Package org.orekit.estimation.measurements

Class DualReceiverMeasurement<T extends AbstractMeasurement<T>>

java.lang.Object

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

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

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

Type Parameters:

T - type of the measurement

All Implemented Interfaces:

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

Direct Known Subclasses:

FDOA, TDOA

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

Class modeling a twice-received measurement using a primary and secondary observer.

The measurement is considered to be a signal:

• Emitted by the observed spacecraft
• Received by the first observer
• Received by the second observer

The date of the measurement corresponds to the reception on of the signal by the first observer.

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

Since:

14.0

Author:

Brianna Aubin

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DualReceiverMeasurement(Observer primeObserver, Observer secondObserver, AbsoluteDate date, double[] value, MeasurementQuality measurementQuality, SignalTravelTimeModel signalTravelTimeModel, ObservableSatellite satellite)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
protected Gradient[]	computeDelays(SpacecraftState[] states)	Compute signal delays (always positive).
protected void	fillEstimation(Gradient quantity, Map<String,Integer> paramIndices, EstimatedMeasurement<T> estimated)	Fill estimated measurements with value and derivatives.
Observer	getPrimeObserver()	Get the prime observer, the one that receives the signal first.
GroundStation	getPrimeStation()	Deprecated. as of 14.0, replaced by getPrimeObserver()
Observer	getSecondObserver()	Get the second observer, the one that gives the measurement.
GroundStation	getSecondStation()	Deprecated. as of 14.0, replaced by getSecondObserver()

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

DualReceiverMeasurement

protected DualReceiverMeasurement(Observer primeObserver,
 Observer secondObserver,
 AbsoluteDate date,
 double[] value,
 MeasurementQuality measurementQuality,
 SignalTravelTimeModel signalTravelTimeModel,
 ObservableSatellite satellite)

Simple constructor.

Parameters:

primeObserver - observer from which transmission is performed

secondObserver - 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

getPrimeStation

@Deprecated
public GroundStation getPrimeStation()

Deprecated.

as of 14.0, replaced by getPrimeObserver()

Get the prime ground station, the one that receives the signal first.

Returns:

prime ground station

getPrimeObserver

public Observer getPrimeObserver()

Get the prime observer, the one that receives the signal first.

Returns:

prime observer

getSecondStation

@Deprecated
public GroundStation getSecondStation()

Deprecated.

as of 14.0, replaced by getSecondObserver()

Get the second ground station, the one that receives the signal first.

Returns:

second ground station

getSecondObserver

public Observer getSecondObserver()

Get the second observer, the one that gives the measurement.

Returns:

second observer

computeDelays

protected Gradient[] computeDelays(SpacecraftState[] states)

Compute signal delays (always positive).

Parameters:

states - observed states

Returns:

delays (to prime and second sensors)

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