Abstract: Abstract：Aiming at orbital maintenance of the Walker constellation configuration in medium earth orbit considering the effects of orbital perturbation, we discuss the excursion of the constellation configuration. After this, the long-time maintenance control methods and the control strategy of the constellation configuration are discussed. The perturbation penalty method has been analyzed. The numerical differential modified method of the constellation configuration is presented and discussed. Finally, the long-time orbital control strategy for global constellation is presented and simulated. Simulation analysis shows that the constellation configuration numerical differential modified method can achieve higher control calculation accuracy than constellation configuration perturbation penalty method.

Key words: satellite constellation, Walker constellation, constellation control, orbital control