org.orekit.forces.gravity.tides
Class TidesToolbox

java.lang.Object
  org.orekit.forces.gravity.tides.TidesToolbox

public final class TidesToolbox
extends Object

Tides toolbox

Since:

2.1

Version:

$$

Author:

Rami Houdroge

Concurrency :

immutable

Method Summary

static double[][]	computeFundamentalArguments(AbsoluteDate date, TidesStandards.TidesStandard standard) Method to compute the Doodson fundamental arguments.
static double[][]	computeNutationArguments(double jd, TidesStandards.TidesStandard standard) Method to compute the fundamental arguments from the luni-solar nutation theory.
static int[]	nDoodson(double doodsonNumber) Doodson number decomposition as a sextuplet of integers.

Methods inherited from class java.lang.Object

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

Method Detail

nDoodson

public static int[] nDoodson(double doodsonNumber)

Doodson number decomposition as a sextuplet of integers. The six small integers multipliers encode the frequency of the tidal argument concerned and form the Doodson numbers: in practice all except the first are usually biased upwards by +5 to avoid negative numbers in the notation. (In the case that the biased multiple exceeds 9, the system adopts X for 10, and E for 11.) For example, the Doodson number 273.555 means that the tidal frequency is composed of twice the first Doodson argument, +2 times the second, -2 times the third and zero times each of the other three. See http://en.wikipedia.org/wiki/Arthur_Thomas_Doodson

Parameters:

doodsonNumber - : Doodson number (xxx.xxx)

Returns:

Doodson sextuplet

Additional comments :

see obelixutil.f90 : function nDoodson(nonde)

computeFundamentalArguments

public static double[][] computeFundamentalArguments(AbsoluteDate date,
                                                     TidesStandards.TidesStandard standard)
                                              throws OrekitException

Method to compute the Doodson fundamental arguments.

Parameters:

date - the considered absolute date

standard - the tides standard to use

Returns:

a table of the nutation arguments

Throws:

OrekitException - when an Orekit error occurs

Additional comments :

see OBELIX library: module mc_argfond.f90/subroutine orc_argfond_doodson

computeNutationArguments

public static double[][] computeNutationArguments(double jd,
                                                  TidesStandards.TidesStandard standard)

Method to compute the fundamental arguments from the luni-solar nutation theory.

Parameters:

jd - duration from the J2000 epoch to the given date with TT scale in julian days

standard - the tides standard to use

Returns:

a table of the nutation arguments and their first and second derivatives in columns

Additional comments :

see OBELIX library : module mc_argfond.f90/subroutine orc_argfond_nutls