Abstract: The problem of maintaining control is investigated for the hybrid propulsion spacecraft formation around the planet centered displaced orbit. Firstly, the dynamics model of spacecraft formation near a planetary suspension orbit is established, and then the relative motion equation of spacecraft formation is derived via linearizing the model. In terms of control strategy, an integral sliding mode formation flight controller is designed, which can maintain and control formation configuration via adjusting the size of solar pressure and inter satellite Coulomb force. The controller has the characteristics of fast response and little dependence on system model. Finally, the numerical simulation shows that the proposed control method can achieve formation keeping control near the hovering orbit of the planet under the condition of disturbance.

Key words: displaced orbit;solar sail, coulomb force, formation maintaining, integral sliding mode control