User Manual 4.5 Slew - Historique des versions

Admin : /* Constant spin slew */

2020-05-19T14:53:38Z

Constant spin slew

← Version précédente		Version du 19 mai 2020 à 14:53
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	Two constraint types are available:		Two constraint types are available:
	* Duration constraint: spin is computed to match constraint.		* Duration constraint: spin is computed to match constraint.
	<~~code~~>final Slew slew = new ConstantSpinSlew(firstAttitude, secondAttitude);</~~code~~>		<syntaxhighlight lang="java">final Slew slew = new ConstantSpinSlew(firstAttitude, secondAttitude);</syntaxhighlight>
	* Angular velocity constraint: initial slew date or final slew date is computed to match constraint.		* Angular velocity constraint: initial slew date or final slew date is computed to match constraint.
	** Initial slew date is known:		** Initial slew date is known:
	<~~code~~>final Slew slew = new ConstantSpinSlewComputer(angularConstraint).compute(pvProvider, initialLaw, initialDate, finalLaw, null);</~~code~~>		<syntaxhighlight lang="java">final Slew slew = new ConstantSpinSlewComputer(angularConstraint).compute(pvProvider, initialLaw, initialDate, finalLaw, null);</syntaxhighlight>
	** Final slew date is known:		** Final slew date is known:
	<~~code~~>final Slew slew = new ConstantSpinSlewComputer(angularConstraint).compute(pvProvider, initialLaw, null, finalLaw, finalDate);</~~code~~>		<syntaxhighlight lang="java">final Slew slew = new ConstantSpinSlewComputer(angularConstraint).compute(pvProvider, initialLaw, null, finalLaw, finalDate);</syntaxhighlight>

	=== Spin bias slew ===		=== Spin bias slew ===

Admin : /* Constant spin slew */

2020-05-19T14:52:32Z

Constant spin slew

← Version précédente		Version du 19 mai 2020 à 14:52
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	== Features ==		== Features ==
	=== Constant spin slew ===		=== 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.		The constant spin slew is a basic slew maneuver type. Between the initial quaternion and the final one, a spherical linear 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:		Two constraint types are available:
			* Duration constraint: spin is computed to match constraint.
	* ~~Minimal duration~~:		<code>final Slew slew = new ConstantSpinSlew(firstAttitude, secondAttitude);</code>
	** the initial and final date of the slew maneuver are given:<br>~~<syntaxhighlight lang="java">~~		* Angular velocity constraint: initial slew date or final slew date is computed to match constraint.
	final Slew slew = new ConstantSpinSlew(~~firstLaw~~, ~~secondLaw, startDate, endDate~~); </~~syntaxhighlight~~>		** Initial slew date is known:
	** the initial date ~~of the slew maneuver and its duration are given:<br><syntaxhighlight lang="java">~~		<code>final Slew slew = new ConstantSpinSlewComputer(angularConstraint).compute(pvProvider, initialLaw, initialDate, finalLaw, null);</code>
	final ~~Slew~~ slew ~~= new ConstantSpinSlew(firstLaw, secondLaw, startDate, true, 150~~.~~, Constraint.DURATION);</syntaxhighlight>~~		** Final slew date is known:
	** ~~the final~~ date ~~of the slew maneuver and its duration are given~~:<br>~~<syntaxhighlight lang="java">~~		<code>final Slew slew = new ConstantSpinSlewComputer(angularConstraint).compute(pvProvider, initialLaw, null, finalLaw, finalDate);</code>
	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~~:<br>~~<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 ===		=== Spin bias slew ===

Admin : /* ISIS Spin bias slew */

2020-05-11T13:29:49Z

ISIS Spin bias slew

← Version précédente		Version du 11 mai 2020 à 13:29
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	[[File:ISISSpin2.png\|center]]		[[File:ISISSpin2.png\|center]]

	This slew can be computed using ~~classes~~:<br>		This slew can be computed using methods:<br>
	- <code>~~IsisAnalyticalSpinBiasSlew~~</code>: this class provides an analytical solution to the slew<br>		- <code>IsisSpinBiasSlewComputer.computeAnalytical</code>: this class provides an analytical solution to the slew<br>
	- <code>~~IsisNumericalSpinBiasSlew~~</code>: this class provides an numerical solution to the slew		- <code>IsisSpinBiasSlewComputer.computeNumerical</code>: this class provides an numerical solution to the slew
	The two classes returns close results ( < 1E-2 rad), though analytical solution is more accurate.		The two classes returns close results ( < 1E-2 rad), though analytical solution is more accurate.

	The slews can be used in two ways:<br>		The slews can be used in two ways:<br>
	- Provide an initial law, an initial date and a target final law~~: the user must use the enum <code>TypeOfDate.INITIAL</code> at construction.~~<br>		- Provide an initial law, an initial date and a target final law<br>
	- Provide an final law, a final date and a target initial law~~: the user must use the enum <code>TypeOfDate.FINAL</code> at construction.~~<br><br>		- Provide an final law, a final date and a target initial law<br><br>
	'''Warning''': slew computed in both ways will never be exactly the same depending on user-chosen convergence threshold and maximum number of iterations (result will be exactly the same if convergence threshold is lower than machine precision and number of allowed iterations high enough to support convergence).		'''Warning''': slew computed in both ways will never be exactly the same depending on user-chosen convergence threshold and maximum number of iterations (result will be exactly the same if convergence threshold is lower than machine precision and number of allowed iterations high enough to support convergence).

	The slew has then to be calculated using method <code>compute()</code>.		The slew has then to be calculated using method <code>compute()</code>.
			The slew is then represented by a generic <code>TabulatedSlew</code> which stores the slew under a tabulated ephemeris.
	Finally the slew can be used like any other slew.		Finally the slew can be used like any other slew.

Admin : /* Spin bias slew */

2020-05-11T13:27:32Z

Spin bias slew

← Version précédente		Version du 11 mai 2020 à 13:27
Ligne 58 :		Ligne 58 :
	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:		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,~~		<syntaxhighlight lang="java">final TwoSpinBiasSlewComputer computer = new TwoSpinBiasSlewComputer(
	step, theta_max, tau, epsInRall, omega2, theta, epsOutRall, omega1, dtStab);</syntaxhighlight>		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:		Once the slew maneuver is defined, the computation can be performed on an orbital state using the following method:
	<syntaxhighlight lang="java">		<syntaxhighlight lang="java">
	slew.compute(~~orbit~~);		final TabulatedSlew slew = computer.compute(startLaw, initialDate, finalLaw, null);
	</syntaxhighlight>		</syntaxhighlight>

	It is ~~possible to get the attitude ephemeris representing the slew using the following method:~~		The slew is then represented by a generic <code>TabulatedSlew</code> which stores the slew under a tabulated ephemeris.
	<~~syntaxhighlight lang="java"~~>
	~~final TabulatedAttitude ephem = slew.getEphemeris();~~
	</~~syntaxhighlight~~>

	=== ISIS Spin bias slew ===		=== ISIS Spin bias slew ===

Admin : /* Package Overview */

2020-05-11T13:24:53Z

Package Overview

← Version précédente		Version du 11 mai 2020 à 13:24
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	=== Package Overview ===		=== Package Overview ===
	The slew conception is split into two features:		The slew conception is split into two features:
	* The slew computation.		* The slew computation. Classes ''computing'' the slew are provided in PATRIUS.
	* The slew realization. All classes realizing a slew implements the <code>Slew</code> interface. Slews are mainly of two types:		* The slew realization. All classes realizing a slew implements the <code>Slew</code> interface. Slews are mainly of two types:
	** Analytical slews (such as <code>ConstantSpinSlew</code>		** Analytical slews (such as <code>ConstantSpinSlew</code>

Admin : /* Package Overview */

2020-05-11T13:24:03Z

Package Overview

← Version précédente		Version du 11 mai 2020 à 13:24
Ligne 23 :		Ligne 23 :

	=== Package Overview ===		=== Package Overview ===
	The slew conception is ~~described hereafter~~ :		The slew conception is split into two features:
			* The slew computation.
	~~[[File:~~slew.~~jpg\|center]]~~		* The slew realization. All classes realizing a slew implements the <code>Slew</code> interface. Slews are mainly of two types:
			** Analytical slews (such as <code>ConstantSpinSlew</code>
			** Pre-computed slews stored in a <code>TabulatedSlew</code>. In this case, a slew ''computer'' will compute the tabulated ephemeris of the slew.
	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 [ATT_LEG_Home AttitudeLeg] interface.

Admin : /* Classes */

2020-05-11T13:20:42Z

Classes

← Version précédente		Version du 11 mai 2020 à 13:20
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	=== Classes ===		=== Classes ===

			As of 4.5, some classes have been deprecated and should therefore not be used any more.

	{\| class="wikitable"		{\| class="wikitable"
Ligne 123 :		Ligne 125 :
	\|-		\|-
	\|'''AbstractSlew'''		\|'''AbstractSlew'''
	\|This abstract class implements slew maneuvers.		\|This abstract class implements slew maneuvers (deprecated).
	\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/AbstractSlew.html AbstractSlew]		\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/AbstractSlew.html AbstractSlew]
	\|-		\|-
	\|'''ConstantSpinSlew'''		\|'''ConstantSpinSlew'''
	\|This class implements the constant spin slew maneuver profile.		\|This class implements the constant spin slew maneuver profile (current usage is deprecated, not the class itself).
	\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/ConstantSpinSlew.html ConstantSpinSlew]		\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/ConstantSpinSlew.html ConstantSpinSlew]
	\|-		\|-
	\|'''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 (deprecated).
	\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/TwoSpinBiasSlew.html TwoSpinBiasSlew]		\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/TwoSpinBiasSlew.html TwoSpinBiasSlew]
	\|-		\|-
	\|'''IsisAnalyticalSpinBiasSlew'''		\|'''IsisAnalyticalSpinBiasSlew'''
	\|This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Analytical solution).		\|This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Analytical solution) (deprecated).
	\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/IsisAnalyticalSpinBiasSlew.html IsisAnalyticalSpinBiasSlew]		\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/IsisAnalyticalSpinBiasSlew.html IsisAnalyticalSpinBiasSlew]
	\|-		\|-
	\|'''IsisNumericalSpinBiasSlew'''		\|'''IsisNumericalSpinBiasSlew'''
	\|This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Numerical solution).		\|This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Numerical solution) (deprecated).
	\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/IsisNumericalSpinBiasSlew.html IsisNumericalSpinBiasSlew]		\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/IsisNumericalSpinBiasSlew.html IsisNumericalSpinBiasSlew]
			\|-
			\|'''TabulatedSlew'''
			\|This class implements a generic tabulated slew, once computed with one of the computer classes.
			\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/TabulatedSlew.html TabulatedSlew]
			\|-
			\|'''AngularVelocitiesPolynomialSlew'''
			\|This class implements a generic angular velocities polynomial slew.
			\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/AngularVelocitiesPolynomialSlew.html AngularVelocitiesPolynomialSlew]
			\|-
			\|'''ConstantSpinSlewComputer'''
			\|This class computes a constant spin slew into a ConstantSpinSlew.
			\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/slew/ConstantSpinSlewComputer.html ConstantSpinSlewComputer]
			\|-
			\|'''TwoSpinBiasSlewComputer'''
			\|This class computes a two spin bias slew into a TabulatedSlew.
			\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/slew/TwoSpinBiasSlewComputer.html TwoSpinBiasSlewComputer]
			\|-
			\|'''IsisSpinBiasSlewComputer'''
			\|This class computes an ISIS spin bias slew into a TabulatedSlew.
			\|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/slew/IsisSpinBiasSlewComputer.html IsisSpinBiasSlewComputer]
	\|}		\|}

	[[Category:User_Manual_4.5_Attitude]]		[[Category:User_Manual_4.5_Attitude]]

Admin : Page créée avec « NOTOC == Introduction == === Scope === A slew performs the transition between two attitude laws. === Javadoc === The attitude objects linked to slews are available i... »

2020-05-02T12:38:11Z

Page créée avec « __NOTOC__ == Introduction == === Scope === A slew performs the transition between two attitude laws. === Javadoc === The attitude objects linked to slews are available i... »

Nouvelle page

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

=== Javadoc ===
The attitude objects linked to slews are available in the package fr.cnes.sirius.patrius.attitudes.

{| class="wikitable"
|-
! scope="col"| Library
! scope="col"| Javadoc
|-
|Patrius
|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/package-summary.html Package fr.cnes.sirius.patrius.attitudes]
|}

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

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

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

[[File:slew.jpg|center]]

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>

=== ISIS Spin bias slew ===
This spin bias slew is a slew with a trapezoidal angular velocity profile:
- Constant acceleration phase
- Constant angular velocity phase (zero acceleration phase)
- Constant decceleration phase

[[File:ISISSpin2.png|center]]

This slew can be computed using classes: 
- <code>IsisAnalyticalSpinBiasSlew</code>: this class provides an analytical solution to the slew 
- <code>IsisNumericalSpinBiasSlew</code>: this class provides an numerical solution to the slew
The two classes returns close results ( < 1E-2 rad), though analytical solution is more accurate.

The slews can be used in two ways: 
- Provide an initial law, an initial date and a target final law: the user must use the enum <code>TypeOfDate.INITIAL</code> at construction. 
- Provide an final law, a final date and a target initial law: the user must use the enum <code>TypeOfDate.FINAL</code> at construction. 
'''Warning''': slew computed in both ways will never be exactly the same depending on user-chosen convergence threshold and maximum number of iterations (result will be exactly the same if convergence threshold is lower than machine precision and number of allowed iterations high enough to support convergence).

The slew has then to be calculated using method <code>compute()</code>.
Finally the slew can be used like any other slew.

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

== Contents ==
=== Interfaces ===

{| class="wikitable"
|-
! scope="col"| Interface
! scope="col"| Summary
! scope="col"| Javadoc
|-
|'''AttitudeLeg'''
|This interface extends the AttitudeProvider interface and adds the time interval of validity notion to the attitude laws.
|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/AttitudeLeg.html AttitudeLeg]
|-
|'''Slew'''
|This interface implements a generic slew model set.
|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/Slew.html Slew]
|}

=== Classes ===

{| class="wikitable"
|-
! scope="col"| Class
! scope="col"| Summary
! scope="col"| Javadoc
|-
|'''AbstractSlew'''
|This abstract class implements slew maneuvers.
|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/AbstractSlew.html AbstractSlew]
|-
|'''ConstantSpinSlew'''
|This class implements the constant spin slew maneuver profile.
|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/ConstantSpinSlew.html ConstantSpinSlew]
|-
|'''TwoSpinBiasSlew'''
|This class implements the spin bias slew profile with two available spin profiles.
|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/TwoSpinBiasSlew.html TwoSpinBiasSlew]
|-
|'''IsisAnalyticalSpinBiasSlew'''
|This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Analytical solution).
|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/IsisAnalyticalSpinBiasSlew.html IsisAnalyticalSpinBiasSlew]
|-
|'''IsisNumericalSpinBiasSlew'''
|This class implements the ISIS spin bias slew profile (constant acceleration/decceleration phases - Numerical solution).
|[{{JavaDoc4.5}}/fr/cnes/sirius/patrius/attitudes/IsisNumericalSpinBiasSlew.html IsisNumericalSpinBiasSlew]
|}

[[Category:User_Manual_4.5_Attitude]]

User Manual 4.5 Slew - Historique des versions

Admin : /* Constant spin slew */

Admin : /* Constant spin slew */

Admin : /* ISIS Spin bias slew */

Admin : /* Spin bias slew */

Admin : /* Package Overview */

Admin : /* Package Overview */

Admin : /* Classes */

Admin : Page créée avec « __NOTOC__ == Introduction == === Scope === A slew performs the transition between two attitude laws. === Javadoc === The attitude objects linked to slews are available i... »

Admin : /* Constant spin slew */

Admin : /* Constant spin slew */

Admin : /* ISIS Spin bias slew */

Admin : /* Spin bias slew */

Admin : /* Package Overview */

Admin : /* Package Overview */

Admin : /* Classes */

Admin : Page créée avec « NOTOC == Introduction == === Scope === A slew performs the transition between two attitude laws. === Javadoc === The attitude objects linked to slews are available i... »