Package org.orekit.estimation.measurements.filtering

Class DualFrequencySmoother

java.lang.Object

org.orekit.estimation.measurements.filtering.DualFrequencySmoother

public class DualFrequencySmoother
extends Object

Handler to perform pseudo-range smoothing using Divergence-Free phase combinations.

Since:

11.2

Author:

Louis Aucouturier

Constructor Summary

Constructors

Constructor	Description
DualFrequencySmoother(double threshold, int N)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
ObservationData	copyObservationData(ObservationData obsData)	Copy an ObservationData object.
DualFrequencyHatchFilter	createFilter(ObservationData codeData, ObservationData phaseDataF1, ObservationData phaseDataF2, SatelliteSystem satSystem)	Creates an Hatch filter given initial data.
void	filterDataSet(List<ObservationDataSet> listODS, SatelliteSystem satSystem, int prnNumber, ObservationType obsTypeF1, ObservationType obsTypeF2)	Applies a Dual Frequency Hatch filter to a list of ObservationDataSet.
HashMap<ObservationType,List<SmoothedObservationDataSet>>	getFilteredDataMap()	Get the map of the filtered data.
HashMap<ObservationType,DualFrequencyHatchFilter>	getMapFilters()	Get the map storing the filters for each observation type.

Methods inherited from class java.lang.Object

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

Constructor Detail

DualFrequencySmoother

public DualFrequencySmoother(double threshold,
                             int N)

Simple constructor.

Parameters:

threshold - threshold for loss of lock detection (represents the maximum difference between smoothed and measured values for loss of lock detection)

N - window size of the Hatch Filter

Method Detail

createFilter

public DualFrequencyHatchFilter createFilter(ObservationData codeData,
                                             ObservationData phaseDataF1,
                                             ObservationData phaseDataF2,
                                             SatelliteSystem satSystem)

Creates an Hatch filter given initial data.

Parameters:

codeData - input code observation data

phaseDataF1 - input phase observation data for the first frequency

phaseDataF2 - input phase observation data for the second frequency

satSystem - satellite system corresponding to the observations

Returns:

an Hatch filter for the input data

getFilteredDataMap

public HashMap<ObservationType,List<SmoothedObservationDataSet>> getFilteredDataMap()

Get the map of the filtered data.

Returns:

a map containing the filtered data.

getMapFilters

public final HashMap<ObservationType,DualFrequencyHatchFilter> getMapFilters()

Get the map storing the filters for each observation type.

Returns:

the map storing the filters for each observation type

copyObservationData

public ObservationData copyObservationData(ObservationData obsData)

Copy an ObservationData object.

Parameters:

obsData - observation data to copy

Returns:

a copy of the input observation data

filterDataSet

public void filterDataSet(List<ObservationDataSet> listODS,
                          SatelliteSystem satSystem,
                          int prnNumber,
                          ObservationType obsTypeF1,
                          ObservationType obsTypeF2)

Applies a Dual Frequency Hatch filter to a list of ObservationDataSet.

Parameters:

listODS - input observation data sets

satSystem - satellite System from which to filter the pseudo-range values

prnNumber - PRN identifier to identify the satellite from which to filter the pseudo-range values

obsTypeF1 - observation type to be used as the first frequency for filtering

obsTypeF2 - observation type to be used as the second frequency for filtering