User Manual 3.3 Slew - Historique des versions

Admin : /* Package Overview */

2018-02-28T15:21:45Z

Package Overview

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	A slew is represented by the abstract class <code>AbstractSlew</code>, which implements the interface <code>Slew</code>. An slew describes how the spacecraft joins up two successive attitude laws: the classes heriting from <code>AbstractSlew</code> (like the class <code>ConstantSpinSlew</code>) contain the algorithms to compute the maneuver.		A slew is represented by the abstract class <code>AbstractSlew</code>, which implements the interface <code>Slew</code>. An slew describes how the spacecraft joins up two successive attitude laws: the classes heriting from <code>AbstractSlew</code> (like the class <code>ConstantSpinSlew</code>) contain the algorithms to compute the maneuver.

	A slew is bounded in time and as a result inherits the [~~ATT_LEG_Home~~ AttitudeLeg] interface.		A slew is bounded in time and as a result inherits the [[User Manual 3.3 Attitude leg\|AttitudeLeg]] interface.

	== Features ==		== Features ==

Admin : /* Contents */

2018-02-27T07:58:39Z

Contents

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	\|'''TwoSpinBiasSlew'''		\|'''TwoSpinBiasSlew'''
	\|This class implements the spin bias slew profile with two available spin profiles.		\|This class implements the spin bias slew profile with two available spin profiles.
	\|[{{JavaDoc3.3}}/org/orekit~~/attitudes~~/attitudes/TwoSpinBiasSlew.html TwoSpinBiasSlew]		\|[{{JavaDoc3.3}}/org/orekit/attitudes/TwoSpinBiasSlew.html TwoSpinBiasSlew]
	\|-		\|-
	\|'''IsisAnalyticalSpinBiasSlew'''		\|'''IsisAnalyticalSpinBiasSlew'''

Admin : /* Contents */

2018-02-27T07:56:32Z

Contents

@@ Ligne 82 : / Ligne 82 : @@
 == Contents ==
 === Interfaces ===
-|=(% colspan="3" %)Interface|=(% colspan="6" %)Summary|=(% colspan="1" %)Javadoc
+{| class="wikitable"
-|(% colspan="3" %)'''AttitudeLeg'''|(% colspan="6" %)This interface extends the AttitudeProvider interface and adds the time interval of validity notion to the attitude laws.|[{{JavaDoc3.3}}/org/orekit/attitudes/AttitudeLeg.html AttitudeLeg]
+|-
-|(% colspan="3" %)'''Slew'''|(% colspan="6" %)This interface implements a generic slew model set.|[{{JavaDoc3.3}}/org/orekit/attitudes/Slew.html Slew]
+! scope="col"| Interface
 === Classes ===
-|=(% colspan="3" %)Class|=(% colspan="6" %)Summary|=(% colspan="1" %)Javadoc
+{| class="wikitable"
-|(% colspan="3" %)'''AbstractSlew'''|(% colspan="6" %)This abstract class implements slew maneuvers.|[{{JavaDoc3.3}}/org/orekit/attitudes/AbstractSlew.html AbstractSlew]
+|-
-|(% colspan="3" %)'''ConstantSpinSlew'''|(% colspan="6" %)This class implements the constant spin slew maneuver profile.|[{{JavaDoc3.3}}/org/orekit/attitudes/ConstantSpinSlew.html ConstantSpinSlew]
+! scope="col"| Class
-|(% colspan="3" %)'''TwoSpinBiasSlew'''|(% colspan="6" %)This class implements the spin bias slew profile with two available spin profiles.|[{{JavaDoc3.3}}/org/orekit/attitudes/TwoSpinBiasSlew.html TwoSpinBiasSlew]
+! scope="col"| Summary
-|(% colspan="3" %)'''IsisAnalyticalSpinBiasSlew'''|(% colspan="6" %)This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Analytical solution).|[{{JavaDoc3.3}}/org/orekit/attitudes/IsisAnalyticalSpinBiasSlew.html IsisAnalyticalSpinBiasSlew]
+! scope="col"| Javadoc
-|(% colspan="3" %)'''IsisNumericalSpinBiasSlew'''|(% colspan="6" %)This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Numerical solution).|[{{JavaDoc3.3}}/org/orekit/attitudes/IsisNumericalSpinBiasSlew.html IsisNumericalSpinBiasSlew]
+|-
 == Tutorials ==

Admin : /* Constant spin slew */

2018-02-27T07:52:59Z

Constant spin slew

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	* Minimal duration:		* Minimal duration:
	** the initial and final date of the slew maneuver are given:		** the initial and final date of the slew maneuver are given:<br><syntaxhighlight lang="java">
	<syntaxhighlight lang="java">
	final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, startDate, endDate); </syntaxhighlight>		final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, startDate, endDate); </syntaxhighlight>
	** the initial date of the slew maneuver and its duration are given:		** the initial date of the slew maneuver and its duration are given:<br><syntaxhighlight lang="java">
	<syntaxhighlight lang="java">
	final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, startDate, true, 150., Constraint.DURATION);</syntaxhighlight>		final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, startDate, true, 150., Constraint.DURATION);</syntaxhighlight>
	** the final date of the slew maneuver and its duration are given:		** the final date of the slew maneuver and its duration are given:<br><syntaxhighlight lang="java">
	<syntaxhighlight lang="java">
	final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, endDate, false, 150., Constraint.DURATION);</syntaxhighlight>		final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, endDate, false, 150., Constraint.DURATION);</syntaxhighlight>
	* Maximal angular velocity:		* Maximal angular velocity:
	** the initial (or final) date of the slew maneuver and the maximal angular velocity are given:		** the initial (or final) date of the slew maneuver and the maximal angular velocity are given:<br><syntaxhighlight lang="java">
	<syntaxhighlight lang="java">
	final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, startDate, true, 0.2, Constraint.ANGULAR_VELOCITY);</syntaxhighlight>		final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, startDate, true, 0.2, Constraint.ANGULAR_VELOCITY);</syntaxhighlight>

Admin : /* Introduction */

2018-02-27T07:51:31Z

Introduction

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	The attitude objects linked to slews are available in the package org.orekit.attitudes in the Orekit add-ons library.		The attitude objects linked to slews are available in the package org.orekit.attitudes in the Orekit add-ons library.

	\|=~~(% colspan~~="3" %)Library~~\|=(% colspan~~="6" %)Javadoc		{\| class="wikitable"
	\|~~(% colspan="3" %)~~Orekit addons\|~~(% colspan="6" %)~~[{{JavaDoc3.3}}/org/orekit/attitudes/package-summary.html Package org.orekit.attitudes]		\|-
			! scope="col"\| Library
			! scope="col"\| Javadoc
			\|-
			\|Orekit addons
			\|[{{JavaDoc3.3}}/org/orekit/attitudes/package-summary.html Package org.orekit.attitudes]
			\|}

	=== Links ===		=== Links ===

Admin : Admin a déplacé la page Slew vers User Manual 3.3 Slew sans laisser de redirection

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Admin a déplacé la page Slew vers User Manual 3.3 Slew sans laisser de redirection

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Nouvelle page

== Introduction ==
=== Scope ===
A slew performs the transition between two attitude laws.

=== Javadoc ===
The attitude objects linked to slews are available in the package org.orekit.attitudes in the Orekit add-ons library.

|=(% colspan="3" %)Library|=(% colspan="6" %)Javadoc
|(% colspan="3" %)Orekit addons|(% colspan="6" %)[{{JavaDoc3.3}}/org/orekit/attitudes/package-summary.html Package org.orekit.attitudes]

=== Links ===
None as of now.

=== Useful Documents ===
None as of now.

=== Package Overview ===
The slew conception is described hereafter :

[[File:slewdiagram2.png|center]]

Legend :

* green : new objects
* grey : modified existing objects
* blue : existing objects

A slew is represented by the abstract class <code>AbstractSlew</code>, which implements the interface <code>Slew</code>. An slew describes how the spacecraft joins up two successive attitude laws: the classes heriting from <code>AbstractSlew</code> (like the class <code>ConstantSpinSlew</code>) contain the algorithms to compute the maneuver.

A slew is bounded in time and as a result inherits the [ATT_LEG_Home AttitudeLeg] interface.

== Features ==
=== Constant spin slew ===
The constant spin slew is a basic slew maneuver type. Between the initial quaternion and the final one, a spherical linear interpolation ([MAT_QRO_Rotations slerp interpolation]) describes the behavior of the spacecraft.
In order to properly compute the slew, the user must specify the initial and final quaternion, plus a computation constraint:

* Minimal duration:
** the initial and final date of the slew maneuver are given:
<syntaxhighlight lang="java">
final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, startDate, endDate); </syntaxhighlight>
** the initial date of the slew maneuver and its duration are given:
<syntaxhighlight lang="java">
final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, startDate, true, 150., Constraint.DURATION);</syntaxhighlight>
** the final date of the slew maneuver and its duration are given:
<syntaxhighlight lang="java">
final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, endDate, false, 150., Constraint.DURATION);</syntaxhighlight>
* Maximal angular velocity:
** the initial (or final) date of the slew maneuver and the maximal angular velocity are given:
<syntaxhighlight lang="java">
final Slew slew = new ConstantSpinSlew(firstLaw, secondLaw, startDate, true, 0.2, Constraint.ANGULAR_VELOCITY);</syntaxhighlight>

Once the slew maneuver defined, the computation can be performed on an orbital state using the following method:
<syntaxhighlight lang="java">
slew.compute(orbit);
</syntaxhighlight>

=== Spin bias slew ===
The two spin bias slew is a slew maneuver type. The velocity depends on the value of the slew angle.

In order to compute properly the slew, the user must specify the initial and final laws, the parameters of the two angular velocity fields, plus the stabilisation margin:

<syntaxhighlight lang="java">final TwoSpinBiasSlew slew = new TwoSpinBiasSlew(startLaw, finalLaw, initialDate,
step, theta_max, tau, epsInRall, omega2, theta, epsOutRall, omega1, dtStab);</syntaxhighlight>

Once the slew maneuver is defined, the computation can be performed on an orbital state using the following method:
<syntaxhighlight lang="java">
slew.compute(orbit);
</syntaxhighlight>

It is possible to get the attitude ephemeris representing the slew using the following method:
<syntaxhighlight lang="java">
final TabulatedAttitude ephem = slew.getEphemeris();
</syntaxhighlight>

== Getting Started ==
{{specialInclusion prefix=$theme_sub section="GettingStarted"/}}

== Contents ==
=== Interfaces ===
|=(% colspan="3" %)Interface|=(% colspan="6" %)Summary|=(% colspan="1" %)Javadoc
|(% colspan="3" %)'''AttitudeLeg'''|(% colspan="6" %)This interface extends the AttitudeProvider interface and adds the time interval of validity notion to the attitude laws.|[{{JavaDoc3.3}}/org/orekit/attitudes/AttitudeLeg.html AttitudeLeg]
|(% colspan="3" %)'''Slew'''|(% colspan="6" %)This interface implements a generic slew model set.|[{{JavaDoc3.3}}/org/orekit/attitudes/Slew.html Slew]

=== Classes ===
|=(% colspan="3" %)Class|=(% colspan="6" %)Summary|=(% colspan="1" %)Javadoc
|(% colspan="3" %)'''AbstractSlew'''|(% colspan="6" %)This abstract class implements slew maneuvers.|[{{JavaDoc3.3}}/org/orekit/attitudes/AbstractSlew.html AbstractSlew]
|(% colspan="3" %)'''ConstantSpinSlew'''|(% colspan="6" %)This class implements the constant spin slew maneuver profile.|[{{JavaDoc3.3}}/org/orekit/attitudes/ConstantSpinSlew.html ConstantSpinSlew]
|(% colspan="3" %)'''TwoSpinBiasSlew'''|(% colspan="6" %)This class implements the spin bias slew profile with two available spin profiles.|[{{JavaDoc3.3}}/org/orekit/attitudes/TwoSpinBiasSlew.html TwoSpinBiasSlew]
|(% colspan="3" %)'''IsisAnalyticalSpinBiasSlew'''|(% colspan="6" %)This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Analytical solution).|[{{JavaDoc3.3}}/org/orekit/attitudes/IsisAnalyticalSpinBiasSlew.html IsisAnalyticalSpinBiasSlew]
|(% colspan="3" %)'''IsisNumericalSpinBiasSlew'''|(% colspan="6" %)This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Numerical solution).|[{{JavaDoc3.3}}/org/orekit/attitudes/IsisNumericalSpinBiasSlew.html IsisNumericalSpinBiasSlew]

== Tutorials ==
=== Tutorial 1 ===
{{specialInclusion prefix=$theme_sub section="Tuto1"/}}

=== Tutorial 2 ===
{{specialInclusion prefix=$theme_sub section="Tuto2"/}}

== [[File:lightBulb.png]] Tips & Tricks ==
{{specialInclusion prefix=$theme_sub section="Tips"/}}

User Manual 3.3 Slew - Historique des versions

Admin : /* Package Overview */

Admin : /* Contents */

Admin : /* Contents */

Admin : /* Constant spin slew */

Admin : /* Introduction */

Admin : Admin a déplacé la page Slew vers User Manual 3.3 Slew sans laisser de redirection

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Admin le 27 février 2018 à 07:49

Admin : /* Package Overview */

Admin : /* Contents */

Admin : /* Contents */

Admin : /* Constant spin slew */

Admin : /* Introduction */

Admin : Admin a déplacé la page Slew vers User Manual 3.3 Slew sans laisser de redirection

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