TDRSTransponder Setup

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You can configure the Orbit Determination Properties for a TDRSTransponder through FreeFlyer script or the Object Browser. There are two ways to navigate to the "Estimation Properties" page of the TDRSTransponder object editor:


1.Open the desired TDRSTransponder's editor

2.Highlight the desired TDRSTransponder on the "Objects to Process" page of a Kalman Filter, Square Root Information Filter, Unscented Kalman Filter, or Batch Least Squares object editor and click the "Modify TDRSTransponder Estimation Options" button


From this page, you can configure any of these options:


Whether to ignore, estimate, or consider the Transponder Delay

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 Bias, Sigma, and Process Noise for the Delay

The TDRSTransponder send and receive frequencies

The Access Antenna and Frequency band used by this TDRSTransponder

The Translation Frequency, which is the Multi-Access reference frequency for return Doppler tracking; note that this is different than the pilot tone frequency translation on the TDRSObservation and BRTSObservation, as it only pertains to the multi-access service. The GetPilotToneFrequencyTranslation() method returns the pilot tone frequency translation used in computing the TDRS doppler component for the short/2-leg path - this is the value which corresponds to the TranslationFrequency property on the TDRSObservation and BRTSObservation objects.


TDRS Transponder OD Properties

TDRS Transponder OD Properties


To define the TDRS Transponder properties that you want to estimate or consider via FreeForm script, you will access the TDRS Transponder's OD properties, as shown in the example below:


Alias transponder = (Spacecraft1.Transponders[0] AsType TDRSTransponder); // This alias is used to shorten the script examples below


transponder.OD.TransponderDelay.ProcessAction = 1;


Once the TDRS Transponder has been configured, it can be used as a TDRS relay when simulating tracking data or including tracking data in an estimation process.



Attached Sensors

The Attached Sensors page of the TDRS Transponder object editor allows you to indicate any Sensors that will be attached to the TDRS Transponder for simulating or processing OD tracking data. The Sensor's X, Y, and Z position properties will be used to model an offset from the origin of the Spacecraft body coordinate system (BCS) when modeling measurements. You can also specify the Sensors to attach or detach via FreeFlyer script:







See Also

TDRSTransponder Properties and Methods

TransponderODProperties Properties and Methods