There are many sources of range error in a Global Positioning Satellite (GPS) signal that has traveled to a receiver near the earth's surface. Among these is the ionospheric group delay. In the past, a single-state, ...

Autonomous robots are being considered for increasingly capable roles in our society, such as urban search and rescue, automation for assisted living, and lunar habitat construction. To fulfill these roles, teams of ...

Many demanding aerospace missions today require maneuverable re-entry vehicles that can fly trajectories that have stringent path and terminal constraints, including those that cannot be written as drag or energy constraints. ...

Traditional trajectory design approaches apply optimal control techniques to maximize desired performance, subject to specified constraints. Normal metrics and constraints are composed of the deterministic states and ...

From residual and Jacobian assembly to the linear solve, the components of a high-order, Discontinuous Galerkin Finite Element Method (DGFEM) for the Navier-Stokes equations in 3D are presented. Emphasis is given to residual ...

The problem of performance optimization for a trans-Atlantic shuttle abort is considered. At five points during the second stage of ascent, a failure of a main engine occurs, which necessitates an abort from the nominal ...

Small munition effectiveness is a function of miss distance from the target and ability to achieve a steep flight path angle at the target. Many small guided munitions have limited control authority to achieve these competing ...