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Attitude and Trajectory Determination using Magnetometers and Estimated RatesA simultaneous attitude and orbit determination algorithm which uses magnetometer measurements and estimated attitude rates is presented. This is an extension of an algorithm which uses magnetometer and rate gyro measurements. The new algorithm is intended for gyroless spacecraft, or in the case of gyro failures/saturation. Torque control input data is used in forming the rate estimates. Simulation tests of the algorithm are presented. First, tests were performed using the 'true' rate values at each time step. This simulated using accurate gyro measurements. Then, tests were performed estimating the rates. Using estimated rates rather than 'gyro measurements' did not significantly degrade the algorithm's performance if accurate estimates of the initial rates were available. An initial Root-Sum-Square (RSS) position error of 1,400 km was reduced to an average error of approximately 100 km within the first two minutes. The RSS attitude error converged to less than 1.5 degrees within three orbits.
Document ID
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Schierman, J. D.
(Maryland Univ. College Park, MD United States)
Schmidt, D. K.
(Maryland Univ. College Park, MD United States)
Deutschmann, J.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
September 8, 2013
Publication Date
May 1, 1997
Publication Information
Publication: Flight Mechanics Symposium 1997
Subject Category
Accession Number
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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