Test Mass Capture Control for Drag-Free Satellite Based on State-Dependent Riccati Equation Method

Test Mass Capture Control for Drag-Free Satellite Based on State-Dependent Riccati Equation Method

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The drag-free satellite plays an important role in the space-based gravitational wave observatory.The capture control of test mass after release is a crucial technology that can affect the success of the mission.The test mass must be released to the center of the electrostatic suspension cage accurately.This End Table paper presents a nonlinear dynamic model of drag-free satellites in Lagrange formalism.A capture control scheme Fuel Delivery for test mass release phase is proposed based on the state-dependent Riccati equation (SDRE) strategy.

To deal with the actuator saturation problem, a nonlinear saturation model is introduced to the dynamics of satellite, while the SDRE strategy is applied to the non-affine system.The effectiveness of the proposed methodology is verified by the numerical simulation for the drag-free satellite.