Publication:
NPSAT1 Parameter Estimation Using Unscented Kalman Filtering

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Authors
Sekhavat, Pooya
Ross, I. Michael
Gong, Qi
Subjects
Kalman Filtering
satellite
three-axismagnetometer
sensor
Advisors
Date of Issue
2007-07-11
Date
July 11-13, 2007
Publisher
IEEE
Language
Abstract
NPSAT1 is a small satellite being built at the Naval Postgraduate School and scheduled to launch in 2007. It primarily employs magnetic sensing and actuation for attitude control. The nature of the in-house fabrication and assembly of the spacecraft requires reliable computational estimation of the difficult-to-measure parameters of the end-product. The inherent nonlinear dynamics of the system makes the observer design a challenging problem. This paper presents the successful implementation of the Unscented Kalman Filter (UKF) for the spacecraft parameter estimation. Since a three-axis magnetometer is the only sensor onboard, the UKF algorithm also estimates the system orientation and angular velocity. The unit quaternion constraint is enforced by treating the norm of the quaternion's as a dummy measurement. Simulations and ground test experimental results show the superior performance of the UKF in spacecraft dual state-parameter estimation.
Type
Conference Paper
Description
The article of record as published may be located at http://ieeexplore.ieee.org
Proceedings of the 2007 American Control Conference Marriott Marquis Hotel at Times Square New York City, USA, July 11-13, 2007
Series/Report No
Department
Mechanical & Astronautical Engineering
Identifiers
NPS Report Number
Sponsors
Funder
NA
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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