Re-Entry Guidance Using an Energy-State Equation

A State-Dependent Riccati Equation Approach to Atmospheric Entry Guidance

This paper investigates the use of state-dependent Riccati equation control for closed-loop guidance of the hypersonic phase of atmospheric entry. Included are a discussion of the development of the state-dependent Riccati equations, their outgrowth from Hamilton-Jacobi-Bellman theory, a discussion of the closed-loop nonlinear system’s closed-loop stability and robustness from both a theoretica...

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...

An equation of state for argon

An analytical equation of state was applied to calculate the thermodynamic properties for argon.The equation of state is that of Song and Mason. It is based on a statistical-mechanical perturbationtheory of the hard convex bodies and can be written as fifth-order polynomial in the density. Thereexist three temperature-dependent parameters: the second virial coefficient, an effective molecularvo...

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...

The Equation of State of an Energy Landscape