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Tracking and Data Relay Satellite (TDRS) Orbit Estimation Using an Extended Kalman FilterAlternatives to the Tracking and Data Relay Satellite (TDRS) orbit estimation procedure were studied to develop a technique that both produces more reliable results and is more amenable to automation than the prior procedure. The Earth Observing System (EOS) Terra mission has TDRS ephemeris prediction 3(sigma) requirements of 75 meters in position and 5.5 millimeters per second in velocity over a 1.5-day prediction span. Meeting these requirements sometimes required reruns of the prior orbit determination (OD) process, with manual editing of tracking data to get an acceptable solution. After a study of the available alternatives, the Flight Dynamics Facility (FDF) began using the Real-Time Orbit Determination (RTOD(Registered TradeMark)) Kalman filter program for operational support of TDRSs in February 2007. This extended Kalman filter (EKF) is used for daily support, including within hours after most thrusting, to estimate the spacecraft position, velocity, and solar radiation coefficient of reflectivity (C(sub R)). The tracking data used are from the Bilateration Ranging Transponder System (BRTS), selected TDRS System (TDRSS) User satellite tracking data, and Telemetry, Tracking, and Command (TT&C) data. Degraded filter results right after maneuvers and some momentum unloads provided incentive for a hybrid OD technique. The results of combining EKF strengths with the Goddard Trajectory Determination System (GTDS) Differential Correction (DC) program batch-least-squares solutions, as recommended in a 2005 paper on the chain-bias technique, are also presented.
Document ID
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Ward, Douglas T.
(AI Solutions, Inc. Lanham, MD, United States)
Dang, Ket D.
(AI Solutions, Inc. Lanham, MD, United States)
Slojkowski, Steve
(AI Solutions, Inc. Lanham, MD, United States)
Blizzard, Mike
(Honeywell Technology Solutions, Inc. Columbia, MD, United States)
Jenkins, Greg
(Honeywell Technology Solutions, Inc. Columbia, MD, United States)
Date Acquired
August 24, 2013
Publication Date
September 24, 2007
Publication Information
Publication: Proceedings of the 20th International Symposium on Space Flight Dynamics
Subject Category
Spacecraft Design, Testing And Performance
Distribution Limits
Public Use Permitted.
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