators. Optimal solution corresponds to the principle “acceleration - free rotation - separate corrections - free rotation - braking”. Rotation along a hitting trajectory is supported by insignificant correction of the uncontrolled motion at discrete instants between segments of acceleration and braking. Various strategies of forming the correction impulses during stage of free motion are suggested. Improving accuracy of achievement of spacecraft's final position is reached by terminal control using information about current attitude and angular velocity measurements for determining an instant of beginning of braking (condition for start of braking based on actual motion parameters is formulated in analytical form). The described method is universal and invariant relative to moments of inertia. Developed laws of attitude control concern the algorithms with prognostic model, the synthesized control modes are invariant with respect to both external perturbations and parametric errors. Results of mathematical modeling are presented that demonstrate practical feasibility and high efficiency of designed algorithms.

Keywords


Method of guidance by a required velocity ;Iterative control ;Free trajectory method ;Terminal control ;Quaternion ;Spacecraft attitude ;Prognostic model

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References


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DOI: https://doi.org/10.30564/jmer.v4i2.3725

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