This 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.
PC-Based Magnetometer-Only Attitude and Rate Determination System for Gyroless Spacecraft
1995
14 pages
Report
No indication
English
Astronautics , Spacecraft Trajectories & Flight Mechanics , Algorithms , Attitude (Inclination) , Computer programs , Field intensity meters , In-flight monitoring , Kalman filters , Magnetic fields , Magnetometers , Orbital position estimation , Spacecraft orbits , State estimation , Determinants , Earth radiation budget experiment , Explorer satellites , In situ measurement , Line of sight , Magnetic measurement , Mathematical models , Real time operation
A PC-Based Magnetometer-Only Attitude and Rate Determination System for Gyroless Spacecraft
British Library Conference Proceedings | 1995
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