Package org.orekit.files.stk

Class STKEphemerisFile.STKEphemerisSegment

java.lang.Object

org.orekit.files.stk.STKEphemerisFile.STKEphemerisSegment

All Implemented Interfaces:

EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Enclosing class:

STKEphemerisFile

public static class STKEphemerisFile.STKEphemerisSegment
extends Object
implements EphemerisFile.EphemerisSegment<TimeStampedPVCoordinates>

Ephemeris segment from an STK ephemeris file.

Constructor Summary

Constructors

Constructor	Description
STKEphemerisSegment(double mu, Frame frame, int interpolationSamples, CartesianDerivativesFilter cartesianDerivativesFilter, List<TimeStampedPVCoordinates> timeStampedPVCoordinates)	Constructs a STKEphemerisFile.STKEphemerisSegment instance.

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.
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.
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

STKEphemerisSegment

public STKEphemerisSegment(double mu,
 Frame frame,
 int interpolationSamples,
 CartesianDerivativesFilter cartesianDerivativesFilter,
 List<TimeStampedPVCoordinates> timeStampedPVCoordinates)

Constructs a STKEphemerisFile.STKEphemerisSegment instance.

Parameters:

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

frame - frame

interpolationSamples - number of samples to use in interpolation

cartesianDerivativesFilter - Cartesian derivatives filter

timeStampedPVCoordinates - time-sorted time/position/velocity data

Method Details

getMu

public double getMu()

Description copied from interface: EphemerisFile.EphemerisSegment

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

public Frame getFrame()

Description copied from interface: EphemerisFile.EphemerisSegment

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()

Description copied from interface: EphemerisFile.EphemerisSegment

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()

Description copied from interface: EphemerisFile.EphemerisSegment

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.

getCoordinates

public List<TimeStampedPVCoordinates> getCoordinates()

Description copied from interface: EphemerisFile.EphemerisSegment

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.

getStart

public AbsoluteDate getStart()

Description copied from interface: EphemerisFile.EphemerisSegment

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()

Description copied from interface: EphemerisFile.EphemerisSegment

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.