Author

• Seyed Hamid Jalali Naini

Tarbiat Modarres

Abstract

In this paper, a closed
loop strategy in the vertical plane is derived in order to determine the thrust direction of a launch vehicle in terms of velocities
to
be
gained The two velocities-to-be-gained are utilized, here, for a given altitude and zero vertical speed in a specied nal time The formulation is obtained for constant gravity assumption, but it works when the velocities
to-be-gained are obtained for a spherical-Earth model via explicit or implicit relations-

Keywords

• -Gainede