fr.cnes.sirius.patrius.stela.bodies

Class GeodPosition

java.lang.Object

fr.cnes.sirius.patrius.stela.bodies.GeodPosition

public final class GeodPosition
extends Object

Class representing the geodetic representation of a position.
It is used to compute the spacecraft geodetic latitude when computing the atmospheric drag acceleration.

Since:

1.3

Version:

$Id$

Author:

Vincent Ruch, Tiziana Sabatini

See Also:

StelaAeroModel

Concurrency :

immutable

Constructor Summary

Constructors

Constructor and Description
GeodPosition(double rEq, double f) Constructor

Method Summary

Modifier and Type	Method and Description
double	getGeodeticAltitude(Vector3D position) Compute geodetic altitude.
double	getGeodeticLatitude(Vector3D position) Compute geodetic latitude.
double	getGeodeticLongitude(Vector3D position, AbsoluteDate date) Compute the geodetic longitude at a given date.
double	getTloc(Vector3D position, Vector3D positionSun, AbsoluteDate date) Compute the local solar time at a given date.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GeodPosition

public GeodPosition(double rEq,
                    double f)

Constructor

Parameters:

rEq - the Earth radius

f - the Earth flattening

Method Detail

getGeodeticAltitude

public double getGeodeticAltitude(Vector3D position)
                           throws PatriusException

Compute geodetic altitude.

Parameters:

position - the spacecraft position

Returns:

the geodetic altitude (m)

Throws:

PatriusException - Exception raised if :

• geocentric latitude is Infinite or NaN
• geodetic altitude cannot be compute
• the algorithm does not converge after the max authorised number of iterations

getGeodeticLatitude

public double getGeodeticLatitude(Vector3D position)
                           throws PatriusException

Compute geodetic latitude.

Parameters:

position - the spacecraft position

Returns:

the geodetic latitude (rad)

Throws:

PatriusException - exception raised if :

• geocentric latitude is Infinite or NaN
• geodetic altitude cannot be compute
• the algorithm does not converge after the max authorised number of iterations

getGeodeticLongitude

public double getGeodeticLongitude(Vector3D position,
                                   AbsoluteDate date)
                            throws PatriusException

Compute the geodetic longitude at a given date.

Parameters:

position - the spacecraft position

date - the date

Returns:

the geodetic longitude (rad)

Throws:

PatriusException - error in the GMST computation

getTloc

public double getTloc(Vector3D position,
                      Vector3D positionSun,
                      AbsoluteDate date)

Compute the local solar time at a given date.

Parameters:

position - the spacecraft position

positionSun - the Sun position

date - the date

Returns:

the local solar time