Class FDOA
- java.lang.Object
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- org.orekit.estimation.measurements.AbstractMeasurement<T>
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- org.orekit.estimation.measurements.GroundReceiverMeasurement<FDOA>
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- org.orekit.estimation.measurements.FDOA
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- All Implemented Interfaces:
Comparable<ComparableMeasurement>
,ComparableMeasurement
,ObservedMeasurement<FDOA>
,TimeStamped
,ParameterDriversProvider
public class FDOA extends GroundReceiverMeasurement<FDOA>
Class modeling a Frequency Difference of Arrival measurement with a satellite as emitter and two ground stations as receivers.FDOA measures the difference in signal arrival frequency between the emitter and receivers, corresponding to a difference in range-rate from the two receivers to the emitter.
The date of the measurement corresponds to the reception of the signal by the prime station. The measurement corresponds to the frequency of the signal received at the prime station at the date of the measurement minus the frequency of the signal received at the second station:
fdoa = f1 - f2
The motion of the stations and the satellite during the signal flight time are taken into account.
- Since:
- 12.0
- Author:
- Mark Rutten
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Field Summary
Fields Modifier and Type Field Description static String
MEASUREMENT_TYPE
Type of the measurement.
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Constructor Summary
Constructors Constructor Description FDOA(GroundStation primeStation, GroundStation secondStation, double centreFrequency, AbsoluteDate date, double fdoa, double sigma, double baseWeight, ObservableSatellite satellite)
Simple constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description GroundStation
getPrimeStation()
Get the prime ground station, the one that gives the date of the measurement.GroundStation
getSecondStation()
Get the second ground station, the one that gives the measurement.protected EstimatedMeasurement<FDOA>
theoreticalEvaluation(int iteration, int evaluation, SpacecraftState[] states)
Estimate the theoretical value.protected EstimatedMeasurementBase<FDOA>
theoreticalEvaluationWithoutDerivatives(int iteration, int evaluation, SpacecraftState[] states)
Estimate the theoretical value without derivatives.-
Methods inherited from class org.orekit.estimation.measurements.GroundReceiverMeasurement
computeCommonParametersWithDerivatives, computeCommonParametersWithout, getGroundStationCoordinates, getGroundStationPosition, getStation, isTwoWay
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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
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.orekit.estimation.measurements.ComparableMeasurement
compareTo
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Methods inherited from interface org.orekit.estimation.measurements.ObservedMeasurement
estimateWithoutDerivatives, getMeasurementType
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Methods inherited from interface org.orekit.utils.ParameterDriversProvider
getNbParametersDriversValue, getParameterDriver, getParameters, getParameters, getParameters, getParameters, getParametersAllValues, getParametersAllValues, isSupported
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Methods inherited from interface org.orekit.time.TimeStamped
durationFrom
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Field Detail
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MEASUREMENT_TYPE
public static final String MEASUREMENT_TYPE
Type of the measurement.- See Also:
- Constant Field Values
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Constructor Detail
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FDOA
public FDOA(GroundStation primeStation, GroundStation secondStation, double centreFrequency, AbsoluteDate date, double fdoa, double sigma, double baseWeight, ObservableSatellite satellite)
Simple constructor.- Parameters:
primeStation
- ground station that gives the date of the measurementsecondStation
- ground station that gives the measurementcentreFrequency
- satellite emitter frequency (Hz)date
- date of the measurementfdoa
- observed value (Hz)sigma
- theoretical standard deviationbaseWeight
- base weightsatellite
- satellite related to this measurement
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Method Detail
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getPrimeStation
public GroundStation getPrimeStation()
Get the prime ground station, the one that gives the date of the measurement.- Returns:
- prime ground station
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getSecondStation
public GroundStation getSecondStation()
Get the second ground station, the one that gives the measurement.- Returns:
- second ground station
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theoreticalEvaluationWithoutDerivatives
protected EstimatedMeasurementBase<FDOA> 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 classAbstractMeasurement<FDOA>
- Parameters:
iteration
- iteration numberevaluation
- evaluation numberstates
- orbital states at measurement date- Returns:
- theoretical value
- See Also:
AbstractMeasurement.estimate(int, int, SpacecraftState[])
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theoreticalEvaluation
protected EstimatedMeasurement<FDOA> theoreticalEvaluation(int iteration, int evaluation, SpacecraftState[] states)
Estimate the theoretical value.The theoretical value does not have any modifiers applied.
- Specified by:
theoreticalEvaluation
in classAbstractMeasurement<FDOA>
- Parameters:
iteration
- iteration numberevaluation
- evaluation numberstates
- orbital states at measurement date- Returns:
- theoretical value
- See Also:
AbstractMeasurement.estimate(int, int, SpacecraftState[])
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