Abstract: To study the problems of decoupling and eliminating precession for zero-momentum reaction wheel system,a new method to eliminate precession was put forward.The stability of zero-momentum wheel satellite,only using wheel as the executive component,was analysed.The principle which was used by the bias momentum system to eliminate precession and nutation was utilized to zero-momentum wheel system.According to the characteristic of zero-momentum reaction wheel,the magnetic control laws were improved.The proposed scheme was applied to zero-momentum wheel system to cope with its attitude control problems while non-decoupling. Numerical simulations were conducted,and the results demonstrate the feasibility and validity of the proposed method.

Key words: Eliminating precession, Wheel decoupling, Attitude control, Zero-momentum wheel, Three-axis stabilization satellite