agi.foundation.navigation.datareaders

(agi.foundation.navigation-2026r1.jar)

Class SP3dHeaderRecord

java.lang.Object

agi.foundation.navigation.datareaders.SP3dHeaderRecord

public class SP3dHeaderRecord
extends Object

The SP3-d ephemeris file header definition.

See Also:

SP3dEphemeris

Constructor Summary

Constructors

Constructor and Description
SP3dHeaderRecord() Initializes a new instance of the SP3-d Ephemeris File Header.

Method Summary

Modifier and Type	Method and Description
ArrayList<Integer>	getAccuracies() Gets the orbital accuracy exponent as listed in the header of the SP3-d file.
String	getAgency() Gets the generating agency from Line 1.
double	getClockStandardDeviationBase() Gets the base number used in the calculation of the clock correction and clock correction rate standard deviations.
String	getComment() Gets the comment lines from the header of the SP3-d file.
String	getCoordinateSystem() Gets the coordinate system from Line 1.
String	getDataUsedDescriptor() Gets the Data Used Descriptor from Line 1.
double	getEpochInterval() Gets the epoch interval from Line 2.
char	getFileTypeDescriptor() Gets the file type descriptor which denotes the type of data included in this SP3-d file.
int	getNumberOfEpochs() Gets the number of epochs listed in this file from Line 1.
int	getNumberOfSats() Gets the number of satellites contained in this file from Line 3.
String	getOrbitType() Gets the orbit type from Line 1.
String	getPositionVelocityFlag() Gets the Position/Velocity Flag from Line 1.
double	getPVStandardDeviationBase() Gets the base number used in the calculation of the Position and Velocity standard deviations.
ArrayList<SatelliteIdentifier>	getSatelliteIdentifiers() Gets the satellite identifiers as listed in the header of the SP3-d file.
JulianDate	getStartEpoch() Gets the Start epoch from Line 1.
GlobalPositioningSystemDate	getStartEpochGps() Gets the start epoch in GPS time format from Line 2.
double	getStartFractionalDay() Gets the start epoch fractional day from Line 2.
int	getStartModifiedJulianDate() Gets the start epoch modified Julian date from Line 2.
String	getTimeReference() Gets the time standard all data in the SP3-d file is referenced to.
TimeStandard	getTimeStandard() Gets the Time Standard used in this SP3-d Ephemeris file.
String	getVersion() Gets the version of this file from Line 1.

Methods inherited from class java.lang.Object

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

Constructor Detail

SP3dHeaderRecord

public SP3dHeaderRecord()

Initializes a new instance of the SP3-d Ephemeris File Header.

Method Detail

getVersion

public final String getVersion()

Gets the version of this file from Line 1.

getPositionVelocityFlag

public final String getPositionVelocityFlag()

Gets the Position/Velocity Flag from Line 1.

getStartEpoch

@Nonnull
public final JulianDate getStartEpoch()

Gets the Start epoch from Line 1.

getNumberOfEpochs

public final int getNumberOfEpochs()

Gets the number of epochs listed in this file from Line 1.

getDataUsedDescriptor

public final String getDataUsedDescriptor()

Gets the Data Used Descriptor from Line 1.

getCoordinateSystem

public final String getCoordinateSystem()

Gets the coordinate system from Line 1.

getOrbitType

public final String getOrbitType()

Gets the orbit type from Line 1.

getAgency

public final String getAgency()

Gets the generating agency from Line 1.

getStartEpochGps

@Nonnull
public final GlobalPositioningSystemDate getStartEpochGps()

Gets the start epoch in GPS time format from Line 2.

getEpochInterval

public final double getEpochInterval()

Gets the epoch interval from Line 2.

getStartModifiedJulianDate

public final int getStartModifiedJulianDate()

Gets the start epoch modified Julian date from Line 2.

getStartFractionalDay

public final double getStartFractionalDay()

Gets the start epoch fractional day from Line 2.

getNumberOfSats

public final int getNumberOfSats()

Gets the number of satellites contained in this file from Line 3.

getSatelliteIdentifiers

@Nonnull
public final ArrayList<SatelliteIdentifier> getSatelliteIdentifiers()

Gets the satellite identifiers as listed in the header of the SP3-d file. For GPS satellites, these are the Pseudo Random Noise numbers and GPS constellation identifiers.

getAccuracies

@Nonnull
public final ArrayList<Integer> getAccuracies()

Gets the orbital accuracy exponent as listed in the header of the SP3-d file. The accuracy is interpreted as 2**exponent meters. An exponent value of 0 indicates the accuracy is unknown. The accuracies are ordered identically to the satellite identifier ordering in SatelliteIdentifiers (get).

getFileTypeDescriptor

public final char getFileTypeDescriptor()

Gets the file type descriptor which denotes the type of data included in this SP3-d file. The SP3-d definition defines the types allowed:

• 'G' denotes data from the GPS constellation
• 'M' denotes data from mixed constellations/satellites
• 'R' denotes data from the GLONASS constellation
• 'L' denotes data from LEO satellites
• 'E' denotes data from the Galileo constellation

See NASA's Archive of Space Geodesy Data for a list of LEO descriptors.

getTimeReference

public final String getTimeReference()

Gets the time standard all data in the SP3-d file is referenced to. The SP3-d definition defines the types allowed:

• "GPS" denotes GPS time
• "GLO" denotes GLONASS UTC time
• "GAL" denotes Galileo system time
• "TAI" denotes international atomic time
• "UTC" denotes Universal time.

getPVStandardDeviationBase

public final double getPVStandardDeviationBase()

Gets the base number used in the calculation of the Position and Velocity standard deviations. The standard deviation calculations are defined in the SP3-d definition.

getClockStandardDeviationBase

public final double getClockStandardDeviationBase()

Gets the base number used in the calculation of the clock correction and clock correction rate standard deviations. The standard deviation calculations are defined in the SP3-d definition.

getComment

public final String getComment()

Gets the comment lines from the header of the SP3-d file.

getTimeStandard

@Nonnull
public final TimeStandard getTimeStandard()

Gets the Time Standard used in this SP3-d Ephemeris file.