SGP4StateEstimator Object

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Description

The SGP4StateEstimator object allows the user to generate a SGP4 state by using a BatchLeastSquaresOD object which computes incremental state updates to converge on a solution.

 

Inheritance Hierarchy: Object->SGP4StateEstimator

 

Available In Editions:

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.

 

Properties

 

Name

Description

Attributes

Batch

The BatchLeastSquaresOD object associated with the the SGP4StateEstimator object. This object controls the iteration process of the fit.

Type:   BatchLeastSquaresOD

Access: Read-Only

DeclaredName

The name of the object as declared.

Type:   String

Access: Read-Only

DisplayName

The name displayed for this object in output windows such as views, plots, and reports.

Type:   String

Access: Read/Write

FitSpanDuration

The length of the fit span as in the ObservationModel object

Type:   TimeSpan

Access: Read/Write

Units:   day

ObjectId

The unique identifier for the object.

Type:   Variable

Access: Read-Only

ObjectType

The type of the object.

Type:   String

Access: Read-Only

ObservationModel

The OrbitStateObservationGenerator object associated with the the SGP4StateEstimator object. This object creates the observations to use in the fit of the trajectory.

Type:   OrbitStateObservationGenerator

Access: Read-Only

ReferenceSpacecraft

The spacecraft whose propagation model defines the trajectory to be fit.

Type:   Spacecraft

Access: Read-Only

SpacecraftBeingFit

The spacecraft whose SGP4 state element set is being computed to optimize the fit.

Type:   Spacecraft

Access: Read-Only

TLEHandler

The TwoLineElement object associated with the the SGP4StateEstimator object. This object facilitates the output of the SGP4 state elements as a TLE.

Type:   TwoLineElement

Access: Read-Only

UseObservationModel

Flag indicating whether to use observations generated from the ObservationModel. This should only be set to false if the Batch child object is to be configured with a set of observations that are not from a reference trajectory.

Type:   Variable

Access: Read/Write

 
 

 

Methods

 

Name

Description

ClearSavedStates

Clears previous saved states for this object.

GetFromFile

Load the object state from the specified FreeFlyer object file.

GetFromString

Load the object state from the specified string.

PerformFit

Executes the fit process, and returns whether convergence occurred.

PutToFile

Convert the object state to FreeFlyer object xml and write to a file.

PutToString

Convert the object state to FreeFlyer object xml and return as a string.

ReferenceEquals

Returns 1 if the argument refers to the calling object and 0 otherwise.

Restore

Restore an object's state from a previously saved state.

Save

Save the object's state so that it can be restored later.

SetReferenceSpacecraft

Set the spacecraft whose propagation model defines the reference trajectory.

SetSpacecraftToProcess

Set the spacecraft to use in the norad state estimation process. This Spacecraft must be associated with a Norad propagator.