TR2018-078

On-Off Quantization of an MPC Policy for Coupled Station Keeping, Attitude Control, and Momentum Management of GEO Satellites


    •  Caverly, R., Di Cairano, S., Weiss, A., "On-Off Quantization of an MPC Policy for Coupled Station Keeping, Attitude Control, and Momentum Management of GEO Satellites", European Control Conference (ECC), DOI: 10.23919/ECC.2018.8550336, June 2018.
      BibTeX TR2018-078 PDF
      • @inproceedings{Caverly2018jun2,
      • author = {Caverly, Ryan and Di Cairano, Stefano and Weiss, Avishai},
      • title = {On-Off Quantization of an MPC Policy for Coupled Station Keeping, Attitude Control, and Momentum Management of GEO Satellites},
      • booktitle = {European Control Conference (ECC)},
      • year = 2018,
      • month = jun,
      • doi = {10.23919/ECC.2018.8550336},
      • url = {https://www.merl.com/publications/TR2018-078}
      • }
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  • Research Area:

    Control

This paper introduces a novel on-off quantization scheme used with a control architecture based on model predictive control (MPC) to simultaneously perform station keeping, attitude control, and momentum management of a nadirpointing geostationary satellite equipped with three reaction wheels and four on-off electric thrusters. The MPC policy includes an inner-loop SO(3)-based attitude control law to maintain a nadir-pointing attitude, and an outer loop for station keeping and momentum management. The continuous thrust command generated by the MPC policy is quantized as a single on-off pulse every feedback period in such a way that the predicted error in the states induced by quantization is minimized. This quantization scheme introduces very limited change in behavior and performance compared to results with the non-quantized MPC policy, and uses significantly less on-off pulses compared to other approaches in the literature, such as pulse-width modulation. The tuning parameters of the proposed quantization scheme are discussed in detail and their effects on closed-loop performance are analyzed numerically.

 

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