Package org.orekit.estimation.measurements

Class MeasurementQuality

java.lang.Object

org.orekit.estimation.measurements.MeasurementQuality

public class MeasurementQuality
extends Object

Data container for measurement's expected quality (used in orbit determination).

Since:

14.0

Author:

Romain Serra

Constructor Summary

Constructors

Constructor	Description
MeasurementQuality(double[][] covarianceMatrix, double weight)	Constructor with same value for weights.
MeasurementQuality(double[][] covarianceMatrix, double[] weights)	Constructor with full covariance.
MeasurementQuality(double[] standardDeviations, double weight)	Constructor with sigmas as input and same value for weights (assuming no correlation).
MeasurementQuality(double[] standardDeviations, double[] weights)	Constructor with sigmas.
MeasurementQuality(double standardDeviation, double weight)	Constructor with sigmas as input for unidimensional measurement.

Method Summary

Modifier and Type	Method	Description
double[][]	getCorrelationCoefficientsMatrix()	Get the correlation coefficients matrix.
double[][]	getCovarianceMatrix()	Getter for the measurement covariance matrix.
int	getDimension()	Getter for the measurement dimension.
double[]	getStandardDeviations()	Getter for the standard deviations a.k.a. sigmas for each component of the measurement.
double[]	getWeights()	Getter for the weights corresponding to each component of the measurement.

Methods inherited from class java.lang.Object

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

Constructor Detail

MeasurementQuality

public MeasurementQuality(double standardDeviation,
                          double weight)

Constructor with sigmas as input for unidimensional measurement.

Parameters:

standardDeviation - measurement standard deviation

weight - measurement component's weight (same for all)

MeasurementQuality

public MeasurementQuality(double[] standardDeviations,
                          double weight)

Constructor with sigmas as input and same value for weights (assuming no correlation).

Parameters:

standardDeviations - measurement standard deviations matrix

weight - measurement component's weight (same for all)

MeasurementQuality

public MeasurementQuality(double[][] covarianceMatrix,
                          double weight)

Constructor with same value for weights.

Parameters:

covarianceMatrix - measurement covariance matrix

weight - measurement component's weight (same for all)

MeasurementQuality

public MeasurementQuality(double[][] covarianceMatrix,
                          double[] weights)

Constructor with full covariance.

Parameters:

covarianceMatrix - measurement covariance matrix

weights - measurement component's weights

MeasurementQuality

public MeasurementQuality(double[] standardDeviations,
                          double[] weights)

Constructor with sigmas.

Parameters:

standardDeviations - measurement standard deviations

weights - measurement component's weights

Method Detail

getDimension

public int getDimension()

Getter for the measurement dimension.

Returns:

dimension

getCovarianceMatrix

public double[][] getCovarianceMatrix()

Getter for the measurement covariance matrix.

Returns:

covariance

getStandardDeviations

public double[] getStandardDeviations()

Getter for the standard deviations a.k.a. sigmas for each component of the measurement.

Returns:

standard deviations

getCorrelationCoefficientsMatrix

public double[][] getCorrelationCoefficientsMatrix()

Get the correlation coefficients matrix.

This is the square, symmetric matrix M such that:

Mij = Pij/(σi.σj)

Where:

• P is the covariance matrix
• σi is the i-th standard deviation (σi² = Pii)

Returns:

the correlation coefficient matrix

getWeights

public double[] getWeights()

Getter for the weights corresponding to each component of the measurement.

Returns:

weights