OREKIT ORbits Extrapolation KIT
Download

OREKIT Ranking & Summary

OREKIT Tags

Java Java library library ORbits Extrapolation KIT ORbits

OREKIT Description

ORbits Extrapolation KIT OREKIT (also known as ORbits Extrapolation KIT) is a free low level space dynamics library written in Java.It provides basic elements (orbits, dates, attitude, frames ...) and various algorithms to handle them (conversions, analytical and numerical propagation, pointing ...). Here are some key features of "OREKIT": Time: · high accuracy absolute dates · time scales (TAI, UTC, GPS, TCG, TT ...) · transparent handling of leap seconds Geometry: · frames hierarchy supporting fixed and time-dependent (or telemetry-dependent) frames · predefined frames (J2000, ITRF2000 (A and B) and intermediate frames, Veis, topocentric) · user extensible (used operationally in real time with a set of about 60 frames on several spacecrafts) · transparent handling of IERS Earth Orientation Parameters · transforms including kinematic combination effects · composite transforms reduction and caching for efficiency · extensible central body shapes models (with predefined spherical and ellipsoidic shapes) · cartesian and geodesic coordinates, kinematics Spacecraft state: · cartesian, keplerian, circular and equinoctial parameters · Two-Lines Elements · transparent conversion between all parameters · automatic binding with frames · attitude state and derivative · mass management Propagation: · analytical propagation models (Kepler, Eckstein-Heschler, SDP4/SGP4 with 2006 corrections) · numerical propagators · customizable force models · central attraction · gravity models (automatic reading of SHM (for Eigen models) and EGM formats potential files, even compressed) · atmospheric drag (DTM2000, Jacchia-Bowman 2006 and simple exponential models) · third body attraction · radiation pressure with eclipses · multiple maneuvers · state of the art ODE integrators (adaptive stepsize with error control, continuous output, switching functions, G-stop, step normalization ...) · serialization mechanism to store complete results on persistent storage for later use · tabulated ephemerides · file based · memory based · integration based · unified interface above analytical/numerical/tabulated propagators for easy switch from coarse analysis to fine simulation with one line change · all propagators can be used in several different modes · slave mode: propagator is driven by calling application · master mode: propagator drives application callback functions · ephemeris generation mode: all intermediate results are stored during propagation and provided back to the application which can navigate at will through them, effectively using the propagated orbit as if it was an analytical model, even if it really is a numerically propagated one, which is ideal for search and iterative algorithms · handling of discrete events during integration (models changes, G-stop, simple notifications ...) · predefined discrete events · ascending and descending node crossing · apogee and perigee crossing · elevation with respect to a topocentric frame (raising/setting) · date · impulse maneuvers Attitude: · extensible attitude evolution models · predefined laws · central body related attitude (nadir pointing, center pointing, target pointing, yaw compensation, yaw-steering), · orbit referenced attitudes (LOF aligned, offset on all axes), · space referenced attitudes (inertial, celestial body pointed, spin stabilized) Requirements: · Java 2 Standard Edition Runtime Environment What's New in This Release: · The equinox-based frames family with IAU1980 precession-nutation models that are still used by many legacy systems are now supported. · The data loading mechanism used to retrieve IERS data (Earth Orientation Parameters, UTC-TAI history) and JPL ephemerides is now also used to retrieve gravity field files. · This mechanism has also been vastly improved to support new use cases (loading from disk, from classpath, from network delegating loading to an external library, etc.). · Support for the TDB time scale has been added.

OREKIT Related Software