Abstract

This paper presents a guidance philosophy that is useful for missions with both complex specifications on injection conditions and a requirement for closely following a given trajectory profile. The position and/or velocity profiles are functions of current speed and time-to- go to the desired injection speed. This type of guidance philosophy makes it possible to satisfy constraints on altitude, flight path angle, speed, orbital inclination, and angle of attack at injection. Both the preflight computations on the ground and the airborne computations can be accomplished with a reasonable effort. The main contribution of this paper in- volves pitch and yaw steering computations. The application of this philosophy to repre- sentative problems and the steps needed to determine the parameters in the guidance equa- tions are discussed. Some simulation results are given for an injection mission involving a Dyna-Soar type vehicle. These results demonstrate the high accuracy capability of this tech- nique and indicate that it should be applicable to other missions with similar guidance objectives.

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