Spacecraft Subsystems

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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

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

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  

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  

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

 

GPS Receiver OD Object Editor 

GPS Receiver OD Object Editor 

 

Transponder OD Object Editor 

Transponder OD Object Editor