You can configure the Orbit Determination Properties for any FiniteBurn through FreeFlyer script or the Object Browser. There are two ways to navigate to the "General" page under the Orbit Determination section of the FiniteBurn object editor:
1.Open the desired FiniteBurn's editor and navigate to the General page under Orbit Determination 2.Highlight the desired FiniteBurn on the "Thrust Events" page of a Batch Least Squares object editor and select an Associated Spacecraft; then select the burn on the "Objects to Process" page of the Batch Least Squares object and click the "Modify FiniteBurn Estimation Options" button |
From this page, you can configure any of these options:
•The FiniteBurn properties that you want to ignore, estimate, or consider oIgnore: Leave the property out of the estimated state. oEstimate: Include the property in the estimated state and allow the estimator to update its value. oConsider: Include the property in the estimated state, but do NOT allow the estimator to update its value. This means that the property gets included in the covariance, but is not directly estimated. •The A Priori State, Sigma, and Process Noise Rate for each of the properties |
FiniteBurn OD Properties
FiniteBurn events can be modeled using the Batch Least Squares, Kalman Filter, Square Root Information Filter, and Unscented Kalman Filter objects. However, they can only be estimated using Batch Least Squares. To define the FiniteBurn properties that you want to estimate or consider via FreeFlyer script, you will access the FiniteBurn's OD properties, as shown in the example below. See the Defining Thrust Events to Model page for more information.
// Properties to Estimate FiniteBurn1.OD.ThrustOffsetDeltaX.ProcessAction = 1; FiniteBurn1.OD.ThrustOffsetDeltaY.ProcessAction = 1;
// Properties to Ignore FiniteBurn1.OD.ThrustScaleFactor.ProcessAction = 0; |
See Also
•Finite Burns page of the Maneuvering Guide •FiniteBurn Properties and Methods •FiniteBurnODProperties Object Properties and Methods |