Package org.orekit.estimation.measurements

Class AngularAzEl

java.lang.Object

org.orekit.estimation.measurements.AbstractMeasurement<AngularAzEl>

org.orekit.estimation.measurements.SignalBasedMeasurement<AngularAzEl>

org.orekit.estimation.measurements.AngularMeasurement<AngularAzEl>

org.orekit.estimation.measurements.AngularAzEl

All Implemented Interfaces:

Comparable<ComparableMeasurement>, ComparableMeasurement, ObservedMeasurement<AngularAzEl>, TimeStamped, ParameterDriversProvider

public class AngularAzEl
extends AngularMeasurement<AngularAzEl>

Class modeling an Azimuth-Elevation measurement from a ground station. The motion of the spacecraft during the signal flight time is taken into account. The date of the measurement corresponds to the reception on ground of the reflected signal.

Since:

8.0

Author:

Thierry Ceolin

Field Summary

Fields

Modifier and Type	Field	Description
static final String	MEASUREMENT_TYPE	Type of the measurement.

Constructor Summary

Constructors

Constructor	Description
AngularAzEl(GroundStation station, AbsoluteDate date, double[] angular, double[] sigma, double[] baseWeight, ObservableSatellite satellite)	Simple constructor.
AngularAzEl(GroundStation station, AbsoluteDate date, double[] angular, MeasurementQuality measurementQuality, SignalTravelTimeModel signalTravelTimeModel, ObservableSatellite satellite)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
Vector3D	getObservedLineOfSight(Frame outputFrame)	Calculate the Line Of Sight of the given measurement.
GroundStation	getStation()	Getter for the ground receiver.
protected EstimatedMeasurement<AngularAzEl>	theoreticalEvaluation(int iteration, int evaluation, SpacecraftState[] states)	Estimate the theoretical value.
protected EstimatedMeasurementBase<AngularAzEl>	theoreticalEvaluationWithoutDerivatives(int iteration, int evaluation, SpacecraftState[] states)	Estimate the theoretical value without derivatives.

Methods inherited from class org.orekit.estimation.measurements.AngularMeasurement

computeEmissionDate, computeEmissionDateField, fillDerivatives, fillEstimatedMeasurement, wrapFirstAngle, wrapFirstAngle

Methods inherited from class org.orekit.estimation.measurements.SignalBasedMeasurement

getSignalTravelTimeModel, isTwoWay

Methods inherited from class org.orekit.estimation.measurements.AbstractMeasurement

addModifier, addParameterDriver, addParametersDrivers, estimate, estimateWithoutDerivatives, getCoordinates, getDate, getMeasurementQuality, getModifiers, getObservedValue, getParameterIndices, getParametersDrivers, getSatellites, isEnabled, setEnabled, setObservedValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.estimation.measurements.ComparableMeasurement

compareTo

Methods inherited from interface org.orekit.estimation.measurements.ObservedMeasurement

estimateWithoutDerivatives, getBaseWeight, getDimension, getMeasurementType, getTheoreticalStandardDeviation

Methods inherited from interface org.orekit.utils.ParameterDriversProvider

getNbParametersDriversValue, getParameterDriver, getParameters, getParameters, getParameters, getParameters, getParametersAllValues, getParametersAllValues, isSupported

Methods inherited from interface org.orekit.time.TimeStamped

durationFrom

Field Details

MEASUREMENT_TYPE

public static final String MEASUREMENT_TYPE

Type of the measurement.

See Also:

• Constant Field Values

Constructor Details

AngularAzEl

public AngularAzEl(GroundStation station,
 AbsoluteDate date,
 double[] angular,
 MeasurementQuality measurementQuality,
 SignalTravelTimeModel signalTravelTimeModel,
 ObservableSatellite satellite)

Simple constructor.

Parameters:

station - ground station from which measurement is performed

date - date of the measurement

angular - observed value

measurementQuality - measurement quality as used in estimation (in Orekit, the crossed-terms of the covariance matrix are only used by Kalman filters, not least squares)

signalTravelTimeModel - signal travel time model

satellite - satellite related to this measurement

Since:

14.0

AngularAzEl

public AngularAzEl(GroundStation station,
 AbsoluteDate date,
 double[] angular,
 double[] sigma,
 double[] baseWeight,
 ObservableSatellite satellite)

Simple constructor.

Parameters:

station - ground station from which measurement is performed

date - date of the measurement

angular - observed value

sigma - theoretical standard deviation

baseWeight - base weight

satellite - satellite related to this measurement

Since:

9.3

Method Details

getStation

public GroundStation getStation()

Getter for the ground receiver.

Returns:

station

theoreticalEvaluationWithoutDerivatives

protected EstimatedMeasurementBase<AngularAzEl> theoreticalEvaluationWithoutDerivatives(int iteration,
 int evaluation,
 SpacecraftState[] states)

Estimate the theoretical value without derivatives. The default implementation uses the computation with derivatives and ought to be overwritten for performance.

The theoretical value does not have any modifiers applied.

Overrides:

theoreticalEvaluationWithoutDerivatives in class AbstractMeasurement<AngularAzEl>

Parameters:

iteration - iteration number

evaluation - evaluation number

states - orbital states at measurement date

Returns:

theoretical value

See Also:

• AbstractMeasurement.estimate(int, int, SpacecraftState[])

theoreticalEvaluation

protected EstimatedMeasurement<AngularAzEl> theoreticalEvaluation(int iteration,
 int evaluation,
 SpacecraftState[] states)

Estimate the theoretical value.

The theoretical value does not have any modifiers applied.

Specified by:

theoreticalEvaluation in class AbstractMeasurement<AngularAzEl>

Parameters:

iteration - iteration number

evaluation - evaluation number

states - orbital states at measurement date

Returns:

theoretical value

See Also:

• AbstractMeasurement.estimate(int, int, SpacecraftState[])

getObservedLineOfSight

public Vector3D getObservedLineOfSight(Frame outputFrame)

Calculate the Line Of Sight of the given measurement.

Parameters:

outputFrame - output frame of the line of sight vector

Returns:

Vector3D the line of Sight of the measurement