The Caltech Submillimeter Observatory telescope was completely disassembled in 2023 October and will be shipped from Hawaii, USA to the new site at Chajnantor Plateau, Chile in 2024, where it is expected to be refurbished and renamed the Leighton Chajnantor Telescope (LCT). Since the much stronger wind load at the new site will provide a great challenge for LCT’s realization of a higher pointing and tracking accuracy, an active disturbance rejection controller (ADRC) is designed for LCT’s pointing control system. Due to the unavailability of LCT during its relocation process, it is necessary to develop a testbed to verify the performance of ADRC by constructing a synthesized simulation model of LCT’s pointing control system, including a mechanical dynamics model of the antenna, an analog circuit model of the motor drive system, a mathematical model of the direct current motors and the reducers, and a wind disturbance model. On the testbed, ADRC undergoes simulations to verify its capability to eliminate the negative impact of strong wind disturbance on LCT’s pointing control performance. The simulation results show that ADRC can bring benefits in improving LCT’s pointing and tracking accuracy when facing strong wind disturbance.

中文翻译：

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Leighton Chajnantor 望远镜的综合建模和自抗扰控制

加州理工学院亚毫米天文台望远镜于2023年10月完全拆解，将于2024年从美国夏威夷运往智利查南托高原新址，预计在那里进行翻新并更名为莱顿查南托望远镜（LCT）。由于新站点更强的风荷载对LCT实现更高的指向和跟踪精度提出了巨大的挑战，因此为LCT的指向控制系统设计了自抗扰控制器（ADRC）。由于LCT在搬迁过程中无法使用，需要开发一个测试平台来验证ADRC的性能，构建LCT指向控制系统的综合仿真模型，包括天线的机械动力学模型、天线的模拟电路模型等。电机驱动系统、直流电机和减速器的数学模型、风扰模型。在试验台上，ADRC进行了仿真，验证其消除强风扰动对LCT指向控制性能负面影响的能力。仿真结果表明，ADRC能够在面对强风干扰时提高LCT的指向和跟踪精度。