org.orekit.estimation.iod

Class IodLambert

java.lang.Object

org.orekit.estimation.iod.IodLambert

public class IodLambert
extends Object

Lambert initial orbit determination, assuming Keplerian motion. An orbit is determined from two position vectors. References: Battin, R.H., An Introduction to the Mathematics and Methods of Astrodynamics, AIAA Education, 1999. Lancaster, E.R. and Blanchard, R.C., A Unified Form of Lambert’s Theorem, Goddard Space Flight Center, 1968.

Since:

8.0

Author:

Joris Olympio

Constructor Summary

Constructors

Constructor and Description
IodLambert(double mu) Creator.

Method Summary

Modifier and Type	Method and Description
KeplerianOrbit	estimate(Frame frame, boolean posigrade, int nRev, Vector3D P1, AbsoluteDate T1, Vector3D P2, AbsoluteDate T2) Estimate an keplerian orbit given two position vector and a duration.
boolean	solveLambertPb(double r1, double r2, double dth, double tau, int mRev, double[] V1) Lambert's solver.

Methods inherited from class java.lang.Object

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

Constructor Detail

IodLambert

public IodLambert(double mu)

Creator.

Parameters:

mu - gravitational constant

Method Detail

estimate

public KeplerianOrbit estimate(Frame frame,
                               boolean posigrade,
                               int nRev,
                               Vector3D P1,
                               AbsoluteDate T1,
                               Vector3D P2,
                               AbsoluteDate T2)

Estimate an keplerian orbit given two position vector and a duration.

Parameters:

frame - frame

posigrade - flag indicating the direction of motion

nRev - number of revolutions

P1 - position vector 1

T1 - date of observation 1

P2 - position vector 2

T2 - date of observation 2

Returns:

an initial keplerian orbit estimate

solveLambertPb

public boolean solveLambertPb(double r1,
                              double r2,
                              double dth,
                              double tau,
                              int mRev,
                              double[] V1)

Lambert's solver. Assume mu=1.

Parameters:

r1 - radius 1

r2 - radius 2

dth - sweep angle

tau - time of flight

mRev - number of revs

V1 - velocity at departure in (T,N) basis

Returns:

something