Setting up an OD System

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FreeFlyer contains several different objects that have at least one property that can be estimated. For information on the configuration of these objects, see:

 

•Spacecraft OD Setup

oGNSSReceiver Setup

oSensor Setup

oTransponder Setup

oTDRSTransponder Setup

•GroundStation OD Setup

oGroundAntenna Setup

•Thrust Event OD Setup

oImpulsiveBurn Setup

oFiniteBurn Setup

oOutgassingEvent Setup

 

The estimator forms the core of any OD process. It contains references to the objects to be estimated (as listed above) as well as references to all tracking data to be processed. FreeFlyer supports four kinds of estimators: Extended Kalman Filter, Square Root Information Filter, Unscented Kalman Filter, and Batch Least Squares. For more information, see:

 

•Estimation Techniques

oSetting up a Batch Least Squares Estimator

oSetting up an Extended Kalman Filter

oSetting up a Square Root Information Filter

oSetting up an Unscented Kalman Filter

oSetting up a Smoother

 

After choosing your estimation technique, there are a few other areas that require some configuration. Additional items that you may need to set up include:

 

•Defining A Priori States

•Defining Measurement Model

•Defining Thrust Events

•Defining Properties to Estimate

•Including Tracking Data in an Estimation Process

 

Once you have completed the initial setup of your OD system, continue to the Tracking Data and Performing State Estimation sections for information on how to use your configuration to generate results.