Reaction wheel Parameter Identification

Microsat Systems Canada Inc.(以下简称“MSCI”)是一家总部设在安大略省密西索加的加拿大私人持股公司。MSCI是加拿大过去二十年里世界著名的微型卫星制造商，在姿态控制系统(ACS)设计、ACS传感器和执行器方面拥有全球记录。尤其是MSCI的反作用轮--ACS执行器套件中的关键部件--已经发射并在轨道上运行，积累了216年的飞行遗产和580亿次无故障旋转[1]。我们在约克大学的研究团队建议将我们目前的ACS研究扩展到对MSCI的反作用轮特别感兴趣的反作用轮参数识别进行检查。我们提出了一种新的方法来表征车轮的性能和估计反作用轮转子的转动惯量，这被认为是提供更高精度姿态控制的关键参数。这项拟议的研究直接支持了摩根士丹利资本国际公司目前改进制造和测试反应轮的努力。我们的目标是提供可靠和经济的手段来更好地评估车轮的性能，并为此类商业产品的制造提供节约成本的方法建议。尽管我们在开发先进的确定和控制算法方面取得了重大进展，旨在补偿姿态控制硬件中的不确定性，但在传感器和执行器建模方面仍存在显著差距。例如，为了在小型航天器上实现角秒级的指向精度，仍然非常需要高保真的执行器模型和执行器参数的估计。本研究的贡献在于发展了一种新颖可靠的姿态执行器建模方法。特别是，我们建议开发一种方法来建立反应轮的模型并估计其关键的不可测量参数。

Microsat Systems Canada Inc. (referred to as 'MSCI hereinafter) is a privately held Canadian corporation basedin Mississauga, Ontario. MSCI is a world-renowned premiere builder of microsatellites in Canada over the pasttwo decades with worldwide track record in attitude control system (ACS) design, ACS sensors and actuators.In particular, MSCI's reaction wheels - critical component in ACS actuator suite - have been launched and areoperational in orbit, with over 216 years of accumulated flight heritage and 58 billion revolutions withoutfailure [1]. Our research team at York University is proposing to extend our current ACS research to examinereaction wheel parameter identification with special interest in MSCI's reaction wheels. We propose to developa novel method to characterize the wheels' performance and estimate the moment of inertia of the reactionwheel's rotor, which is considered a key parameter in providing a higher accuracy attitude control. Theproposed research is in direct support of MSCI's current efforts to improve the manufacturing and testing theirreaction wheels. We aim to provide reliable and cost-effective means to better evaluate the wheels'performance and advice on cost-saving methods for manufacturing of such commercial products.While we have made significant progress towards developing advanced determination and control algorithmsdesigned to compensate for uncertainty in attitude control hardware, there still exist significant gap in sensorand actuator modeling. For example, there is still a great need for high-fidelity actuator model and estimationof actuator parameters to achieve arc-second level pointing accuracy on small spacecraft. The contribution ofthis study is in developing novel and reliable ways to model attitude actuator. In particular, we propose todevelop a methodology for modeling reaction wheels and estimate their key immeasurable parameters.