Package org.orekit.estimation.measurements.gnss

Class AbstractInterSatellitesMeasurement<T extends ObservedMeasurement<T>>

java.lang.Object

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

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

Type Parameters:

T - type of the measurement

All Implemented Interfaces:

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

Direct Known Subclasses:

InterSatellitesOneWayRangeRate, InterSatellitesPhase

public abstract class AbstractInterSatellitesMeasurement<T extends ObservedMeasurement<T>>
extends AbstractMeasurement<T>

Base class for measurement between two satellites that are both estimated.

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:

12.1

Author:

Luc Maisonobe

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractInterSatellitesMeasurement(AbsoluteDate date, double observed, double sigma, double baseWeight, ObservableSatellite local, ObservableSatellite remote)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected CommonParametersWithDerivatives	computeCommonParametersWith(SpacecraftState[] states, boolean clockOffsetAlreadyApplied)	Compute common estimation parameters.
protected CommonParametersWithoutDerivatives	computeCommonParametersWithout(SpacecraftState[] states, boolean clockOffsetAlreadyApplied)	Compute common estimation parameters.
protected QuadraticClockModel	getRemoteClock()	Retrieves the clock of the satellite being treated as "remote" in this function (i.e. sat number 2).
protected QuadraticFieldClockModel<Gradient>	getRemoteClock(int freeParameters, Map<String,Integer> indices)	Get emitting satellite clock provider.
protected PVCoordinatesProvider	getRemotePV(SpacecraftState state)	Return the FieldPVCoordinatesProvider.
protected FieldPVCoordinatesProvider<Gradient>	getRemotePV(SpacecraftState state, int freeParameters)	Return the FieldPVCoordinatesProvider.

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

addModifier, addParameterDriver, addParametersDrivers, estimate, estimateWithoutDerivatives, getBaseWeight, getCoordinates, getDate, getDimension, getModifiers, getObservedValue, getParametersDrivers, getSatellites, getSignalTravelTimeModel, getTheoreticalStandardDeviation, isEnabled, isTwoWay, setEnabled, setObservedValue, 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

estimateWithoutDerivatives, 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

AbstractInterSatellitesMeasurement

protected AbstractInterSatellitesMeasurement(AbsoluteDate date,
                                             double observed,
                                             double sigma,
                                             double baseWeight,
                                             ObservableSatellite local,
                                             ObservableSatellite remote)

Constructor.

Parameters:

date - date of the measurement

observed - observed value

sigma - theoretical standard deviation

baseWeight - base weight

local - satellite which receives the signal and performs the measurement

remote - remote satellite which simply emits the signal

Method Detail

getRemoteClock

protected QuadraticClockModel getRemoteClock()

Retrieves the clock of the satellite being treated as "remote" in this function (i.e. sat number 2).

Returns:

ObservableSatellite clock

getRemoteClock

protected QuadraticFieldClockModel<Gradient> getRemoteClock(int freeParameters,
                                                            Map<String,Integer> indices)

Get emitting satellite clock provider.

Parameters:

freeParameters - total number of free parameters in the gradient

indices - indices of the differentiation parameters in derivatives computations, must be span name and not driver name

Returns:

emitting satellite clock provider

getRemotePV

protected PVCoordinatesProvider getRemotePV(SpacecraftState state)

Return the FieldPVCoordinatesProvider.

Parameters:

state - ObservableSatellite spacecraft state

Returns:

pos/vel coordinates provider for values with Gradient field

Since:

14.0

getRemotePV

protected FieldPVCoordinatesProvider<Gradient> getRemotePV(SpacecraftState state,
                                                           int freeParameters)

Return the FieldPVCoordinatesProvider.

Parameters:

state - ObservableSatellite spacecraft state

freeParameters - number of free parameters

Returns:

pos/vel coordinates provider for values with Gradient field

Since:

14.0

computeCommonParametersWithout

protected CommonParametersWithoutDerivatives computeCommonParametersWithout(SpacecraftState[] states,
                                                                            boolean clockOffsetAlreadyApplied)

Compute common estimation parameters.

Parameters:

states - states of all spacecraft involved in the measurement

clockOffsetAlreadyApplied - if true, the specified date is as read by the receiver clock (i.e. clock offset not compensated), if false, the specified date was already compensated and is a physical absolute date

Returns:

common parameters

computeCommonParametersWith

protected CommonParametersWithDerivatives computeCommonParametersWith(SpacecraftState[] states,
                                                                      boolean clockOffsetAlreadyApplied)

Compute common estimation parameters.

Parameters:

states - states of all spacecraft involved in the measurement

clockOffsetAlreadyApplied - if true, the specified date is as read by the receiver clock (i.e. clock offset not compensated), if false, the specified date was already compensated and is a physical absolute date

Returns:

common parameters