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An Attitude Filtering and Magnetometer Calibration Approach for Nanosatellites

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Abstract

We propose an attitude filtering and magnetometer calibration approach for nanosatellites. Measurements from magnetometers, Sun sensor and gyros are used in the filtering algorithm to estimate the attitude of the satellite together with the bias terms for the gyros and magnetometers. In the traditional approach for the attitude filtering, the attitude sensor measurements are used in the filter with a nonlinear vector measurement model. In the proposed algorithm, the TRIAD algorithm is used in conjunction with the unscented Kalman filter (UKF) to form the nontraditional attitude filter. First the vector measurements from the magnetometer and Sun sensor are processed with the TRIAD algorithm to obtain a coarse attitude estimate for the spacecraft. In the second phase the estimated coarse attitude is used as quaternion measurements for the UKF. The UKF estimates the fine attitude, and the gyro and magnetometer biases. We evaluate the algorithm for a hypothetical nanosatellite by numerical simulations. The results show that the attitude of the satellite can be estimated with an accuracy better than 0.5\({^{\circ }}\) and the computational load decreases more than 25% compared to a traditional UKF algorithm. We discuss the algorithm’s performance in case of a time-variance in the magnetometer errors.

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Acknowledgements

This research is supported by JSPS KAKENHI Grant number 16K18313.

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Authors and Affiliations

  1. Japan Aerospace Exploration Agency (JAXA), Institute of Space and Astronautical Science (ISAS), Sagamihara, 252-5210, Japan

    Halil Ersin Söken

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Correspondence to Halil Ersin Söken.

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An earlier version of this paper was presented at APISAT 2017, Seoul, Korea, October 2017.

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Söken, H.E. An Attitude Filtering and Magnetometer Calibration Approach for Nanosatellites. JASS 19, 164–171 (2018). https://doi.org/10.1007/s42405-018-0020-8

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