Package org.orekit.estimation.measurements

Class BistaticRangeRelatedMeasurement<T extends AbstractMeasurement<T>>

java.lang.Object

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

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

org.orekit.estimation.measurements.BistaticRangeRelatedMeasurement<T>

Type Parameters:

T - type of the measurement

All Implemented Interfaces:

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

Direct Known Subclasses:

BistaticRange, BistaticRangeRate

public abstract class BistaticRangeRelatedMeasurement<T extends AbstractMeasurement<T>>
extends SignalBasedMeasurement<T>

Class modeling a bistatic measurement using an emitting observer and a receiving observer.

The measurement is considered to be a signal:

• Emitted from the emitting observer
• Reflected on the spacecraft
• Received on the receiving observer

The date of the measurement corresponds to the reception of the reflected signal.

The motion of the observers and the spacecraft during the signal flight time are taken into account.

Since:

14.0

Author:

Romain Serra

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BistaticRangeRelatedMeasurement(Observer emitter, Observer receiver, AbsoluteDate date, double[] value, MeasurementQuality measurementQuality, SignalTravelTimeModel signalTravelTimeModel, ObservableSatellite satellite)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
protected void	fillEstimation(Gradient quantity, Map<String,Integer> paramIndices, EstimatedMeasurement<T> estimated)	Fill estimated measurements with value and derivatives.
Observer	getEmitter()	Get the emitter object.
GroundStation	getEmitterStation()	Deprecated. as of 14.0, replaced by getEmitter()
protected Gradient[]	getFieldShifts(SpacecraftState[] states)	Method computing consecutive Field time shifts of participants, starting from observation date.
Observer	getReceiver()	Get the receiver object.
GroundStation	getReceiverStation()	Deprecated. as of 14.0, replaced by getReceiver()
protected double[]	getShifts(SpacecraftState state, PVCoordinatesProvider emitterPVProvider, PVCoordinatesProvider receiverPVProvider)	Method computing consecutive Field time shifts of participants, starting from observation date.
TwoLeggedSignalTimer	getTwoLeggedSignalTimer()	Getter for the two legs timer.

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, theoreticalEvaluation, theoreticalEvaluationWithoutDerivatives, theoreticalEvaluationWithoutDerivatives

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

Constructor Details

BistaticRangeRelatedMeasurement

protected BistaticRangeRelatedMeasurement(Observer emitter,
 Observer receiver,
 AbsoluteDate date,
 double[] value,
 MeasurementQuality measurementQuality,
 SignalTravelTimeModel signalTravelTimeModel,
 ObservableSatellite satellite)

Simple constructor.

Parameters:

emitter - observer from which transmission is performed

receiver - observer from which measurement is performed

date - date of the measurement

value - observed value

measurementQuality - measurement quality data as used in orbit determination

signalTravelTimeModel - signal travel time model

satellite - satellite related to this measurement

Method Details

getTwoLeggedSignalTimer

public TwoLeggedSignalTimer getTwoLeggedSignalTimer()

Getter for the two legs timer.

Returns:

model

getEmitterStation

@Deprecated
public GroundStation getEmitterStation()

Deprecated.

as of 14.0, replaced by getEmitter()

Get the emitter ground station.

Returns:

emitter ground station

getEmitter

public Observer getEmitter()

Get the emitter object.

Returns:

emitter object

Since:

14.0

getReceiverStation

@Deprecated
public GroundStation getReceiverStation()

Deprecated.

as of 14.0, replaced by getReceiver()

Get the receiver ground station.

Returns:

receiver ground station

getReceiver

public Observer getReceiver()

Get the receiver object.

Returns:

receiver object

Since:

14.0

getShifts

protected double[] getShifts(SpacecraftState state,
 PVCoordinatesProvider emitterPVProvider,
 PVCoordinatesProvider receiverPVProvider)

Method computing consecutive Field time shifts of participants, starting from observation date.

Parameters:

state - observable state

emitterPVProvider - emitter coordinates provider

receiverPVProvider - receiver coordinates provider

Returns:

signal participants

getFieldShifts

protected Gradient[] getFieldShifts(SpacecraftState[] states)

Method computing consecutive Field time shifts of participants, starting from observation date.

Parameters:

states - observables

Returns:

time shifts

fillEstimation

protected void fillEstimation(Gradient quantity,
 Map<String,Integer> paramIndices,
 EstimatedMeasurement<T> estimated)

Fill estimated measurements with value and derivatives.

Parameters:

quantity - estimated quantity

paramIndices - indices mapping parameter names to derivative indices

estimated - theoretical measurement class