Satellites Plug-in

Classes
class	gTimeSpan
class	gSatWrapper
	Wrapper allowing compatibility between gsat and Stellarium/Qt. More...
class	SatellitesDialog
	Main configuration window of the Satellites plugin. More...
class	SatellitesImportDialog
struct	CommLink
	Radio communication channel properties. More...
struct	TleData
	Data structure containing unvalidated TLE set as read from a TLE list file. More...
struct	TleSource
	TLE update source, used only internally for now. More...
class	SatellitesListFilterModel
	Custom proxy model allowing filtering by satellite group and flag. More...
class	SatellitesListModel
	A model encapsulating a satellite list. More...
class	gSatTEME
	Sat position and velocity predictions over TEME reference system. More...
class	gVector
	This class implement the needed code to make vector calculations. More...
class	Satellite
	A representation of a satellite in Earth orbit. More...
class	Satellites
	Main class of the Satellites plugin. More...

Typedefs
typedef QSet< QString >	GroupSet
	Type for sets of satellite group IDs. More...
typedef QList< TleData >	TleDataList
typedef QHash< QString, TleData >	TleDataHash
typedef QList< TleSource >	TleSourceList

Enumerations
enum	SatelliteDataRole {   SatIdRole = Qt::UserRole, SatDescriptionRole, SatFlagsRole, SatGroupsRole,   FirstLineRole, SecondLineRole }
	Description of the data roles used in SatellitesListModel. More...
enum	SatFlag {   SatNoFlags = 0x0, SatDisplayed = 0x1, SatNotDisplayed = 0x2, SatUser = 0x4,   SatOrbit = 0x8, SatNew = 0x10, SatError = 0x20 }
	Flag type reflecting internal flags of Satellite. More...

Functions
double	AcTan (double sinx, double cosx)
	Four-quadrant arctan function. More...
double	Sqr (double arg)
	Returns square of a double. More...

Detailed Description

The Satellites plugin displays the positions of artifical satellites in Earth orbit based on a catalog of orbital data.

The Satellites class is the main class of the plug-in. It manages a collection of Satellite objects and takes care of loading, saving and updating the satellite catalog. It allows automatic updates from online sources and manages a list of update file URLs.

To calculate satellite positions, the plugin uses an implementation of the SGP4/SDP4 algorithms (J.L. Canales' gsat library).

Satellite Properties

Name and identifiers

Each satellite has a name. It's displayed as a label of the satellite hint and in the list of satellites. Names are not unique though, so they are used only for presentation purposes.

In the Satellite Catalog satellites are uniquely identified by their NORAD number, which is encoded in TLEs.

Grouping

A satellite can belong to one or more groups such as "amateur", "geostationary" or "navigation". They have no other function but to help the user organize the satellite collection.

Group names are arbitrary strings defined in the Satellite Catalog for each satellite and are more similar to the concept of "tags" than a hierarchical grouping. A satellite may not belong to any group at all.

By convention, group names are in lowercase. The GUI translates some of the groups used in the default catalog.

Satellite Catalog

The satellite catalog is stored on the disk in JSON format, in a file named "satellites.json". A default copy is embedded in the plug-in at compile time. A working copy is kept in the user data directory.

Configuration

The plug-ins' configuration data is stored in Stellarium's main configuration file.

Typedef Documentation

typedef QSet<QString> GroupSet

Type for sets of satellite group IDs.

Definition at line 62 of file Satellite.hpp.

Enumeration Type Documentation

enum SatelliteDataRole

Description of the data roles used in SatellitesListModel.

Definition at line 51 of file Satellite.hpp.

enum SatFlag

Flag type reflecting internal flags of Satellite.

Definition at line 66 of file Satellite.hpp.

Function Documentation

double AcTan	(	double	sinx,
		double	cosx
	)

Four-quadrant arctan function.

double Sqr

(

double

arg

)

Returns square of a double.