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In-orbit results from the attitude determination and control system of ALSAT-2B
Published online by Cambridge University Press: 10 June 2021
Abstract
The Algerian Space Agency has been active in the field of microsatellite engineering for more than 15 years and has successfully developed microsatellites under several know-how transfer technology programs, six to date. This paper presents the flight results and lessons learned from the attitude determination and control system (ADCS) flown on the ALSAT-2B satellite, an Earth observation microsatellite, by analysing the behaviour of the satellite from the initial attitude acquisition through the coarse pointing mode then the nominal mode, where the payload is first tested, and finally the orbit control mode. The spacecraft was launched on 26 September 2016 and placed into a 670km Sun-synchronous orbit with a solar local time at an ascending node of 22:15. The ADCS performance presented here mainly focuses on the launch and early operation results. ALSAT-2B includes four reaction wheels in a pyramidal configuration, three gyros, three Sun sensors, three magneto-torquers, one magnetometer, and one star tracker for agile and accurate attitude control. In addition, a propulsion system based on four 1N hydrazine thrusters is also used on board the microsatellite. The main new development in this platform compared with previous ones of the same type is the fusion of the star tracker and measurements by the three gyroscopes into one gyrostellar estimator that was implemented for the first time on ALSAT-2B, and the pyramidal configuration of the wheels, aiming to increase the angular momentum. The results obtained from the early launch operations for different ADCS modes are very encouraging and fulfil all the requirements set during design and testing. Currently, the satellite has accomplished its fourth year in orbit and is still operational and producing high-quality images.
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- © The Author(s), 2021. Published by Cambridge University Press on behalf of Royal Aeronautical Society
References
REFERENCES
Sandau, R. Status and trends of small satellite missions for Earth observation. Acta Astronaut, 2010, 66, pp 1–12.Google Scholar
Wertz, J.R., Everett, D.F. and Puschell, J.J. Space mission engineering: the new SMAD, Hawthorne, CA: Microcosm Press, 2011.Google Scholar
Brady, T., Tillier, C., Brown, R., Jimenez, A. and Kourepenis, A. The Ineartial Stellar Compass: A New Direction in Spacecraft Attitude Determination. Proocedings of 16th AIAA/USU Conference on Small Satellites, Utah, USA, 2002.Google Scholar
Steyn, W.H. Stability, Pointing, and Orientation. Handbook of Small Satellites, 1–43, 2020.CrossRefGoogle Scholar
Alary, D. and Lambert, H. The Myriade product line, a real success story. Acta Astronautica, 2007, 61, (2007), pp 223–227.CrossRefGoogle Scholar
Argoun, M.B. Recent design and utilization trends of small satellites in developing countries. Acta Astronautica, 2012, 71 (2012), pp 119–128.CrossRefGoogle Scholar
Benzeniar, H. and Meghabber, M.A. Reaction Wheels on a Pyramid Configuration 6 years In-orbit Results from AlSat-2A Remote Sensing Satellite. Proceedings of the 11th IAA Symposium on Small Satellites for Earth Observation, Berlin, Germany, April 24–28, 2017, paper: IAA-B11-1403, 2017.Google Scholar
Buisson, F., Cussac, T. and Parrot, M. Demeter: on ground validation and first in flight results. Proceedings of the 4S Symposium: Small Satellites, Systems and Services (ESA SP-571). 20–24 September 2004, La Rochelle, France, 2004.Google Scholar
Cussac, T., Clair, M.A., Ultre -Guerard, P., Buisson, F., Lassalle-Balier, G., Ledu, M., Elisabelar, C., Passot, X. and Rey, N. The Demeter microsatellite and ground segment. Planetary and Space Science, 2006, 54, pp 413–427.CrossRefGoogle Scholar
Darnon, F., LeDeuff, Y. and Pillet, N. DEMETER and PARASOL Micro-Satellites: Flight Performances of the 1N Hydrazine Propulsion System. Proceedings of the 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 10–13 July 2005, Tucson, Arizona, AIAA 2005-3953, 2005.CrossRefGoogle Scholar
Ghezal, M., Polle, B., Rabejac, C. and Montel, J. Gyro stellar attitude determination. Proceedings of the 6th International ESA Conference on Guidance, Navigation and Control Systems, Loutraki, Greece, 17–20 October 2005 (ESA SP-606, January 2006), 2006.Google Scholar
Kopacz, J.R., Herschitz, R. and Roney, J. Small satellites an overview and assessment. Acta Astronaut., 2020, 170 (2020), pp 93–105.CrossRefGoogle Scholar
Le Du, M., Maureau, J. and Prieur, P. Myriade: an adaptative AOCS concept. Proceedings of the the 5th international ESA conference on Spacecraft Guidance Navigation and Control Systems, Frascati, 22–25 October 2002, 2002.Google Scholar
Limouzin, G., Siguier, M. and Chikouche, A. AlSat-2 Program - Overview, 1 year from launch, Proceedings of the International Workshop on Earth Observation Small Satellites for Remote Sensing Applications. Kuala Lumpur, Malaysia, Nov. 23–27, 2007.Google Scholar
Samason, P. High pointing accuracy with the PICARD microsatellite. Proceedings of the 17th IFAC Symposium on Automatic Control in Aerospace, Volume 40, Issue 7, Pages 1–894 (2007), 25–29 June 2007, Toulouse, France, 2007.Google Scholar
SerÈne, F. and Corcoral, N. PARASOL and CALIPSO: Experience Feedback on Operations of Micro and Small Satellites. Proceedings of the SpaceOps 2006 Conference, 2006.CrossRefGoogle Scholar
Tatry, B. and Claire, M.A. Myriade CNES Small Satellites Programme. Performances, Missions, Tool for education and cooperation. Proceedings of the Small satellites, systems and services; 4S symposium, 25–29 September 2006, Chia Laguna, Sardinia, Italy, 2006.CrossRefGoogle Scholar
Torres, A., Fallet, C., Julio, J.M., Maureau, J., Montel, J., Pittet, C. and Prieur, P. In-orbit results from parasol. Proceedings of the 6th International ESA Conference on Guidance, Navigation and Control Systems, Loutraki, Greece, 17–20 October 2005 (ESA SP-606, January 2006), 2006.Google Scholar