Description
The EstimableAcceleration object holds information about how acceleration bias elements of an object's state are handled in the Orbit Determination / State Estimation process. This object is not creatable in script, but estimable accelerations are always created as child objects of the SpacecraftODProperties object as seen in the example below:
Spacecraft1.OD.OtherAccelerationsX.Sigma = 1e-006;
Users cannot create instances of this type of object. However, users can access instances of this object type that have been created indirectly, for example as children of other objects. Users can also access any static properties and methods on this object type.
Inheritance Hierarchy: Object->EstimableProperty->EstimableAcceleration
Parent Object: SpacecraftODProperties
Available In Editions:
Engineer
Mission
Timing Precision Mode
This page describes functionality in nanosecond timing precision mode.
Click here to see the documentation for this object in millisecond timing precision mode.
Name
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Description
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Attributes
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DeclaredName
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The name of the object as declared.
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Type: String
Access: Read-Only
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DisplayName
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The name displayed for this object in output windows such as views, plots, and reports.
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Type: String
Access: Read/Write
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ObjectId
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The unique identifier for the object.
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Type: Variable
Access: Read-Only
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ObjectType
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The type of the object.
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Type: String
Access: Read-Only
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ProcessAction
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Indicates whether the property should be estimated, considered, or ignored in the Orbit Determination process. If this property is part of a Spacecraft, which also has a process noise matrix interface, then changing this value will reinitialize the process noise matrix to a diagonal matrix in the ICRF frame.
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Type: Variable
Access: Read/Write
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ProcessNoiseRate
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The amount of process noise per second to be added to the property's covariance with each time-step. If the property is frame dependent, setting this property will set it in the ICRF frame. If the property is part of a Spacecraft, which also has a process noise matrix interface, then setting this value will reinitialize the process noise matrix to a diagonal matrix in the ICRF frame. Alternatively, you can modify the process noise rate for this property by modifying the Spacecraft.OD.ProcessNoise.Matrix property directly, which will leave all other values intact.
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Type: Variable
Access: Read/Write
Units: km^2/s^5
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Sigma
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Specifies the uncertainty (standard deviation) in the value of the property.
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Type: Variable
Access: Read/Write
Units: km/s^2
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SmoothedValue
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The smoothed value of the property when the property is estimated in Kalman Filter / Smoother combination.
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Type: Variable
Access: Read-Only
Units: km/s^2
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StateUpdate
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The value of the state update that is applied to this property when it is estimated in an Orbit Determination process.
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Type: Variable
Access: Read-Only
Units: km/s^2
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Value
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The current value of the property.
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Type: Variable
Access: Read/Write
Units: km/s^2
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Name
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Description
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ClearSavedStates
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Clears previous saved states for this object.
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GetFromFile
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Load the object state from the specified FreeFlyer object file.
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GetFromString
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Load the object state from the specified string.
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PutToFile
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Convert the object state to FreeFlyer object xml and write to a file.
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PutToString
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Convert the object state to FreeFlyer object xml and return as a string.
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ReferenceEquals
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Returns 1 if the argument refers to the calling object and 0 otherwise.
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Restore
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Restore an object's state from a previously saved state.
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Save
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Save the object's state so that it can be restored later.
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Name
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Description
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Attributes
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ProcessNoise
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The process noise to be added to the property's covariance with each time-step. The amount of process noise added is scaled by a ratio of the duration of the step taken and the propagator step size.
This property has been deprecated as of FreeFlyer version 7.9. ProcessNoise has been replaced by ProcessNoiseRate. To continue using this property, please ensure to set the ProcessNoiseModel property to 'Use ProcessNoise By Step'. The ProcessNoiseModel property can be found on any Sequential Filter object or the Spacecraft OD Properties object.
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Type: Variable
Access: Read/Write
Units: km^2/s^4
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See also
Orbit Determination Guide
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