org.orekit.estimation.iod

Class IodGooding

java.lang.Object

org.orekit.estimation.iod.IodGooding

public class IodGooding
extends Object

Gooding angles only initial orbit determination, assuming Keplerian motion. An orbit is determined from three angular observations. Reference: Gooding, R.H., A New Procedure for Orbit Determination Based on Three Lines of Sight (Angles only), Technical Report 93004, April 1993

Since:

8.0

Author:

Joris Olympio

Constructor Summary

Constructors

Constructor and Description
IodGooding(Frame frame, double mu) Creator.

Method Summary

Modifier and Type	Method and Description
KeplerianOrbit	estimate(Vector3D O1, Vector3D O2, Vector3D O3, Vector3D lineOfSight1, AbsoluteDate dateObs1, Vector3D lineOfSight2, AbsoluteDate dateObs2, Vector3D lineOfSight3, AbsoluteDate dateObs3, double rho1init, double rho3init) Orbit got from Observed Three Lines of Sight (angles only).
KeplerianOrbit	estimate(Vector3D O1, Vector3D O2, Vector3D O3, Vector3D lineOfSight1, AbsoluteDate dateObs1, Vector3D lineOfSight2, AbsoluteDate dateObs2, Vector3D lineOfSight3, AbsoluteDate dateObs3, double rho1init, double rho3init, int nRev, boolean direction) Orbit got from Observed Three Lines of Sight (angles only).
double	getRange1() Get the range for observation (1).
double	getRange2() Get the range for observation (2).
double	getRange3() Get the range for observation (3).

Methods inherited from class java.lang.Object

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

Constructor Detail

IodGooding

public IodGooding(Frame frame,
                  double mu)

Creator.

Parameters:

frame - Frame for the observations

mu - gravitational constant

Method Detail

getRange1

public double getRange1()

Get the range for observation (1).

Returns:

the range for observation (1).

getRange2

public double getRange2()

Get the range for observation (2).

Returns:

the range for observation (2).

getRange3

public double getRange3()

Get the range for observation (3).

Returns:

the range for observation (3).

estimate

public KeplerianOrbit estimate(Vector3D O1,
                               Vector3D O2,
                               Vector3D O3,
                               Vector3D lineOfSight1,
                               AbsoluteDate dateObs1,
                               Vector3D lineOfSight2,
                               AbsoluteDate dateObs2,
                               Vector3D lineOfSight3,
                               AbsoluteDate dateObs3,
                               double rho1init,
                               double rho3init,
                               int nRev,
                               boolean direction)

Orbit got from Observed Three Lines of Sight (angles only).

Parameters:

O1 - Observer position 1

O2 - Observer position 2

O3 - Observer position 3

lineOfSight1 - line of sight 1

dateObs1 - date of observation 1

lineOfSight2 - line of sight 2

dateObs2 - date of observation 2

lineOfSight3 - line of sight 3

dateObs3 - date of observation 3

rho1init - initial guess of the range problem. range 1, in meters

rho3init - initial guess of the range problem. range 3, in meters

nRev - number of complete revolutions between observation1 and 3

direction - true if posigrade (short way)

Returns:

an estimate of the Keplerian orbit

estimate

public KeplerianOrbit estimate(Vector3D O1,
                               Vector3D O2,
                               Vector3D O3,
                               Vector3D lineOfSight1,
                               AbsoluteDate dateObs1,
                               Vector3D lineOfSight2,
                               AbsoluteDate dateObs2,
                               Vector3D lineOfSight3,
                               AbsoluteDate dateObs3,
                               double rho1init,
                               double rho3init)

Orbit got from Observed Three Lines of Sight (angles only). assuming there was less than an half revolution between start and final date

Parameters:

O1 - Observer position 1

O2 - Observer position 2

O3 - Observer position 3

lineOfSight1 - line of sight 1

dateObs1 - date of observation 1

lineOfSight2 - line of sight 2

dateObs2 - date of observation 1

lineOfSight3 - line of sight 3

dateObs3 - date of observation 1

rho1init - initial guess of the range problem. range 1, in meters

rho3init - initial guess of the range problem. range 3, in meters

Returns:

an estimate of the Keplerian orbit