Generalized Formulation of Weighted Optimal Guidance Laws with Impact   Angle Constraint
  The purpose of this paper is to investigate the generalized formulation of weighted optimal guidance laws with impact angle constraint. From the generalized formulation, we explicitly find the feasible set of weighting functions that lead to analytical forms of weighted optimal guidance laws. This result has potential significance because it can provide additional degrees of freedom in designing a guidance law that accomplishes the specified guidance objective. 
Chang-Hun Lee, Min-Jea Tahk, and Jin-Ik Lee
cs.SY