IMPACT ANGLE CONTROL GUIDANCE CONSIDERING GRAVITY EFFECT

摘要

This paper proposes an impact angle control guidance law with the terminal acceleration constraint considering the gravity effect. To develop the law, the desired line-of-sight (LOS) angle to satisfy the terminal impact angle and acceleration constraints is defined. The guidance command is derived by letting the actual LOS angle converge to the desired LOS angle at the terminal stage of the homing. When designing the law, the gravity effect is considered so that the desired terminal constraints can be satisfied accurately under the realistic pitch-axis engagements. Furthermore, user-desired zero terminal acceleration can also be achieved directly because an additional gravity compensation is not required. For the performance evaluation, numerical simulation is conducted and the result demonstrates that the proposed guidance law achieves the desired impact angle and zero terminal acceleration under the gravity effect.