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5 November 2014 Inertially stabilized line-of-sight control system using a magnetic bearing with vernier gimbaling capacity
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Line of sight stabilization and control system is widely used in pointing and stabilizing the line of sight of optical sensors. Multi-axis gimbals configurations are commonly used for isolating disturbance from the angular motion of the base where the stabilization platform is mounted. However, in the case of large payload, nonlinear friction and the bandwidth limit of the servo loop can greatly diminish the performance of the whole system. Magnetic actuators, because of their high force per mass capability and non-friction characteristic, are promising means of achieving high-accuracy stabilization. Nevertheless, the gap between magnetic actuators and the payload is very small, which limits the slewing range of the line of sight as well as the angular motion range of the base that can be isolated. A novel two-stage stabilization configuration is developed, which combines multi-axis gimbals configuration and magnetic actuators as well as both of their advantages. At the first stage, a multi-axis gimbals configuration is adopted to isolate the large angular motion of the base while at the second stage magnetic actuators are utilized to perform high-accuracy stabilization. A so-called "stabilizing inside and tracking outside" scheme is carried out to perform two-stage stabilization control. The advantage of this configuration compared with conventional configuration is analyzed through analytical method. Finally, the effectiveness of the design is investigated through simulation studies.
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Zhuchong Lin and Kun Liu "Inertially stabilized line-of-sight control system using a magnetic bearing with vernier gimbaling capacity", Proc. SPIE 9272, Optical Design and Testing VI, 92720Q (5 November 2014);

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