Abstract
A new control method for the orbital transfer of the Space Solar Power Systems (SSPS) by the solar electric propulsion is presented. In this method, SSPS is launched from a place near the equator such as the Christmas Island, both yaw and pitch angles of the thrust direction are fixed to zeros, and the thrust-off periods are assigned optimally near the perigee in the final stage of the transfer. This method, especially for large spacecrafts such as SSPS, has the advantage that the heavy momentum wheel for the thrust vector control is not necessary.
