A new solar sail orbit

Solar sail is used to achieve a geocentric sun-synchronous frozen orbit. This kind of orbit combines the characteristics of both sun-synchronous orbits and frozen orbits. Furthermore, the impossible orbits for a typical spacecraft such as sun-synchronous orbits whose inclination is less than 90 are also possible for solar sail. To achieve a sun-synchronous frozen orbit, the characteristic acceleration of the sail is chosen properly. In addition, the attitude of the sail is adjusted to keep the sun-synchronous and frozen characteristics. The perturbations including atmosphere drag, third-body gravitational forces and shaded regions are discussed, where the atmosphere drag is cancelled by solar radiation pressure force, third-body gravitational forces have negligible effects on the orbit and the shaded region can be avoided by choosing the classical orbit elements of the sail. At last, a numerical example is employed to validate the sun-synchronous frozen characteristics of the sail.