Package org.orekit.files.iirv

Class IIRVSegment

java.lang.Object

org.orekit.files.iirv.IIRVSegment

All Implemented Interfaces:

EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

public class IIRVSegment
extends Object
implements EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Ephemeris segment from an IIRV file. Each IIRV file (i.e. IIRVMessage) is defined as containing only one IIRVSegment.

Since:

13.0

Author:

Nick LaFarge

Constructor Summary

Constructors

Constructor	Description
IIRVSegment(double mu, int interpolationSamples, int startYear, IIRVMessage iirvMessage)	Constructs a IIRVSegment instance.
IIRVSegment(int startYear, IIRVMessage iirvMessage)	Constructs a IIRVSegment instance with default values.

Method Summary

Modifier and Type	Method	Description
CartesianDerivativesFilter	getAvailableDerivatives()	Get which derivatives of position are available in this ephemeris segment.
List<TimeStampedPVCoordinates>	getCoordinates()	Get the coordinates for this ephemeris segment in EphemerisFile.EphemerisSegment.getFrame().
Frame	getFrame()	Get the reference frame for this ephemeris segment.
IIRVMessage	getIIRVMessage()	Gets the IIRV message for this segment.
int	getInterpolationSamples()	Get the number of samples to use in interpolation.
double	getMu()	Get the standard gravitational parameter for the satellite.
AbsoluteDate	getStart()	Get the start date of this ephemeris segment.
int	getStartYear()	Gets the start year for this segment.
AbsoluteDate	getStop()	Get the end date of this ephemeris segment.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.files.general.EphemerisFile.EphemerisSegment

getInertialFrame, getPropagator, getPropagator

Constructor Details

IIRVSegment

public IIRVSegment(int startYear,
 IIRVMessage iirvMessage)

Constructs a IIRVSegment instance with default values.

Default gravitational parameter is Constants.IERS96_EARTH_MU. Default number of interpolation samples is 7.

Parameters:

startYear - Year associated with the beginning of the IIRV message

iirvMessage - IIRV message consisting of sequential IIRVVector instances, sorted by SequenceNumberTerm.

IIRVSegment

public IIRVSegment(double mu,
 int interpolationSamples,
 int startYear,
 IIRVMessage iirvMessage)

Constructs a IIRVSegment instance.

Parameters:

mu - gravitational parameter (m^3/s^2)

interpolationSamples - number of samples to use in interpolation

startYear - Year associated with the beginning of the IIRV message

iirvMessage - IIRV message consisting of sequential IIRVVector instances, sorted by SequenceNumberTerm.

Method Details

getMu

public double getMu()

Get the standard gravitational parameter for the satellite.

Specified by:

getMu in interface EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Returns:

the gravitational parameter used in EphemerisFile.EphemerisSegment.getPropagator(AttitudeProvider), in m³/s².

getFrame

@DefaultDataContext
public Frame getFrame()

Get the reference frame for this ephemeris segment. The defining frame for EphemerisFile.EphemerisSegment.getCoordinates().

Specified by:

getFrame in interface EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Returns:

the reference frame for this segment. Never null.

getInterpolationSamples

public int getInterpolationSamples()

Get the number of samples to use in interpolation.

Specified by:

getInterpolationSamples in interface EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Returns:

the number of points to use for interpolation.

getAvailableDerivatives

public CartesianDerivativesFilter getAvailableDerivatives()

Get which derivatives of position are available in this ephemeris segment.

While EphemerisFile.EphemerisSegment.getCoordinates() always returns position, velocity, and acceleration the return value from this method indicates which of those are in the ephemeris file and are actually valid.

Specified by:

getAvailableDerivatives in interface EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Returns:

a value indicating if the file contains velocity and/or acceleration data.

getStart

public AbsoluteDate getStart()

Get the start date of this ephemeris segment.

The date returned by this method is equivalent to getPropagator().getMinDate().

Specified by:

getStart in interface EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Returns:

ephemeris segment start date.

getStop

public AbsoluteDate getStop()

Get the end date of this ephemeris segment.

The date returned by this method is equivalent to getPropagator().getMaxDate().

Specified by:

getStop in interface EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Returns:

ephemeris segment end date.

getCoordinates

public List<TimeStampedPVCoordinates> getCoordinates()

Get the coordinates for this ephemeris segment in EphemerisFile.EphemerisSegment.getFrame().

Specified by:

getCoordinates in interface EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Returns:

a list of state vectors in chronological order. The coordinates are not necessarily evenly spaced in time. The value of EphemerisFile.EphemerisSegment.getAvailableDerivatives() indicates if the velocity or accelerations were specified in the file. Any position, velocity, or acceleration coordinates that are not specified in the ephemeris file are zero in the returned values.

getIIRVMessage

public IIRVMessage getIIRVMessage()

Gets the IIRV message for this segment.

Returns:

IIRV message for this segment

getStartYear

public int getStartYear()

Gets the start year for this segment.

Returns:

start year for this segment.