org.orekit.estimation.measurements.gnss

Class InterSatellitesPhase

java.lang.Object

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

org.orekit.estimation.measurements.gnss.InterSatellitesPhase

All Implemented Interfaces:

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

public class InterSatellitesPhase
extends AbstractMeasurement<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 spacecrafts 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 and Description
static String	AMBIGUITY_NAME Name for ambiguity driver.
static String	MEASUREMENT_TYPE Type of the measurement.

Constructor Summary

Constructors

Constructor and Description
InterSatellitesPhase(ObservableSatellite local, ObservableSatellite remote, AbsoluteDate date, double phase, double wavelength, double sigma, double baseWeight) Constructor.

Method Summary

Modifier and Type	Method and 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.AbstractMeasurement

addModifier, addParameterDriver, estimate, estimateWithoutDerivatives, getBaseWeight, getCoordinates, getDate, getDimension, getModifiers, getObservedValue, getParametersDrivers, getSatellites, getTheoreticalStandardDeviation, isEnabled, setEnabled, signalTimeOfFlight, signalTimeOfFlight

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.ObservedMeasurement

getMeasurementType

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

compareTo

Methods inherited from interface org.orekit.time.TimeStamped

durationFrom

Methods inherited from interface org.orekit.utils.ParameterDriversProvider

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

Field Detail

MEASUREMENT_TYPE

public static final String MEASUREMENT_TYPE

Type of the measurement.

See Also:

Constant Field Values

AMBIGUITY_NAME

public static final String AMBIGUITY_NAME

Name for ambiguity driver.

See Also:

Constant Field Values

Constructor Detail

InterSatellitesPhase

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

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)

sigma - theoretical standard deviation

baseWeight - base weight

Method Detail

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 theoretical value does not have any modifiers applied.

Specified by:

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[])