|Top Previous Next|
FreeFlyer is a tool for spacecraft mission design and analysis. As spacecraft are dynamic objects, a mission design and analysis tool must simulate the motion of the spacecraft, both spatially and temporally. FreeFlyer uses a "Propagator" object to model spacecraft motion. There are two ways to propagate, or "step", the Spacecraft: an integration algorithm can be used in conjunction with a force model to step the Spacecraft through time, or an external ephemeris file can be used to specify spacecraft state information including epoch, location, attitude, and rates of change. There are many Propagators available in FreeFlyer. Propagators can be divided into two main categories, Ephemerides and Integrators.
Continue to the pages linked below for examples of how to set up and use a Spacecraft propagator. There are two ways to do most of this set up: via Object Editor, or via FreeFlyer Script. In general, Object Editors are a GUI-based system for speedy set up, and FreeFlyer Script gives more complete control of the properties and methods available for an object. For more on using Object Editors, see Creating/Editing Objects. For more on FreeFlyer Script, see Syntax and the FreeForm Script Editor.
Table of Contents
See the pages listed below for more information on spacecraft propagation and other related topics.