The adaptive entry guidance based on 3D obtainable space concept

A three-dimension obtainable space concept for entry guidance subjected to path constraints is developed in this paper. The key characteristics of this method is that it can transform the path constraints of heating rate and dynamic pressure into control variable constraints which are bank angle and attack angle, obtaining a three-dimensional control variables space. The transformation can substantially simplify the entry guidance and trajectory design especially online design. The proportional terminal guidance law is introduced in the entry guidance which could fulfill the integrated design of entry guidance and terminal guidance through applying the 3D obtainable space concept.