Package org.orekit.estimation.measurements.gnss

Class InterSatellitesPhase

java.lang.Object

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

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

org.orekit.estimation.measurements.gnss.AbstractInterSatellitesMeasurement<InterSatellitesPhase>

org.orekit.estimation.measurements.gnss.InterSatellitesPhase

All Implemented Interfaces:

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

public class InterSatellitesPhase
extends AbstractInterSatellitesMeasurement<InterSatellitesPhase>

Phase measurement between two satellites.

The measurement is considered to be a signal emitted from a remote satellite and received by a local satellite. Its value is the number of cycles between emission and reception. The motion of both spacecraft during the signal flight time are taken into account. The date of the measurement corresponds to the reception on ground of the emitted signal.

Since:

10.3

Author:

Bryan Cazabonne

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
InterSatellitesPhase(ObservableSatellite local, ObservableSatellite remote, AbsoluteDate date, double phase, double wavelength, double sigma, double baseWeight, AmbiguityCache cache)	Constructor with default signal travel time model.
InterSatellitesPhase(ObservableSatellite local, ObservableSatellite remote, AbsoluteDate date, double phase, double wavelength, MeasurementQuality measurementQuality, SignalTravelTimeModel signalTravelTimeModel, AmbiguityCache cache)	Constructor.

Method Summary

Modifier and Type	Method	Description
ParameterDriver	getAmbiguityDriver()	Get the driver for phase ambiguity.
double	getWavelength()	Get the wavelength.
protected EstimatedMeasurement<InterSatellitesPhase>	theoreticalEvaluation(int iteration, int evaluation, SpacecraftState[] states)	Estimate the theoretical value.
protected EstimatedMeasurementBase<InterSatellitesPhase>	theoreticalEvaluationWithoutDerivatives(int iteration, int evaluation, SpacecraftState[] states)	Estimate the theoretical value without derivatives.

Methods inherited from class org.orekit.estimation.measurements.gnss.AbstractInterSatellitesMeasurement

getRemoteClock, getRemoteClock, getRemotePV, getRemotePV

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

InterSatellitesPhase

public InterSatellitesPhase(ObservableSatellite local,
 ObservableSatellite remote,
 AbsoluteDate date,
 double phase,
 double wavelength,
 double sigma,
 double baseWeight,
 AmbiguityCache cache)

Constructor with default signal travel time model.

Parameters:

local - satellite which receives the signal and performs the measurement

remote - remote satellite which simply emits the signal

date - date of the measurement

phase - observed value (cycles)

wavelength - phase observed value wavelength (m)

sigma - theoretical standard deviation

baseWeight - base weight

cache - from which ambiguity drive should come

Since:

12.1

InterSatellitesPhase

public InterSatellitesPhase(ObservableSatellite local,
 ObservableSatellite remote,
 AbsoluteDate date,
 double phase,
 double wavelength,
 MeasurementQuality measurementQuality,
 SignalTravelTimeModel signalTravelTimeModel,
 AmbiguityCache cache)

Constructor.

Parameters:

local - satellite which receives the signal and performs the measurement

remote - remote satellite which simply emits the signal

date - date of the measurement

phase - observed value (cycles)

wavelength - phase observed value wavelength (m)

measurementQuality - measurement quality data as used in orbit determination

signalTravelTimeModel - signal model

cache - from which ambiguity drive should come

Since:

14.0

Method Details

getWavelength

public double getWavelength()

Get the wavelength.

Returns:

wavelength (m)

getAmbiguityDriver

public ParameterDriver getAmbiguityDriver()

Get the driver for phase ambiguity.

Returns:

the driver for phase ambiguity

theoreticalEvaluationWithoutDerivatives

protected EstimatedMeasurementBase<InterSatellitesPhase> 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<InterSatellitesPhase>

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<InterSatellitesPhase> 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<InterSatellitesPhase>

Parameters:

iteration - iteration number

evaluation - evaluation number

states - orbital states at measurement date

Returns:

theoretical value

See Also:

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