Abstract
A real-time predictive e lter is derived for spacecraft attitude estimation without the utilization of angular rate measurements from gyros. The formulation is shown using only attitude sensors (three-axis magnetometers, sun sensors,startrackers, etc. ).Thenew real-timenonlineare lter predicts the requiredtorquemodeling errorinput in ordertopropagatethespacecraftdynamicmodel,sothatmodelresponsesmatchthemeasuredvectorobservations. The real-time predictive e lter is used to estimate the attitude of the Solar, Anomalous, Magnetospheric Particle Explorer (SAMPEX) spacecraft. Results using this new algorithm indicate that the real-time predictive e lter accurately estimates the attitude of an actual spacecraft with the sole use of magnetometer sensor measurements.
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