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A PC-based magnetometer-only attitude and rate determination system for gyroless spacecraftThis paper describes a prototype PC-based system that uses measurements from a three-axis magnetometer (TAM) to estimate the state (three-axis attitude and rates) of a spacecraft given no a priori information other than the mass properties. The system uses two algorithms that estimate the spacecraft's state - a deterministic magnetic-field only algorithm and a Kalman filter for gyroless spacecraft. The algorithms are combined by invoking the deterministic algorithm to generate the spacecraft state at epoch using a small batch of data and then using this deterministic epoch solution as the initial condition for the Kalman filter during the production run. System input comprises processed data that includes TAM and reference magnetic field data. Additional information, such as control system data and measurements from line-of-sight sensors, can be input to the system if available. Test results are presented using in-flight data from two three-axis stabilized spacecraft: Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX) (gyroless, Sun-pointing) and Earth Radiation Budget Satellite (ERBS) (gyro-based, Earth-pointing). The results show that, using as little as 700 s of data, the system is capable of accuracies of 1.5 deg in attitude and 0.01 deg/s in rates; i.e., within SAMPEX mission requirements.
Document ID
19950021349
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Challa, M.
(Computer Sciences Corp. Lanham, MD., United States)
Natanson, G.
(Computer Sciences Corp. Lanham, MD., United States)
Deutschmann, J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Galal, K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1995
Publication Information
Publication: Flight Mechanics(Estimation Theory Symposium 1995
Subject Category
Astrodynamics
Accession Number
95N27770
Funding Number(s)
CONTRACT_GRANT: NAS5-31500
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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