PATRIUS is a core space dynamics Java library that enables to quickly develop high level algorithms such as orbit extrapolator. PATRIUS contains several sub-libraries that work together and cover low level classes (i.e.: such as matrix, vectors, orbits parameters) as well as high level classes and interfaces (i.e.: numerical propagators, attitude laws, manoeuvers sequences).
All the main domains of space dynamics are available:
Analysis, algebra and geometry core library (quaternions, derivable functions, integrators …)
Core objects for space dynamics (dates, orbits, frames...)
Orbit propagation: analytical, semi-analytical and numerical propagators, a full set of force models
Maneuvers: impulsive or continuous thrust, sequences
Attitude: extensible set of attitude laws, sequences and guidance framework
Events: event detection (orbital, sensor events, etc.) and post-processing (chronograms)
Spacecraft: characteristics of mass, geometry (drag force), sensors field of view, etc.