Closed-form solution of attitude command generation for spin-to-spin maneuver |
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Institution: | 1. Defense and Space Technology Center, Agency for Defense Development, 34060 Daejeon, Republic of Korea;2. Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, 34141 Daejeon, Republic of Korea;3. School of Aerospace and Mechanical Engineering, Korea Aerospace University, 10540 Goyang, Republic of Korea |
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Abstract: | In recent earth observing missions, agile satellites enable various imaging modes beyond the traditional along-track strip imaging. However, it requires maneuvering with boundary conditions of considerable angular velocity, i.e., spin-to-spin maneuvering. This paper proposes an attitude command generation method for spin-to-spin maneuvering that can provide feedforward commands for the attitude control loop. A general solution for arbitrary flight time is provided which steers a satellite to the given final attitude and angular velocity at the prescribed time. In addition, an alternative method is proposed that further improves the maneuvering speed, which is applicable to small-angle maneuvering cases. The proposed solutions are both closed-form which are more intuitive and easier to comprehend than numerical solutions. It also has a great advantage in computational efficiency, which could enable its use on-board in real time. Numerical examples demonstrate the performance of the proposed methods in a single maneuvering case as well as in a consecutive maneuvering case integrated with a realistic earth observing scenario. |
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Keywords: | Agile satellite Attitude control command Closed-form solution Earth observing mission Feedforward input Spin-to-spin maneuver |
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