org.orekit.propagation.semianalytical.dsst.utilities

Class GHmsjPolynomials

java.lang.Object

org.orekit.propagation.semianalytical.dsst.utilities.GHmsjPolynomials

public class GHmsjPolynomials
extends Object

Compute the G_ms^j and the H_ms^j polynomials in the equinoctial elements h, k and the direction cosines α and β and their partial derivatives with respect to k, h, α and β.

The expressions used are equations 2.7.5-(1)(2) from the Danielson paper.

Author:

Romain Di Costanzo

Constructor Summary

Constructors

Constructor and Description
GHmsjPolynomials(double k, double h, double alpha, double beta, int retroFactor) Create a set of Gmsj and Hmsj polynomials.

Method Summary

Modifier and Type	Method and Description
double	getdGmsdAlpha(int m, int s, int j) Get the dGmsj / dα coefficient.
double	getdGmsdBeta(int m, int s, int j) Get the dGmsj / dβ coefficient.
double	getdGmsdh(int m, int s, int j) Get the dGmsj / dh coefficient.
double	getdGmsdk(int m, int s, int j) Get the dGmsj / dk coefficient.
double	getdHmsdAlpha(int m, int s, int j) Get the dHmsj / dα coefficient.
double	getdHmsdBeta(int m, int s, int j) Get the dHmsj / dβ coefficient.
double	getdHmsdh(int m, int s, int j) Get the dHmsj / dh coefficient.
double	getdHmsdk(int m, int s, int j) Get the dHmsj / dk coefficient.
double	getGmsj(int m, int s, int j) Get the Gmsj coefficient.
double	getHmsj(int m, int s, int j) Get the Hmsj coefficient.

Methods inherited from class java.lang.Object

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

Constructor Detail

GHmsjPolynomials

public GHmsjPolynomials(double k,
                        double h,
                        double alpha,
                        double beta,
                        int retroFactor)

Create a set of G_ms^j and H_ms^j polynomials.

Parameters:

k - X component of the eccentricity vector

h - Y component of the eccentricity vector

alpha - direction cosine α

beta - direction cosine β

retroFactor - -1 if the orbit is represented as retrograde, +1 otherwise

Method Detail

getGmsj

public double getGmsj(int m,
                      int s,
                      int j)

Get the G_ms^j coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

the G_ms^j

getHmsj

public double getHmsj(int m,
                      int s,
                      int j)

Get the H_ms^j coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

the H_ms^j

getdGmsdk

public double getdGmsdk(int m,
                        int s,
                        int j)

Get the dG_ms^j / d_k coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

dG_ms^j / d_k

getdGmsdh

public double getdGmsdh(int m,
                        int s,
                        int j)

Get the dG_ms^j / d_h coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

dG_ms^j / d_h

getdGmsdAlpha

public double getdGmsdAlpha(int m,
                            int s,
                            int j)

Get the dG_ms^j / d_α coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

dG_ms^j / d_α

getdGmsdBeta

public double getdGmsdBeta(int m,
                           int s,
                           int j)

Get the dG_ms^j / d_β coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

dG_ms^j / d_β

getdHmsdk

public double getdHmsdk(int m,
                        int s,
                        int j)

Get the dH_ms^j / d_k coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

dH_ms^j / d_k

getdHmsdh

public double getdHmsdh(int m,
                        int s,
                        int j)

Get the dH_ms^j / d_h coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

dH_ms^j / d_h

getdHmsdAlpha

public double getdHmsdAlpha(int m,
                            int s,
                            int j)

Get the dH_ms^j / d_α coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

dH_ms^j / d_α

getdHmsdBeta

public double getdHmsdBeta(int m,
                           int s,
                           int j)

Get the dH_ms^j / d_β coefficient.

Parameters:

m - m subscript

s - s subscript

j - order

Returns:

dH_ms^j / d_β