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Foundation ::
Trajectories and Orbital Mechanics ::
ODEAS
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ODEAS
Orbit Determination Error Analysis System
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Moderators:
Adopt This Application!
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SOURCE CODE AVAILABLE
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ODEAS is a general-purpose linear error analysis program that can be used in all phases of mission support, including pre-mission error analysis for various orbit determination scenarios. On the basis of a tracking schedule and the expected accuracies of the orbital dynamics and measurement process, ODEAS provides the magnitude and characteristics of the errors that can be expected in an orbit estimation process. ODEAS evaluates the accuracy of an orbit determination process either in a sequential or a batch processing mode. A Kalman filter and an optimal smoother are supported in sequential processing, and a weighted least-squares method is supported in batch processing. The tracking systems modeled by ODEAS include the Ground Spaceflight Tracking and Data Network (GSTDN), Tracking and Data Relay Satellite System (TDRSS), Bilateration Ranging Transponder System (BRTS), Global Positioning System (GPS), and Advanced Tracking and Data Relay Satellite System (TDRSS II).
Input setup for an ODEAS execution includes the specification of an epoch time, the spacecraft elements at the specified epoch time, the ground station acronym(s) or the station geodetics, the error analysis processing method, error parameters to be included in the analysis, error analysis results output frequency and output options, and the tracking schedule setup to generate visible tracking passes. ODEAS output includes initial conditions, error analysis, and processed measurements reports and error budget summary and plots. In addition to standard input and output, optional input and output is available.
ODEAS carries the NASA case number GSC-13919. It was originally released as part of the COSMIC collection.
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