Description

Real time attitude interface.

Object Model

Public Methods

AddCBFQuaternion	Adds attitude data based on a time-ordered set of quaternions interpreted relative to CBF.
AddECIYPR	Adds attitude data based on a time-ordered set of yaw, pitch, roll angles in the J2000 ECI coordinate system.
AddEuler	Adds attitude data based on a time-ordered set of Euler angles.
AddQuaternion	Adds attitude data based on a time-ordered set of quaternions.
AddYPR	Adds attitude data based on a time-ordered set of yaw, pitch and roll angles.
ClearAll	Clear attitude data created using AddXXX commands

Public Properties

BlockFactor	A block factor used to help size allocated memory used to hold the history
DataReference	Returns a reference attitude profile for incoming attitude data.
Duration	Get look ahead/look behind duration.
LookAheadMethod	Look ahead method can be extrapolate or hold.

Interfaces

Implemented Interface
IAgVeAttitude

Example

Add attitude data based on a time-ordered set of quaternions interpreted relative to CBF

[C#] Copy Code

satellite.SetAttitudeType(AgEVeAttitude.eAttitudeRealTime); 


IAgVeAttitudeRealTime realtime = satellite.Attitude as IAgVeAttitudeRealTime; 


 

for (int i = 0; i < cpfQuaternion.GetUpperBound(0); i++) 


{ 

    realtime.AddCBFQuaternion( 

        cpfQuaternion.GetValue(i, 0), 


        (double)cpfQuaternion.GetValue(i, 1), 


        (double)cpfQuaternion.GetValue(i, 2), 


        (double)cpfQuaternion.GetValue(i, 3), 


        (double)cpfQuaternion.GetValue(i, 4)); 


}

Configure real-time attitude

[C#] Copy Code

// set attitude type to real time 


satellite.SetAttitudeType(AgEVeAttitude.eAttitudeRealTime); 


IAgVeAttitudeRealTime realtime = satellite.Attitude as IAgVeAttitudeRealTime; 


 

// Set our Attitude Look Ahead method to Extrapolate 


realtime.LookAheadMethod = AgEVeLookAheadMethod.eExtrapolate; 


 

// Duration 


IAgVeDuration duration = realtime.Duration; 


duration.LookAhead = 1600.0; 

duration.LookBehind = 1600.0; 

 

// BlockFactor 


realtime.BlockFactor = 40; 

realtime.DataReference.SetProfileType(AgEVeProfile.eProfileInertiallyFixed);

Add attitude data based on a time-ordered set of quaternions interpreted relative to CBF

[Visual Basic .NET] Copy Code

satellite.SetAttitudeType(AgEVeAttitude.eAttitudeRealTime)

Dim realtime As IAgVeAttitudeRealTime =
TryCast(satellite.Attitude, IAgVeAttitudeRealTime)



Dim i As
Integer = 0

While i <>

    realtime.AddCBFQuaternion(cpfQuaternion.GetValue(i,
0), DirectCast(cpfQuaternion.GetValue(i, 1), Double), DirectCast(cpfQuaternion.GetValue(i, 2),
Double),
DirectCast(cpfQuaternion.GetValue(i, 3), Double), DirectCast(cpfQuaternion.GetValue(i, 4),
Double))

    System.Math.Max(System.Threading.Interlocked.Increment(i),i
- 1)

End While

Configure real-time attitude

[Visual Basic .NET] Copy Code

' set
attitude type to real time

satellite.SetAttitudeType(AgEVeAttitude.eAttitudeRealTime)

Dim realtime As IAgVeAttitudeRealTime =
TryCast(satellite.Attitude, IAgVeAttitudeRealTime)



' Set our Attitude Look Ahead method to
Extrapolate

realtime.LookAheadMethod = AgEVeLookAheadMethod.eExtrapolate



' Duration

Dim duration As IAgVeDuration = realtime.Duration

duration.LookAhead = 1600

duration.LookBehind = 1600



' BlockFactor

realtime.BlockFactor = 40

realtime.DataReference.SetProfileType(AgEVeProfile.eProfileInertiallyFixed)

CoClasses that Implement IAgVeAttitudeRealTime

Name
AgVeAttitudeRealTime

AGI STK Objects 11	Send comments on this topic.
IAgVeAttitudeRealTime Interface