org.orekit.propagation.semianalytical.dsst.utilities

Class NewcombOperators

java.lang.Object

org.orekit.propagation.semianalytical.dsst.utilities.NewcombOperators

public class NewcombOperators
extends Object

Implementation of the Modified Newcomb Operators.

From equations 2.7.3 - (12)(13) of the Danielson paper, those operators are defined as:

4(ρ + σ)Y_ρ,σ^n,s =
2(2s - n)Y_ρ-1,σ^n,s+1 + (s - n)Y_ρ-2,σ^n,s+2
- 2(2s + n)Y_ρ,σ-1^n,s-1 - (s+n)Y_ρ,σ-2^n,s-2
+ 2(2ρ + 2σ + 2 + 3n)Y_ρ-1,σ-1^n,s

Initialization is given by : Y_0,0^n,s = 1

Internally, the Modified Newcomb Operators are stored as an array of PolynomialFunction :

Y_ρ,σ^n,s = P_k0 + P_k1n + ... + P_kjn^j

where the P_kj are given by

P_kj = ∑_j=0;ρ a_js^j

Author:

Romain Di Costanzo, Pascal Parraud

Method Summary

Modifier and Type	Method and Description
static double	getValue(int rho, int sigma, int n, int s) Get the Newcomb operator evaluated at n, s, ρ, σ.

Methods inherited from class java.lang.Object

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

Method Detail

getValue

public static double getValue(int rho,
                              int sigma,
                              int n,
                              int s)

Get the Newcomb operator evaluated at n, s, ρ, σ.

This method is guaranteed to be thread-safe

Parameters:

rho - ρ index

sigma - σ index

n - n index

s - s index

Returns:

Y_ρ,σ^n,s