org.orekit.estimation.measurements.gnss

Class OneWayGNSSPhase

java.lang.Object

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

org.orekit.estimation.measurements.gnss.OneWayGNSSPhase

All Implemented Interfaces:

Comparable<ComparableMeasurement>, ComparableMeasurement, ObservedMeasurement<OneWayGNSSPhase>, TimeStamped

public class OneWayGNSSPhase
extends AbstractMeasurement<OneWayGNSSPhase>

One-way GNSS phase measurement.

This class can be used in precise orbit determination applications for modeling a phase measurement between a GNSS satellite (emitter) and a LEO satellite (receiver).

The one-way GNSS phase measurement assumes knowledge of the orbit and the clock offset of the emitting GNSS satellite. For instance, it is possible to use a SP3 file or a GNSS navigation message to recover the satellite's orbit and clock.

This class is very similar to InterSatellitesPhase measurement class. However, using the one-way GNSS phase measurement, the orbit and clock of the emitting GNSS satellite are NOT estimated simultaneously with LEO satellite coordinates.

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
OneWayGNSSPhase(PVCoordinatesProvider remote, double dtRemote, AbsoluteDate date, double phase, double wavelength, double sigma, double baseWeight, ObservableSatellite local) Simple constructor.

Method Summary

Modifier and Type	Method and Description
ParameterDriver	getAmbiguityDriver() Get the driver for phase ambiguity.
double	getWavelength() Get the wavelength.
protected EstimatedMeasurement<OneWayGNSSPhase>	theoreticalEvaluation(int iteration, int evaluation, SpacecraftState[] states) Estimate the theoretical value.

Methods inherited from class org.orekit.estimation.measurements.AbstractMeasurement

addModifier, addParameterDriver, estimate, 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

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

OneWayGNSSPhase

public OneWayGNSSPhase(PVCoordinatesProvider remote,
                       double dtRemote,
                       AbsoluteDate date,
                       double phase,
                       double wavelength,
                       double sigma,
                       double baseWeight,
                       ObservableSatellite local)

Simple constructor.

Parameters:

remote - provider for GNSS satellite which simply emits the signal

dtRemote - clock offset of the GNSS satellite, in seconds

date - date of the measurement

phase - observed value, in cycles

wavelength - phase observed value wavelength, in meters

sigma - theoretical standard deviation

baseWeight - base weight

local - satellite which receives the signal and perform the measurement

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

theoreticalEvaluation

protected EstimatedMeasurement<OneWayGNSSPhase> 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<OneWayGNSSPhase>

Parameters:

iteration - iteration number

evaluation - evaluation number

states - orbital states at measurement date

Returns:

theoretical value

See Also:

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