Package org.orekit.estimation.measurements.gnss

Class Phase

java.lang.Object

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

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

org.orekit.estimation.measurements.gnss.Phase

All Implemented Interfaces:

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

public class Phase
extends SignalBasedMeasurement<Phase>

Class modeling a phase measurement from a ground station.

The measurement is considered to be a signal emitted from a spacecraft and received on a ground station. Its value is the number of cycles between emission and reception. The motion of both the station and the 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:

9.2

Author:

Thierry Ceolin, Luc Maisonobe, Maxime Journot

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
Phase(Observer observer, AbsoluteDate date, double phase, double wavelength, double sigma, double baseWeight, ObservableSatellite satellite, AmbiguityCache cache)	Simple constructor.
Phase(Observer observer, AbsoluteDate date, double phase, double wavelength, MeasurementQuality measurementQuality, SignalTravelTimeModel signalTravelTimeModel, ObservableSatellite satellite, AmbiguityCache cache)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
AmbiguityDriver	getAmbiguityDriver()	Get the driver for phase ambiguity.
final Observer	getObserver()	Get receiving observer.
double	getWavelength()	Get the wavelength.
protected EstimatedMeasurement<Phase>	theoreticalEvaluation(int iteration, int evaluation, SpacecraftState[] states)	Estimate the theoretical value.
protected EstimatedMeasurementBase<Phase>	theoreticalEvaluationWithoutDerivatives(int iteration, int evaluation, SpacecraftState[] states, boolean fillParticipants)	Estimate the theoretical value without derivatives.

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, 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

Field Details

MEASUREMENT_TYPE

public static final String MEASUREMENT_TYPE

Type of the measurement.

See Also:

• Constant Field Values

Constructor Details

Phase

public Phase(Observer observer,
 AbsoluteDate date,
 double phase,
 double wavelength,
 double sigma,
 double baseWeight,
 ObservableSatellite satellite,
 AmbiguityCache cache)

Simple constructor.

Parameters:

observer - observer that performs the measurement

date - date of the measurement

phase - observed value (cycles)

wavelength - phase observed value wavelength (m)

sigma - theoretical standard deviation

baseWeight - base weight

satellite - satellite related to this measurement

cache - from which ambiguity drive should come

Since:

12.1

Phase

public Phase(Observer observer,
 AbsoluteDate date,
 double phase,
 double wavelength,
 MeasurementQuality measurementQuality,
 SignalTravelTimeModel signalTravelTimeModel,
 ObservableSatellite satellite,
 AmbiguityCache cache)

Simple constructor.

Parameters:

observer - observer that performs the measurement

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

satellite - satellite related to this measurement

cache - from which ambiguity drive should come

Since:

14.0

Method Details

getObserver

public final Observer getObserver()

Get receiving observer.

Returns:

observer

getWavelength

public double getWavelength()

Get the wavelength.

Returns:

wavelength (m)

getAmbiguityDriver

public AmbiguityDriver getAmbiguityDriver()

Get the driver for phase ambiguity.

Returns:

the driver for phase ambiguity

Since:

10.3

theoreticalEvaluationWithoutDerivatives

protected EstimatedMeasurementBase<Phase> theoreticalEvaluationWithoutDerivatives(int iteration,
 int evaluation,
 SpacecraftState[] states,
 boolean fillParticipants)

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<Phase>

Parameters:

iteration - iteration number

evaluation - evaluation number

states - orbital states at measurement date

fillParticipants - flag to compute and store participants dynamical states at measurement date and along signal path if applicable

Returns:

theoretical value

See Also:

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

theoreticalEvaluation

protected EstimatedMeasurement<Phase> 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<Phase>

Parameters:

iteration - iteration number

evaluation - evaluation number

states - orbital states at measurement date

Returns:

theoretical value

See Also:

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