org.orekit.attitudes
Class ConstantSpinSlew

java.lang.Object
  org.orekit.attitudes.AbstractSlew
      org.orekit.attitudes.ConstantSpinSlew

All Implemented Interfaces:

Serializable, AttitudeLeg, AttitudeProvider, Slew

public class ConstantSpinSlew
extends AbstractSlew

This class extends the AbstractSlew.

The Constant spin slew is a "simple" slew that computes the attitude of the satellite using a spherical interpolation of the quaternions representing the starting and ending attitudes.
Some constraints, such as minimal maneuver duration or maximal angular velocity, must be taken into account during the maneuver computation.
Like all the other attitude legs, its interval of validity has closed endpoints.

Since:

1.1

Version:

$Id: ConstantSpinSlew.java 17582 2017-05-10 12:58:16Z bignon $

Author:

Tiziana Sabatini, Julie Anton

See Also:

Serialized Form

Concurrency :

not thread safe

Concurrency comment :

this class is not thread safe because the slew can be re-computed while the method getAttitude(PVCoordinatesProvider, AbsoluteDate, Frame) is called.

Nested Class Summary

static class

ConstantSpinSlew.Constraint Enumeration of the existing constraint types

Field Summary

Fields inherited from class org.orekit.attitudes.AbstractSlew

computed, currentProvider, fLaw, iLaw, intervalOfValidity

Constructor Summary

ConstantSpinSlew(AttitudeProvider initialLaw, AttitudeProvider finalLaw, AbsoluteDate initialDate, AbsoluteDate finalDate)
Builds a ConstantSpinSlew based on a given interval of dates

ConstantSpinSlew(AttitudeProvider initialLaw, AttitudeProvider finalLaw, AbsoluteDate date, boolean isStartDate, double constraintValue, ConstantSpinSlew.Constraint constraintType)
Builds a ConstantSpinSlew from a type of constraint and its value

Method Summary

void	compute(PVCoordinatesProvider pvProv) Compute the slew corresponding to an orbital state.
Attitude	getAttitude(AbsoluteDate date, Frame frame) Compute the attitude.
void	setSpinDerivativesComputation(boolean computeSpinDerivatives) Method to activate spin derivative computation.

Methods inherited from class org.orekit.attitudes.AbstractSlew

getAttitude, getAttitude, getDuration, getTimeInterval

Methods inherited from class java.lang.Object

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

Constructor Detail

ConstantSpinSlew

public ConstantSpinSlew(AttitudeProvider initialLaw,
                        AttitudeProvider finalLaw,
                        AbsoluteDate initialDate,
                        AbsoluteDate finalDate)

Builds a ConstantSpinSlew based on a given interval of dates

Parameters:

initialLaw - initial attitude law

finalLaw - final attitude law

initialDate - initial date

finalDate - final date

ConstantSpinSlew

public ConstantSpinSlew(AttitudeProvider initialLaw,
                        AttitudeProvider finalLaw,
                        AbsoluteDate date,
                        boolean isStartDate,
                        double constraintValue,
                        ConstantSpinSlew.Constraint constraintType)

Builds a ConstantSpinSlew from a type of constraint and its value

Parameters:

initialLaw - initial attitude law

finalLaw - final attitude law

date - begin or end date of the slew

isStartDate - if the date is begin date

constraintValue - value of the constraint : seconds for duration constraint and rad/s for angular velocity contraint

constraintType - type of constraint : duration or angular velocity

Method Detail

compute

public void compute(PVCoordinatesProvider pvProv)
             throws OrekitException

Description copied from interface: Slew

Compute the slew corresponding to an orbital state.

Parameters:

pvProv - : local position-velocity provider around current date

Throws:

OrekitException - orekit exception

getAttitude

public Attitude getAttitude(AbsoluteDate date,
                            Frame frame)
                     throws OrekitException

Description copied from interface: Slew

Compute the attitude.

Parameters:

date - : current date

frame - : reference frame from which attitude is computed

Returns:

attitude : attitude at the specified date

Throws:

OrekitException - orekit exception

setSpinDerivativesComputation

public void setSpinDerivativesComputation(boolean computeSpinDerivatives)

Method to activate spin derivative computation.

Parameters:

computeSpinDerivatives - true if spin derivatives should be computed