org.orekit.estimation.measurements

Class TurnAroundRange

java.lang.Object

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

org.orekit.estimation.measurements.TurnAroundRange

All Implemented Interfaces:

ObservedMeasurement<TurnAroundRange>, TimeStamped

public class TurnAroundRange
extends AbstractMeasurement<TurnAroundRange>

Class modeling a turn-around range measurement using a master ground station and a slave ground station.

The measurement is considered to be a signal: - Emitted from the master ground station - Reflected on the spacecraft - Reflected on the slave ground station - Reflected on the spacecraft again - Received on the master ground station Its value is the elapsed time between emission and reception divided by 2c were c is the speed of light. The motion of the stations 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 reflected signal.

Since:

9.0

Author:

Thierry Ceolin, Luc Maisonobe, Maxime Journot

Constructor Summary

Constructors

Constructor and Description
TurnAroundRange(GroundStation masterStation, GroundStation slaveStation, AbsoluteDate date, double turnAroundRange, double sigma, double baseWeight) Simple constructor.
TurnAroundRange(GroundStation masterStation, GroundStation slaveStation, AbsoluteDate date, double turnAroundRange, double sigma, double baseWeight, int propagatorIndex) Simple constructor.

Method Summary

Modifier and Type	Method and Description
GroundStation	getMasterStation() Get the master ground station from which measurement is performed.
GroundStation	getSlaveStation() Get the slave ground station reflecting the signal.
protected EstimatedMeasurement<TurnAroundRange>	theoreticalEvaluation(int iteration, int evaluation, SpacecraftState[] states) Estimate the theoretical value.

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

addModifier, estimate, getBaseWeight, getCoordinates, getDate, getDimension, getModifiers, getObservedValue, getParametersDrivers, getPropagatorsIndices, getTheoreticalStandardDeviation, isEnabled, setEnabled, signalTimeOfFlight, signalTimeOfFlight

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TurnAroundRange

public TurnAroundRange(GroundStation masterStation,
                       GroundStation slaveStation,
                       AbsoluteDate date,
                       double turnAroundRange,
                       double sigma,
                       double baseWeight)
                throws OrekitException

Simple constructor.

This constructor uses 0 as the index of the propagator related to this measurement, thus being well suited for mono-satellite orbit determination.

Parameters:

masterStation - ground station from which measurement is performed

slaveStation - ground station reflecting the signal

date - date of the measurement

turnAroundRange - observed value

sigma - theoretical standard deviation

baseWeight - base weight

Throws:

OrekitException - if a ParameterDriver name conflict occurs

TurnAroundRange

public TurnAroundRange(GroundStation masterStation,
                       GroundStation slaveStation,
                       AbsoluteDate date,
                       double turnAroundRange,
                       double sigma,
                       double baseWeight,
                       int propagatorIndex)
                throws OrekitException

Simple constructor.

Parameters:

masterStation - ground station from which measurement is performed

slaveStation - ground station reflecting the signal

date - date of the measurement

turnAroundRange - observed value

sigma - theoretical standard deviation

baseWeight - base weight

propagatorIndex - index of the propagator related to this measurement

Throws:

OrekitException - if a ParameterDriver name conflict occurs

Since:

9.0

Method Detail

getMasterStation

public GroundStation getMasterStation()

Get the master ground station from which measurement is performed.

Returns:

master ground station from which measurement is performed

getSlaveStation

public GroundStation getSlaveStation()

Get the slave ground station reflecting the signal.

Returns:

slave ground station reflecting the signal

theoreticalEvaluation

protected EstimatedMeasurement<TurnAroundRange> theoreticalEvaluation(int iteration,
                                                                      int evaluation,
                                                                      SpacecraftState[] states)
                                                               throws OrekitException

Estimate the theoretical value.

The theoretical value does not have any modifiers applied.

Specified by:

theoreticalEvaluation in class AbstractMeasurement<TurnAroundRange>

Parameters:

iteration - iteration number

evaluation - evaluation number

states - orbital states at measurement date

Returns:

theoretical value

Throws:

OrekitException - if value cannot be computed

See Also:

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