Levitated-body ultra-high pointing accuracy and stability satellite platform of the CHASE mission

Abstract

The CHASE satellite is designed based on the novel ultra-high pointing accuracy and stability levitated-body satellite platform, which breaks the traditional idea of rigidly connecting the satellite platform and payload. When operating in orbit, the platform and payload are non-connected and spatially levitated. By separately arranging the "noisy" and "quiet" devices, the complicated influence of platform vibration on the payload pointing direction is effectively avoided. Using the novel master-slave collaborative control method, the pointing accuracy and stability of the payload are improved considerably. In this paper, the basic principles, overall scheme, control method, and engineering implementation of a levitated-body satellite platform are discussed. Combined with the CHASE mission in-orbit data, the actual attitude pointing precision and stability of a levitated-body satellite platform are analyzed and evaluated.

In-Flight Calibration of Lorentz Actuators for Non-Contact Close-Proximity Formation Satellites with Cooperative Control

“…The distribution of the output force can be achieved through minimum norm decoupling, but the decoupling is effective only when the force output of NCLA is accurate, so the performance of NCLA output force directly affects the smooth execution of in-flight missions. However, although the output force of NCLA can be calibrated on the ground, in actual in-flight applications, the control performance of the NCLA is affected by issues such as material out-gassing, relative coupling between the position and attitude of the two modules in micro-gravity, non-uniformity of the magnetic field caused by the space magnetic field, and the uncertainty of the installation matrix of the NCLA due to measurement methods [24]. Therefore, to ensure the effectiveness of the NCLA in-flight, it is necessary to accurately calibrate the output.…”

Internal Activities in a Solar Filament and Heating in Its Threads

“…The data were observed on 2022 November 1 from 16:50 UT to 17:15 UT with a target of AR 13135 by the spaceborne Atmospheric Imaging Assembly (AIA; Lemen et al 2012) et al 2022a;Zhang et al 2022), and the Solar Upper Transition Region Imager (SUTRI; Bai et al 2023;Wang et al 2023).…”