Package org.orekit.estimation.measurements.gnss

Class AbstractOneWayGNSSMeasurement<T extends ObservedMeasurement<T>>

java.lang.Object

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

org.orekit.estimation.measurements.gnss.AbstractOnBoardMeasurement<T>

org.orekit.estimation.measurements.gnss.AbstractOneWayGNSSMeasurement<T>

Type Parameters:

T - type of the measurement

All Implemented Interfaces:

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

Direct Known Subclasses:

OneWayGNSSPhase, OneWayGNSSRange, OneWayGNSSRangeRate

public abstract class AbstractOneWayGNSSMeasurement<T extends ObservedMeasurement<T>>
extends AbstractOnBoardMeasurement<T>

Base class for one-way GNSS measurement.

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

The one-way GNSS range 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 AbstractInterSatellitesMeasurement measurement class. However, using the one-way GNSS range measurement, the orbit and clock of the emitting GNSS satellite are NOT estimated simultaneously with LEO satellite coordinates.

Since:

12.1

Author:

Luc Maisonobe

Constructor Summary

Constructors

Constructor	Description
AbstractOneWayGNSSMeasurement(PVCoordinatesProvider remotePV, QuadraticClockModel remoteClock, AbsoluteDate date, double range, double sigma, double baseWeight, ObservableSatellite local)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
protected QuadraticClockModel	getRemoteClock()	Get emitting satellite clock provider.
protected PVCoordinatesProvider	getRemotePV(SpacecraftState[] states)	Get emitting satellite position/velocity provider.
protected FieldPVCoordinatesProvider<Gradient>	getRemotePV(SpacecraftState[] states, int freeParameters)	Get emitting satellite position/velocity provider.

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

computeCommonParametersWith, computeCommonParametersWithout, getRemoteClock

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, signalTimeOfFlight, signalTimeOfFlight, signalTimeOfFlight, signalTimeOfFlight, theoreticalEvaluation, 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

getMeasurementType

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 Detail

AbstractOneWayGNSSMeasurement

public AbstractOneWayGNSSMeasurement(PVCoordinatesProvider remotePV,
                                     QuadraticClockModel remoteClock,
                                     AbsoluteDate date,
                                     double range,
                                     double sigma,
                                     double baseWeight,
                                     ObservableSatellite local)

Simple constructor.

Parameters:

remotePV - provider for GNSS satellite which simply emits the signal

remoteClock - clock offset of the GNSS satellite

date - date of the measurement

range - observed value

sigma - theoretical standard deviation

baseWeight - base weight

local - satellite which receives the signal and perform the measurement

Method Detail

getRemotePV

protected PVCoordinatesProvider getRemotePV(SpacecraftState[] states)

Get emitting satellite position/velocity provider.

Specified by:

getRemotePV in class AbstractOnBoardMeasurement<T extends ObservedMeasurement<T>>

Parameters:

states - states of all spacecraft involved in the measurement

Returns:

emitting satellite position/velocity provider

getRemoteClock

protected QuadraticClockModel getRemoteClock()

Get emitting satellite clock provider.

Specified by:

getRemoteClock in class AbstractOnBoardMeasurement<T extends ObservedMeasurement<T>>

Returns:

emitting satellite clock provider

getRemotePV

protected FieldPVCoordinatesProvider<Gradient> getRemotePV(SpacecraftState[] states,
                                                           int freeParameters)

Get emitting satellite position/velocity provider.

Specified by:

getRemotePV in class AbstractOnBoardMeasurement<T extends ObservedMeasurement<T>>

Parameters:

states - states of all spacecraft involved in the measurement

freeParameters - total number of free parameters in the gradient

Returns:

emitting satellite position/velocity provider