RTNCovariance.java

  1. /* Copyright 2002-2025 CS GROUP
  2.  * Licensed to CS GROUP (CS) under one or more
  3.  * contributor license agreements.  See the NOTICE file distributed with
  4.  * this work for additional information regarding copyright ownership.
  5.  * CS licenses this file to You under the Apache License, Version 2.0
  6.  * (the "License"); you may not use this file except in compliance with
  7.  * the License.  You may obtain a copy of the License at
  8.  *
  9.  *   http://www.apache.org/licenses/LICENSE-2.0
  10.  *
  11.  * Unless required by applicable law or agreed to in writing, software
  12.  * distributed under the License is distributed on an "AS IS" BASIS,
  13.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14.  * See the License for the specific language governing permissions and
  15.  * limitations under the License.
  16.  */
  17. package org.orekit.files.ccsds.ndm.cdm;

  19. import org.hipparchus.linear.MatrixUtils;
  20. import org.hipparchus.linear.RealMatrix;
  21. import org.orekit.files.ccsds.section.CommentsContainer;

  23. /**
  24.  * Container for RTN covariance matrix data.
  25.  * <p>
  26.  * Beware that the Orekit getters and setters all rely on SI units. The parsers
  27.  * and writers take care of converting these SI units into CCSDS mandatory units.
  28.  * The {@link org.orekit.utils.units.Unit Unit} class provides useful
  29.  * {@link org.orekit.utils.units.Unit#fromSI(double) fromSi} and
  30.  * {@link org.orekit.utils.units.Unit#toSI(double) toSI} methods in case the callers
  31.  * already use CCSDS units instead of the API SI units. The general-purpose
  32.  * {@link org.orekit.utils.units.Unit Unit} class (without an 's') and the
  33.  * CCSDS-specific {@link org.orekit.files.ccsds.definitions.Units Units} class
  34.  * (with an 's') also provide some predefined units. These predefined units and the
  35.  * {@link org.orekit.utils.units.Unit#fromSI(double) fromSi} and
  36.  * {@link org.orekit.utils.units.Unit#toSI(double) toSI} conversion methods are indeed
  37.  * what the parsers and writers use for the conversions.
  38.  * </p>
  39.  * <p>
  40.  * This class has a RealMatrix as attribute which can be access with
  41.  * {@code getRTNCovariaxMatrix} method. Beware that there are thus two
  42.  * ways to modify the RTN covariance : {@code setC…} ({@code setCrr},
  43.  * {@code setCtr}…) which should be prioritized and
  44.  * {@code getRTNCovariaxMatrix.setEntry(row, col, value)}.
  45.  * </p>
  46.  * <p>
  47.  * The RTN Covariance Matrix is provided in the 9×9 Lower Triangular Form. All parameters
  48.  * of the 6×6 position/velocity submatrix are mandatory. The remaining elements will return
  49.  * {code NaN} if not provided.
  50.  * </p>
  51.  * @author Melina Vanel
  52.  * @since 11.2
  53.  */
  54. public class RTNCovariance extends CommentsContainer {

  56.     /** RTN covariance matrix. */
  57.     private final RealMatrix covarianceMatrix;

  59.     /** Simple constructor. To update matrix value there are 2 ways to modify the RTN
  60.      * covariance : setC... ( setCrr, setCtr ...) which should be prioritized and
  61.      * getRTNCovariaxMatrix.setEntry(row, col, value).
  62.      * <p> The RTN Covariance Matrix is provided in the 9×9 Lower Triangular Form. All parameters of the 6×6 position/velocity submatrix
  63.      * are mandatory. The remaining elements will return NaN if not provided. </p>
  64.      */
  65.     public RTNCovariance() {
  66.         covarianceMatrix = MatrixUtils.createRealMatrix(9, 9);
  67.         for (int i = 0; i < covarianceMatrix.getRowDimension(); ++i) {
  68.             for (int j = 0; j <= i; ++j) {
  69.                 covarianceMatrix.setEntry(i, j, Double.NaN);
  70.             }
  71.         }

  73.     }

  75.     /** {@inheritDoc} */
  76.     @Override
  77.     public void validate(final double version) {
  78.         super.validate(version);
  79.         // We only check values that are mandatory in a cdm file
  80.         checkNotNaN(getCrr(),              RTNCovarianceKey.CR_R.name());
  81.         checkNotNaN(getCtr(),              RTNCovarianceKey.CT_R.name());
  82.         checkNotNaN(getCtt(),              RTNCovarianceKey.CT_T.name());
  83.         checkNotNaN(getCnr(),              RTNCovarianceKey.CN_R.name());
  84.         checkNotNaN(getCnt(),              RTNCovarianceKey.CN_T.name());
  85.         checkNotNaN(getCnn(),              RTNCovarianceKey.CN_N.name());
  86.         checkNotNaN(getCrdotr(),           RTNCovarianceKey.CRDOT_R.name());
  87.         checkNotNaN(getCrdott(),           RTNCovarianceKey.CRDOT_T.name());
  88.         checkNotNaN(getCrdotn(),           RTNCovarianceKey.CRDOT_N.name());
  89.         checkNotNaN(getCrdotrdot(),        RTNCovarianceKey.CRDOT_RDOT.name());
  90.         checkNotNaN(getCtdotr(),           RTNCovarianceKey.CTDOT_R.name());
  91.         checkNotNaN(getCtdott(),           RTNCovarianceKey.CTDOT_T.name());
  92.         checkNotNaN(getCtdotn(),           RTNCovarianceKey.CTDOT_N.name());
  93.         checkNotNaN(getCtdotrdot(),        RTNCovarianceKey.CTDOT_RDOT.name());
  94.         checkNotNaN(getCtdottdot(),        RTNCovarianceKey.CTDOT_TDOT.name());
  95.         checkNotNaN(getCndotr(),           RTNCovarianceKey.CNDOT_R.name());
  96.         checkNotNaN(getCndott(),           RTNCovarianceKey.CNDOT_T.name());
  97.         checkNotNaN(getCndotn(),           RTNCovarianceKey.CNDOT_N.name());
  98.         checkNotNaN(getCndotrdot(),        RTNCovarianceKey.CNDOT_RDOT.name());
  99.         checkNotNaN(getCndottdot(),        RTNCovarianceKey.CNDOT_TDOT.name());
  100.         checkNotNaN(getCndotndot(),        RTNCovarianceKey.CNDOT_NDOT.name());
  101.     }

  103.     /** Set an entry in the RTN covariance matrix.
  104.      * <p>
  105.      * Both m(j, k) and m(k, j) are set.
  106.      * </p>
  107.      * @param j row index (must be between 0 and 5 (inclusive)
  108.      * @param k column index (must be between 0 and 5 (inclusive)
  109.      * @param entry value of the matrix entry
  110.      */
  111.     public void setCovarianceMatrixEntry(final int j, final int k, final double entry) {
  112.         covarianceMatrix.setEntry(j, k, entry);
  113.         covarianceMatrix.setEntry(k, j, entry);
  114.     }

  116.     /**
  117.      * Get the RTN covariance matrix.
  118.      * <p> The RTN Covariance Matrix is provided in the 9×9 Lower Triangular Form. All parameters of the 6×6 position/velocity submatrix
  119.      * are mandatory. The remaining elements will return NaN if not provided. </p>
  120.      * @return the RTN covariance matrix
  121.      */
  122.     public RealMatrix getRTNCovarianceMatrix() {
  123.         return covarianceMatrix;
  124.     }

  126.     /**
  127.      * Get the object [1,1] in covariance matrix (with index starting at 1).
  128.      * @return the object [1,1] in covariance matrix (in m²)
  129.      */
  130.     public double getCrr() {
  131.         return covarianceMatrix.getEntry(0, 0);
  132.     }

  134.     /**
  135.      * Set the object [1,1] in covariance matrix (with index starting at 1).
  136.      * @param CRR = object [1,1] in covariance matrix (in m²)
  137.      */
  138.     public void setCrr(final double CRR) {
  139.         refuseFurtherComments();
  140.         setCovarianceMatrixEntry(0, 0, CRR);
  141.     }

  143.     /**
  144.      * Get the object [2,1] in covariance matrix (with index starting at 1).
  145.      * @return the object [2,1] in covariance matrix (in m²)
  146.      */
  147.     public double getCtr() {
  148.         return covarianceMatrix.getEntry(1, 0);
  149.     }

  151.     /**
  152.      * Set the object [2,1] in covariance matrix (with index starting at 1).
  153.      * @param CTR = object [2,1] in covariance matrix (in m²)
  154.      */
  155.     public void setCtr(final double CTR) {
  156.         refuseFurtherComments();
  157.         setCovarianceMatrixEntry(1, 0, CTR);
  158.     }

  160.     /**
  161.      * Get the object [2,2] in covariance matrix (with index starting at 1).
  162.      * @return the object [2,2] in covariance matrix (in m²)
  163.      */
  164.     public double getCtt() {
  165.         return covarianceMatrix.getEntry(1, 1);
  166.     }

  168.     /**
  169.      * Set the object [2,2] in covariance matrix (with index starting at 1).
  170.      * @param CTT = object [2,2] in covariance matrix (in m²)
  171.      */
  172.     public void setCtt(final double CTT) {
  173.         refuseFurtherComments();
  174.         setCovarianceMatrixEntry(1, 1, CTT);
  175.     }

  177.     /**
  178.      * Get the object [3,1] in covariance matrix (with index starting at 1).
  179.      * @return the object [3,1] in covariance matrix (in m²)
  180.      */
  181.     public double getCnr() {
  182.         return covarianceMatrix.getEntry(2, 0);
  183.     }

  185.     /**
  186.      * Set the object [3,1] in covariance matrix (with index starting at 1).
  187.      * @param CNR = object [3,1] in covariance matrix (in m²)
  188.      */
  189.     public void setCnr(final double CNR) {
  190.         refuseFurtherComments();
  191.         setCovarianceMatrixEntry(2, 0, CNR);
  192.     }

  194.     /**
  195.      * Get the object [3,2] in covariance matrix (with index starting at 1).
  196.      * @return the object [3,2] in covariance matrix (in m²)
  197.      */
  198.     public double getCnt() {
  199.         return covarianceMatrix.getEntry(2, 1);
  200.     }

  202.     /**
  203.      * Set the object [3,2] in covariance matrix (with index starting at 1).
  204.      * @param CNT = object [3,2] in covariance matrix (in m²)
  205.      */
  206.     public void setCnt(final double CNT) {
  207.         refuseFurtherComments();
  208.         setCovarianceMatrixEntry(2, 1, CNT);
  209.     }

  211.     /**
  212.      * Get the object [3,3] in covariance matrix (with index starting at 1).
  213.      * @return the object [3,3] in covariance matrix (in m²)
  214.      */
  215.     public double getCnn() {
  216.         return covarianceMatrix.getEntry(2, 2);
  217.     }

  219.     /**
  220.      * Set the object [3,3] in covariance matrix (with index starting at 1).
  221.      * @param CNN = object [3,3] in covariance matrix (in m²)
  222.      */
  223.     public void setCnn(final double CNN) {
  224.         refuseFurtherComments();
  225.         setCovarianceMatrixEntry(2, 2, CNN);
  226.     }

  228.     /**
  229.      * Get the object [4,1] in covariance matrix (with index starting at 1).
  230.      * @return the object [4,1] in covariance matrix (in m²/s)
  231.      */
  232.     public double getCrdotr() {
  233.         return covarianceMatrix.getEntry(3, 0);
  234.     }

  236.     /**
  237.      * Set the object [4,1] in covariance matrix (with index starting at 1).
  238.      * @param CRdotR = object [4,1] in covariance matrix (in m²/s)
  239.      */
  240.     public void setCrdotr(final double CRdotR) {
  241.         refuseFurtherComments();
  242.         setCovarianceMatrixEntry(3, 0, CRdotR);
  243.     }

  245.     /**
  246.      * Get the object [4,2] in covariance matrix (with index starting at 1).
  247.      * @return the object [4,2] in covariance matrix (in m²/s)
  248.      */
  249.     public double getCrdott() {
  250.         return covarianceMatrix.getEntry(3, 1);
  251.     }

  253.     /**
  254.      * Set the object [4, 2] in covariance matrix (with index starting at 1).
  255.      * @param CRdotT = object [4, 2] in covariance matrix (in m²/s)
  256.      */
  257.     public void setCrdott(final double CRdotT) {
  258.         refuseFurtherComments();
  259.         setCovarianceMatrixEntry(3, 1, CRdotT);
  260.     }

  262.     /**
  263.      * Get the object [4, 3] in covariance matrix (with index starting at 1) .
  264.      * @return the object [4, 3] in covariance matrix (in m²/s)
  265.      */
  266.     public double getCrdotn() {
  267.         return covarianceMatrix.getEntry(3, 2);
  268.     }

  270.     /**
  271.      * Set the object [4, 3] in covariance matrix (with index starting at 1).
  272.      * @param CRdotN = object [4,3] in covariance matrix (in m²/s)
  273.      */
  274.     public void setCrdotn(final double CRdotN) {
  275.         refuseFurtherComments();
  276.         setCovarianceMatrixEntry(3, 2, CRdotN);
  277.     }

  279.     /**
  280.      * Get the object [4, 4] in covariance matrix (with index starting at 1).
  281.      * @return the object [4, 4] in covariance matrix (in m²/s²)
  282.      */
  283.     public double getCrdotrdot() {
  284.         return covarianceMatrix.getEntry(3, 3);
  285.     }

  287.     /**
  288.      * Set the object [4, 4] in covariance matrix (with index starting at 1).
  289.      * @param CRdotRdot = object [4, 4] in covariance matrix (in m²/s²)
  290.      */
  291.     public void setCrdotrdot(final double CRdotRdot) {
  292.         refuseFurtherComments();
  293.         setCovarianceMatrixEntry(3, 3, CRdotRdot);
  294.     }

  296.     /**
  297.      * Get the object [5, 1] in covariance matrix (with index starting at 1).
  298.      * @return the object [5, 1] in covariance matrix (in m²/s)
  299.      */
  300.     public double getCtdotr() {
  301.         return covarianceMatrix.getEntry(4, 0);
  302.     }

  304.     /**
  305.      * Set the object [5,1] in covariance matrix (with index starting at 1).
  306.      * @param CTdotR = object [5,1] in covariance matrix (in m²/s)
  307.      */
  308.     public void setCtdotr(final double CTdotR) {
  309.         refuseFurtherComments();
  310.         setCovarianceMatrixEntry(4, 0, CTdotR);
  311.     }

  313.     /**
  314.      * Get the object [5,2] in covariance matrix (with index starting at 1).
  315.      * @return the object [5,2] in covariance matrix (in m²/s)
  316.      */
  317.     public double getCtdott() {
  318.         return covarianceMatrix.getEntry(4, 1);
  319.     }

  321.     /**
  322.      * Set the object [5,2] in covariance matrix (with index starting at 1).
  323.      * @param CTdotT = object [5,2] in covariance matrix (in m²/s)
  324.      */
  325.     public void setCtdott(final double CTdotT) {
  326.         refuseFurtherComments();
  327.         setCovarianceMatrixEntry(4, 1, CTdotT);
  328.     }

  330.     /**
  331.      * Get the object [5,3] in covariance matrix (with index starting at 1).
  332.      * @return the object [5,3] in covariance matrix (in m²/s)
  333.      */
  334.     public double getCtdotn() {
  335.         return covarianceMatrix.getEntry(4, 2);
  336.     }

  338.     /**
  339.      * Set the object [5,3] in covariance matrix (with index starting at 1).
  340.      * @param CTdotN = object [5,3] in covariance matrix (in m²/s)
  341.      */
  342.     public void setCtdotn(final double CTdotN) {
  343.         refuseFurtherComments();
  344.         setCovarianceMatrixEntry(4, 2, CTdotN);
  345.     }

  347.     /**
  348.      * Get the object [5,4] in covariance matrix (with index starting at 1).
  349.      * @return the object [5,4] in covariance matrix (in m²/s²)
  350.      */
  351.     public double getCtdotrdot() {
  352.         return covarianceMatrix.getEntry(4, 3);
  353.     }

  355.     /**
  356.      * Set the object [5,4] in covariance matrix (with index starting at 1).
  357.      * @param CTdotRdot = object [5,4] in covariance matrix (in m²/s²)
  358.      */
  359.     public void setCtdotrdot(final double CTdotRdot) {
  360.         refuseFurtherComments();
  361.         setCovarianceMatrixEntry(4, 3, CTdotRdot);
  362.     }

  364.     /**
  365.      * Get the object [5,5] in covariance matrix (with index starting at 1).
  366.      * @return the object [5,5] in covariance matrix (in m²/s²)
  367.      */
  368.     public double getCtdottdot() {
  369.         return covarianceMatrix.getEntry(4, 4);
  370.     }

  372.     /**
  373.      * Set the object [5,5] in covariance matrix (with index starting at 1).
  374.      * @param CTdotTdot = object [5,5] in covariance matrix (in m²/s²)
  375.      */
  376.     public void setCtdottdot(final double CTdotTdot) {
  377.         refuseFurtherComments();
  378.         setCovarianceMatrixEntry(4, 4, CTdotTdot);
  379.     }

  381.     /**
  382.      * Get the object [6,1] in covariance matrix (with index starting at 1).
  383.      * @return the object [6,1] in covariance matrix (in m²/s)
  384.      */
  385.     public double getCndotr() {
  386.         return covarianceMatrix.getEntry(5, 0);
  387.     }

  389.     /**
  390.      * Set the object [6,1] in covariance matrix (with index starting at 1).
  391.      * @param CNdotR = object [6,1] in covariance matrix (in m²/s)
  392.      */
  393.     public void setCndotr(final double CNdotR) {
  394.         refuseFurtherComments();
  395.         setCovarianceMatrixEntry(5, 0, CNdotR);
  396.     }

  398.     /**
  399.      * Get the object [6,2] in covariance matrix (with index starting at 1).
  400.      * @return the object [6,2] in covariance matrix (in m²/s)
  401.      */
  402.     public double getCndott() {
  403.         return covarianceMatrix.getEntry(5, 1);
  404.     }

  406.     /**
  407.      * Set the object [6,2] in covariance matrix (with index starting at 1).
  408.      * @param CNdotT = object [6,2] in covariance matrix (in m²/s)
  409.      */
  410.     public void setCndott(final double CNdotT) {
  411.         refuseFurtherComments();
  412.         setCovarianceMatrixEntry(5, 1, CNdotT);
  413.     }

  415.     /**
  416.      * Get the object [6,3] in covariance matrix (with index starting at 1).
  417.      * @return the object [6,3] in covariance matrix (in m²/s)
  418.      */
  419.     public double getCndotn() {
  420.         return covarianceMatrix.getEntry(5, 2);
  421.     }

  423.     /**
  424.      * Set the object [6,3] in covariance matrix (with index starting at 1).
  425.      * @param CNdotN = object [6,3] in covariance matrix (in m²/s)
  426.      */
  427.     public void setCndotn(final double CNdotN) {
  428.         refuseFurtherComments();
  429.         setCovarianceMatrixEntry(5, 2, CNdotN);
  430.     }

  432.     /**
  433.      * Get the object [6,4] in covariance matrix (with index starting at 1).
  434.      * @return the object [6,4] in covariance matrix (in m²/s²)
  435.      */
  436.     public double getCndotrdot() {
  437.         return covarianceMatrix.getEntry(5, 3);
  438.     }

  440.     /**
  441.      * Set the object [6,4] in covariance matrix (with index starting at 1).
  442.      * @param CNdotRdot = object [6,4] in covariance matrix (in m²/s²)
  443.      */
  444.     public void setCndotrdot(final double CNdotRdot) {
  445.         refuseFurtherComments();
  446.         setCovarianceMatrixEntry(5, 3, CNdotRdot);
  447.     }

  449.     /**
  450.      * Get the object [6,5] in covariance matrix (with index starting at 1).
  451.      * @return the object [6,5] in covariance matrix (in m²/s²)
  452.      */
  453.     public double getCndottdot() {
  454.         return covarianceMatrix.getEntry(5, 4);
  455.     }

  457.     /**
  458.      * Set the object [6,5] in covariance matrix (with index starting at 1).
  459.      * @param CNdotTdot = object [6,5] in covariance matrix (in m²/s²)
  460.      */
  461.     public void setCndottdot(final double CNdotTdot) {
  462.         refuseFurtherComments();
  463.         setCovarianceMatrixEntry(5, 4, CNdotTdot);
  464.     }

  466.     /**
  467.      * Get the object [6,6] in covariance matrix (with index starting at 1).
  468.      * @return the object [6,6] in covariance matrix (in m²/s²)
  469.      */
  470.     public double getCndotndot() {
  471.         return covarianceMatrix.getEntry(5, 5);
  472.     }

  474.     /**
  475.      * Set the object [6,6] in covariance matrix (with index starting at 1).
  476.      * @param CNdotNdot = object [6,6] in covariance matrix (in m²/s²)
  477.      */
  478.     public void setCndotndot(final double CNdotNdot) {
  479.         refuseFurtherComments();
  480.         setCovarianceMatrixEntry(5, 5, CNdotNdot);
  481.     }

  483.     /**
  484.      * Get the object [7,1] in covariance matrix (with index starting at 1).
  485.      * @return the object [7,1] in covariance matrix (in m³/kg)
  486.      */
  487.     public double getCdrgr() {
  488.         return covarianceMatrix.getEntry(6, 0);
  489.     }

  491.     /**
  492.      * Set the object [7,1] in covariance matrix (with index starting at 1).
  493.      * @param CDRGR = object [7,1] in covariance matrix (in m³/kg)
  494.      */
  495.     public void setCdrgr(final double CDRGR) {
  496.         refuseFurtherComments();
  497.         setCovarianceMatrixEntry(6, 0, CDRGR);
  498.     }

  500.     /**
  501.      * Get the object [7,2] in covariance matrix.
  502.      * @return the object [7,2] in covariance matrix (in m³/kg)
  503.      */
  504.     public double getCdrgt() {
  505.         return covarianceMatrix.getEntry(6, 1);
  506.     }

  508.     /**
  509.      * Set the object [7,2] in covariance matrix (with index starting at 1).
  510.      * @param CDRGT = object [7,2] in covariance matrix (in m³/kg)
  511.      */
  512.     public void setCdrgt(final double CDRGT) {
  513.         refuseFurtherComments();
  514.         setCovarianceMatrixEntry(6, 1, CDRGT);
  515.     }

  517.     /**
  518.      * Get the object [7,3] in covariance matrix (with index starting at 1).
  519.      * @return the object [7,3] in covariance matrix (in m³/kg)
  520.      */
  521.     public double getCdrgn() {
  522.         return covarianceMatrix.getEntry(6, 2);
  523.     }

  525.     /**
  526.      * Set the object [7,3] in covariance matrix (with index starting at 1).
  527.      * @param CDRGN = object [7,3] in covariance matrix (in m³/kg)
  528.      */
  529.     public void setCdrgn(final double CDRGN) {
  530.         refuseFurtherComments();
  531.         setCovarianceMatrixEntry(6, 2, CDRGN);
  532.     }

  534.     /**
  535.      * Get the object [7,4] in covariance matrix (with index starting at 1).
  536.      * @return the object [7,4] in covariance matrix (in m³/(kg.s))
  537.      */
  538.     public double getCdrgrdot() {
  539.         return covarianceMatrix.getEntry(6, 3);
  540.     }

  542.     /**
  543.      * Set the object [7,4] in covariance matrix (with index starting at 1).
  544.      * @param CDRGRdot = object [7,4] in covariance matrix (in m³/(kg.s))
  545.      */
  546.     public void setCdrgrdot(final double CDRGRdot) {
  547.         refuseFurtherComments();
  548.         setCovarianceMatrixEntry(6, 3, CDRGRdot);
  549.     }

  551.     /**
  552.      * Get the object [7,5] in covariance matrix (with index starting at 1).
  553.      * @return the object [7,5] in covariance matrix (in m³/(kg.s))
  554.      */
  555.     public double getCdrgtdot() {
  556.         return covarianceMatrix.getEntry(6, 4);
  557.     }

  559.     /**
  560.      * Set the object [7,5] in covariance matrix (with index starting at 1).
  561.      * @param CDRGTdot = object [7,5] in covariance matrix (in m³/(kg.s))
  562.      */
  563.     public void setCdrgtdot(final double CDRGTdot) {
  564.         refuseFurtherComments();
  565.         setCovarianceMatrixEntry(6, 4, CDRGTdot);
  566.     }

  568.     /**
  569.      * Get the object [7,6] in covariance matrix (with index starting at 1).
  570.      * @return the object [7,6] in covariance matrix (in m³/(kg.s))
  571.      */
  572.     public double getCdrgndot() {
  573.         return covarianceMatrix.getEntry(6, 5);
  574.     }

  576.     /**
  577.      * Set the object [7,6] in covariance matrix (with index starting at 1).
  578.      * @param CDRGNdot = object [7,6] in covariance matrix (in m³/(kg.s))
  579.      */
  580.     public void setCdrgndot(final double CDRGNdot) {
  581.         refuseFurtherComments();
  582.         setCovarianceMatrixEntry(6, 5, CDRGNdot);
  583.     }

  585.     /**
  586.      * Get the object [7,7] in covariance matrix (with index starting at 1).
  587.      * @return the object [7,7] in covariance matrix (in m⁴/kg²)
  588.      */
  589.     public double getCdrgdrg() {
  590.         return covarianceMatrix.getEntry(6, 6);
  591.     }

  593.     /**
  594.      * Set the object [7,7] in covariance matrix (with index starting at 1).
  595.      * @param CDRGDRG = object [7,7] in covariance matrix (in m⁴/kg²)
  596.      */
  597.     public void setCdrgdrg(final double CDRGDRG) {
  598.         refuseFurtherComments();
  599.         setCovarianceMatrixEntry(6, 6, CDRGDRG);
  600.     }

  602.     /**
  603.      * Get the object [8,1] in covariance matrix (with index starting at 1).
  604.      * @return the object [8,1] in covariance matrix (in m³/kg)
  605.      */
  606.     public double getCsrpr() {
  607.         return covarianceMatrix.getEntry(7, 0);
  608.     }

  610.     /**
  611.      * Set the object [8,1] in covariance matrix (with index starting at 1).
  612.      * @param CSRPR = object [8,1] in covariance matrix (in m³/kg)
  613.      */
  614.     public void setCsrpr(final double CSRPR) {
  615.         refuseFurtherComments();
  616.         setCovarianceMatrixEntry(7, 0, CSRPR);
  617.     }

  619.     /**
  620.      * Get the object [8,2] in covariance matrix (with index starting at 1).
  621.      * @return the object [8,2] in covariance matrix (in m³/kg)
  622.      */
  623.     public double getCsrpt() {
  624.         return covarianceMatrix.getEntry(7, 1);
  625.     }

  627.     /**
  628.      * Set the object [8,2] in covariance matrix (with index starting at 1).
  629.      * @param CSRPT = object [8,2] in covariance matrix (in m³/kg)
  630.      */
  631.     public void setCsrpt(final double CSRPT) {
  632.         refuseFurtherComments();
  633.         setCovarianceMatrixEntry(7, 1, CSRPT);
  634.     }

  636.     /**
  637.      * Get the object [8,3] in covariance matrix (with index starting at 1).
  638.      * @return the object [8,3] in covariance matrix (in m³/kg)
  639.      */
  640.     public double getCsrpn() {
  641.         return covarianceMatrix.getEntry(7, 2);
  642.     }

  644.     /**
  645.      * Set the object [8,3] in covariance matrix (with index starting at 1).
  646.      * @param CSRPN = object [8,3] in covariance matrix (in m³/kg)
  647.      */
  648.     public void setCsrpn(final double CSRPN) {
  649.         refuseFurtherComments();
  650.         setCovarianceMatrixEntry(7, 2, CSRPN);
  651.     }

  653.     /**
  654.      * Get the object [8,4] in covariance matrix (with index starting at 1).
  655.      * @return the object [8,4] in covariance matrix (in m³/(kg.s))
  656.      */
  657.     public double getCsrprdot() {
  658.         return covarianceMatrix.getEntry(7, 3);
  659.     }

  661.     /**
  662.      * Set the object [8,4] in covariance matrix (with index starting at 1).
  663.      * @param CSRPRdot = object [8,4] in covariance matrix (in m³/(kg.s))
  664.      */
  665.     public void setCsrprdot(final double CSRPRdot) {
  666.         refuseFurtherComments();
  667.         setCovarianceMatrixEntry(7, 3, CSRPRdot);
  668.     }

  670.     /**
  671.      * Get the object [8,5] in covariance matrix (with index starting at 1).
  672.      * @return the object [8,5] in covariance matrix (in m³/(kg.s))
  673.      */
  674.     public double getCsrptdot() {
  675.         return covarianceMatrix.getEntry(7, 4);
  676.     }

  678.     /**
  679.      * Set the object [8,5] in covariance matrix (with index starting at 1).
  680.      * @param CSRPTdot = object [8,5] in covariance matrix (in m³/(kg.s))
  681.      */
  682.     public void setCsrptdot(final double CSRPTdot) {
  683.         refuseFurtherComments();
  684.         setCovarianceMatrixEntry(7, 4, CSRPTdot);
  685.     }

  687.     /**
  688.      * Get the object [8,6] in covariance matrix (with index starting at 1).
  689.      * @return the object [8,6] in covariance matrix (in m³/(kg.s))
  690.      */
  691.     public double getCsrpndot() {
  692.         return covarianceMatrix.getEntry(7, 5);
  693.     }

  695.     /**
  696.      * Set the object [8,6] in covariance matrix (with index starting at 1).
  697.      * @param CSRPNdot = object [8,6] in covariance matrix (in m³/(kg.s))
  698.      */
  699.     public void setCsrpndot(final double CSRPNdot) {
  700.         refuseFurtherComments();
  701.         setCovarianceMatrixEntry(7, 5, CSRPNdot);
  702.     }

  704.     /**
  705.      * Get the object [8,7] in covariance matrix (with index starting at 1).
  706.      * @return the object [8,7] in covariance matrix (in m⁴/kg²)
  707.      */
  708.     public double getCsrpdrg() {
  709.         return covarianceMatrix.getEntry(7, 6);
  710.     }

  712.     /**
  713.      * Set the object [8,7] in covariance matrix (with index starting at 1).
  714.      * @param CSRPDRG = object [8,7] in covariance matrix (in m⁴/kg²)
  715.      */
  716.     public void setCsrpdrg(final double CSRPDRG) {
  717.         refuseFurtherComments();
  718.         setCovarianceMatrixEntry(7, 6, CSRPDRG);
  719.     }

  721.     /**
  722.      * Get the object [8,8] in covariance matrix (with index starting at 1).
  723.      * @return the object [8,8] in covariance matrix (in m⁴/kg²)
  724.      */
  725.     public double getCsrpsrp() {
  726.         return covarianceMatrix.getEntry(7, 7);
  727.     }

  729.     /**
  730.      * Set the object [8,8] in covariance matrix (with index starting at 1).
  731.      * @param CSRPSRP = object [8,8] in covariance matrix (in m⁴/kg²)
  732.      */
  733.     public void setCsrpsrp(final double CSRPSRP) {
  734.         refuseFurtherComments();
  735.         setCovarianceMatrixEntry(7, 7, CSRPSRP);
  736.     }

  738.     /**
  739.      * Get the object [9,1] in covariance matrix (with index starting at 1).
  740.      * @return the object [9,1] in covariance matrix (in m²/s²)
  741.      */
  742.     public double getCthrr() {
  743.         return covarianceMatrix.getEntry(8, 0);
  744.     }

  746.     /**
  747.      * Set the object [9,1] in covariance matrix (with index starting at 1).
  748.      * @param CTHRR = object [9,1] in covariance matrix (in m²/s²)
  749.      */
  750.     public void setCthrr(final double CTHRR) {
  751.         refuseFurtherComments();
  752.         setCovarianceMatrixEntry(8, 0, CTHRR);
  753.     }

  755.     /**
  756.      * Get the object [9,2] in covariance matrix (with index starting at 1).
  757.      * @return the object [9,2] in covariance matrix (in m²/s²)
  758.      */
  759.     public double getCthrt() {
  760.         return covarianceMatrix.getEntry(8, 1);
  761.     }

  763.     /**
  764.      * Set the object [9,2] in covariance matrix (with index starting at 1).
  765.      * @param CTHRT = object [9,2] in covariance matrix (in m²/s²)
  766.      */
  767.     public void setCthrt(final double CTHRT) {
  768.         refuseFurtherComments();
  769.         setCovarianceMatrixEntry(8, 1, CTHRT);
  770.     }

  772.     /**
  773.      * Get the object [9,3] in covariance matrix (with index starting at 1).
  774.      * @return the object [9,3] in covariance matrix (in m²/s²)
  775.      */
  776.     public double getCthrn() {
  777.         return covarianceMatrix.getEntry(8, 2);
  778.     }

  780.     /**
  781.      * Set the object [9,3] in covariance matrix (with index starting at 1).
  782.      * @param CTHRN = object [9,3] in covariance matrix (in m²/s²)
  783.      */
  784.     public void setCthrn(final double CTHRN) {
  785.         refuseFurtherComments();
  786.         setCovarianceMatrixEntry(8, 2, CTHRN);
  787.     }

  789.     /**
  790.      * Get the object [9,4] in covariance matrix (with index starting at 1).
  791.      * @return the object [9,4] in covariance matrix (in m²/s³)
  792.      */
  793.     public double getCthrrdot() {
  794.         return covarianceMatrix.getEntry(8, 3);
  795.     }

  797.     /**
  798.      * Set the object [9,4] in covariance matrix (with index starting at 1).
  799.      * @param CTHRRdot = object [9,4] in covariance matrix (in m²/s³)
  800.      */
  801.     public void setCthrrdot(final double CTHRRdot) {
  802.         refuseFurtherComments();
  803.         setCovarianceMatrixEntry(8, 3, CTHRRdot);
  804.     }

  806.     /**
  807.      * Get the object [9,5] in covariance matrix (with index starting at 1).
  808.      * @return the object [9,5] in covariance matrix (in m²/s³)
  809.      */
  810.     public double getCthrtdot() {
  811.         return covarianceMatrix.getEntry(8, 4);
  812.     }

  814.     /**
  815.      * Set the object [9,5] in covariance matrix (with index starting at 1).
  816.      * @param CTHRTdot = object [9,5] in covariance matrix (in m²/s³)
  817.      */
  818.     public void setCthrtdot(final double CTHRTdot) {
  819.         refuseFurtherComments();
  820.         setCovarianceMatrixEntry(8, 4, CTHRTdot);
  821.     }

  823.     /**
  824.      * Get the object [9,6] in covariance matrix (with index starting at 1).
  825.      * @return the object [9,6] in covariance matrix (in m²/s³)
  826.      */
  827.     public double getCthrndot() {
  828.         return covarianceMatrix.getEntry(8, 5);
  829.     }

  831.     /**
  832.      * Set the object [9,6] in covariance matrix (with index starting at 1).
  833.      * @param CTHRNdot = object [9,6] in covariance matrix (in m²/s³)
  834.      */
  835.     public void setCthrndot(final double CTHRNdot) {
  836.         refuseFurtherComments();
  837.         setCovarianceMatrixEntry(8, 5, CTHRNdot);
  838.     }

  840.     /**
  841.      * Get the object [9,7] in covariance matrix (with index starting at 1).
  842.      * @return the object [9,7] in covariance matrix (in m³/(kg.s²))
  843.      */
  844.     public double getCthrdrg() {
  845.         return covarianceMatrix.getEntry(8, 6);
  846.     }

  848.     /**
  849.      * Set the object [9,7] in covariance matrix (with index starting at 1).
  850.      * @param CTHRDRG = object [9,7] in covariance matrix (in m³/(kg.s²))
  851.      */
  852.     public void setCthrdrg(final double CTHRDRG) {
  853.         refuseFurtherComments();
  854.         setCovarianceMatrixEntry(8, 6, CTHRDRG);
  855.     }

  857.     /**
  858.      * Get the object [9,8] in covariance matrix (with index starting at 1).
  859.      * @return the object [9,8] in covariance matrix (in m³/(kg.s²))
  860.      */
  861.     public double getCthrsrp() {
  862.         return covarianceMatrix.getEntry(8, 7);
  863.     }

  865.     /**
  866.      * Set the object [9,8] in covariance matrix (with index starting at 1).
  867.      * @param CTHRSRP = object [9,8] in covariance matrix (in m³/(kg.s²))
  868.      */
  869.     public void setCthrsrp(final double CTHRSRP) {
  870.         refuseFurtherComments();
  871.         setCovarianceMatrixEntry(8, 7, CTHRSRP);
  872.     }

  874.     /**
  875.      * Get the object [9,9] in covariance matrix (with index starting at 1).
  876.      * @return the object [9,9] in covariance matrix (in m²/s⁴)
  877.      */
  878.     public double getCthrthr() {
  879.         return covarianceMatrix.getEntry(8, 8);
  880.     }

  882.     /**
  883.      * Set the object [9,9] in covariance matrix (with index starting at 1).
  884.      * @param CTHRTHR = object [9,9] in covariance matrix (in m²/s⁴)
  885.      */
  886.     public void setCthrthr(final double CTHRTHR) {
  887.         refuseFurtherComments();
  888.         setCovarianceMatrixEntry(8, 8, CTHRTHR);
  889.     }

  891. }
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