A Displacement Mode Differential Golden Section Adaptive Non-Drag Control Method

Abstract

The present invention is a differential golden section adaptive non-drag control method of displacement mode, and the specific steps are as follows: step 1, based on the characteristic model theory, carry out second-order feature modeling for the non-drag loop; step 2, use the gradient method to identify the characteristic model parameters; Step 3: Based on the estimated characteristic parameters, construct a differential golden section adaptive control law design to complete the entire drag-free control method. The invention can deal with the non-drag satellite displacement mode with large uncertainty and open-loop instability characteristics, and by proposing a differential golden section adaptive control strategy, it solves the problem that the traditional second-order adaptive controller is difficult to realize the high relative order of the displacement mode. The problem of closed-loop stabilization of unstable properties. The method can effectively adapt to the large uncertainty of thruster parameters while ensuring the closed-loop steady-state characteristics, so that the control performance of the displacement mode can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of spacecraft control, and relates to a displacement mode differential golden section adaptive non-drag control method. Background technique [0002] Drag-free control is a key technology in several current and future space missions. In a broad sense, no-tow satellites are divided into displacement mode and acceleration mode. The working principle of the former is to use thrusters to offset the non-conservative resultant force on the satellite platform, and to make the mass suspended in the middle of the satellite move synchronously with the satellite platform through relative displacement feedback control. , while the latter replaces the mass with an accelerometer that directly measures external disturbances and uses the acceleration measurements for feedback control. The mass block in the displacement feedback mode has a lower noise level, and is often used in basic space physics experiments, such as grav...

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Problems solved by technology

[0004] The technical problem solved by the present invention is: Aiming at the drag-free satellite displacement mode with large uncertainty and open-loop instability characteristics, a differential golden section adaptive control strategy is proposed, which solves the problem that the traditional second-order adaptive controller is difficult to realize The problem of closed-loop stabilization of high relative order instability in displacement mode

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