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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Finite difference Newton-Raphson algorithm extension to solve variational equations for simultaneous optimization of trajectories and associated parameters
Satellite trajectory determination and expected errors for OGO 4 and Geos 1 orbits, noting geopotential, aerodynamic drag and integration contributions
Impulsive trajectories optimal and nonoptimal solutions, classifying known results for reference purposes
Multistage rocket trajectories optimized by second order numerical technique and digital computer program, considering coasting, vacuum flight and transition times
Low thrust trajectories for minimum time rendezvous between continuous thrust interceptor and passive target vehicle, comparing calculus of variations and steepest ascent analyses
Bolza problem of calculus of variations extended to trajectory optimization problems with several subarcs
Peano-Baker method for integration of variational equations to produce partial derivatives used in satellite trajectory estimation
Variational equations uniform closed solution for optimal trajectories during coast without use of numerical integration
Trajectory optimization of space vehicle with continuous thrust based on regularized equations, comparing perturbation method for earth-Jupiter rendezvous transfer
Numerical integration for continuously thrusting spacecraft optimal trajectory, considering rectangular Cartesian and polar cylindrical coordinates characteristics
Closed form solution for minimum fuel constant thrust trajectories for vehicle transfer in vacuum between arbitrary boundary conditions
Vector integral extension to optimal trajectory coordinate multiplier systems with constant of motion demonstrated for coast-arc problem
Branched trajectory optimization for split rocket vehicles using projected gradient or steepest descent method
Perturbative effects of Jupiter moons on spacecraft flyby and postencounter heliocentric trajectories, noting precision targeting
Normalized hodographic mapping for constrained trajectory families, discussing mapping concepts, information content and applications
Trajectory analysis of multiplanet Grand Tour mission to four large outer planets on single flight, discussing mission planning
Apollo type reentry trajectory optimization numerical methods
Subroutines, logic, and input/output formats for STEP programs on preflight and postflight trajectory measurement