Fixed-trim re-entry guidance analysis

Optimal Re-Entry Guidance of Space Vehicles

The applicability and the eeciency of a new numerical method for the real-time computation of closed loop controls is demonstrated by the simulation of the guidance of a space vehicle during atmosheric re-entry. This so-called repeated correction method is based on the one hand on the accessory minimum problem or the concept of neighboring extremals and on the other hand on the multiple shootin...

Parametric Analysis of Antares Re-entry Guidance Algorithms Using Advanced Test Generation and Data Analysis

Large complex aerospace systems are generally validated in regions local to anticipated operating points rather than through characterization of the entire feasible operational envelope of the system. This is due to the large parameter space, and complex, highly coupled nonlinear nature of the different systems that contribute to the performance of the aerospace system. We have addressed the fa...

Industrial IT for Papermaking Quality Based Re-Trim Optimization Unique solution for quality based re-trim optimization

Optimal Sliding-Mode Guidance Law for Fixed-Interval Propulsive Maneuvers

An optimal strategy based on minimum effort control and also with terminal positionconstraint is developed for an exoatmospheric interceptor with a fixed- interval guidance time. It isthen integrated with sliding-mode control theory to drive an optimal sliding-mode guidance law forfixed-interval guidance time. In addition, this guidance law is generalized for intercepting anarbitrarily time-var...

A Three-dimensional Predictive Entry Guidance Approach

The Space Shuttle’s two-dimensional entry trajectory planning method is extended to three dimensions. Both angle-of-attack and angle-of-bank variations are used to control the entry trajectory. The trajectory planning is done with a third-order system of differential equations using the drag and lateral accelerations as intermediate controls. The reduced-order planning problem is solved first i...