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Precise navigation for the Earth Observing System (EOS)-AM1 spacecraft using the TDRSS Onboard Navigation System (TONS)As the baseline navigation system for the Earth Observing System (EOS)-AM1 spacecraft, the Tracking and Data Relay Satellite System (TDRSS) Onboard Navigation System (TONS) is required to provide precise position and velocity information for imaging instrument calibration and routine operations. This paper presents the results of real-time navigation performance evaluations with respect to TONS-based orbit and frequency determination to satisfy this requirement. Both covariance and simulation analysis of EOS-AM1 navigation accuracy and analysis using operational data from Landsat-4 are presented. Local (half orbit) and global (multiple orbits) tracking are considered using a way-forward link services. Improvements in navigation accuracies by using enhanced gravity models beyond the Goddard Earth Model (GEM)-T3 are also discussed. Key objectives of the analysis are to evaluate nominal performance and potential sensitivities and to address algorithm improvements such as TDRS ephemeris biasing, ionosphere model, and gravity process noise models slated for implementation. Results indicate that TONS can be configured to meet the proposed instrument navigation requirements of 20 meters, 3-sigma.
Document ID
19950054125
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Folta, David C.
(NASA Goddard Space Flight Center Greenbelt, MD, US, United States)
Elrod, Bryant
(Stanford Telecommunications, Inc. Reston, VA, US, United States)
Lorenz, Mark
(Stanford Telecommunications, Inc. Reston, VA, US, United States)
Kapoor, Ajay
(Stanford Telecommunications, Inc. Reston, VA, US, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: In: Spaceflight dynamics 1993; AAS(NASA International Symposium, 8th, Greenbelt, MD, Apr. 26-30, 1993, Parts 1 & 2 . A95-85716
Publisher: American Astronautical Society (Advances in the Astronautical Sciences, Vol. 84, Pts. 1 & 2)
ISSN: 0065-3438
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Accession Number
95A85724
Funding Number(s)
CONTRACT_GRANT: NAS5-31500
Distribution Limits
Public
Copyright
Other

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