Subsystems represent the hardware "attachments" and the conceptual systems related to the Spacecraft that are used for maneuvering, sensing, communication, and visualization in FreeFlyer. All can be created in script or from the Spacecraft Object Editor. The following subsystems are available:
•Proximity Zones •Sensors •Tanks •Thrusters •Transponders and Receivers |
Proximity Zones
•Theoretical volume attached to the spacecraft •Can be modeled as a rectangle or spheroid •Used for visualizing the Spacecraft or other points •Used for proximity analysis between Spacecraft and other objects •Proximity Zones are discussed further in the Coverage and Contact Analysis Guide. |
Proximity Zone Object Editor with Preview Window
Sensors
•Define the "eyes" of the spacecraft •Can be modeled as anything from a simple cone to custom shape •Used to perform visibility checks of other objects with respect to the sensor's field of view •Used for visualization purposes of other object as well •Sensors are discussed further in the Coverage and Contact Analysis Guide |
Cone Sensor with 45-degree half angle
Tanks
•Hardware component attached to the spacecraft •Represent a mass source that is used in conjunction with thrusters to model maneuvers •Tanks are discussed further in the Maneuvering Guide |
Spherical Tank Object Editor
Thrusters
•Define maneuver direction and force properties •Used in conjunction with tanks to model maneuvers •Thrusters are discussed further in the Maneuvering Guide |
Thruster Object Editor
Transponders and Receivers
•Used to communicate with GroundStations and other Spacecraft •Transponders and Receivers are discussed further in the Orbit Determination Guide |
GNSS Receiver OD Object Editor
Transponder OD Object Editor