Star Centroid Positioning Error Correction Aided by Gyroscope Output in INS and CNS
Publication: Journal of Aerospace Engineering
Volume 33, Issue 5
Abstract
In a traditional integrated inertial navigation system (INS) and celestial navigation system (CNS) setup, measurements from both systems are only fused at the data output phase. Navigation star centroid positioning error persists in the calculated celestial measurement, which inevitably affects the entire integrated navigation system’s accuracy. This paper proposes a novel integrated INS and CNS navigation system that includes two filtering processes. The angular velocity derived from the star centroid positioning information provides measurements in the first filter. To correct the star centroid positioning error, the gyroscope’s real-time output is used to fuse this measurement via the nonlinear least-square method. In the second filter, the CNS attitude measurement is calculated from the corrected star centroid positioning information. Then, the INS and CNS measurements are combined via a standard Kalman filter to estimate the spacecraft attitude. Comparing the INS/CNS integrated system with the traditional star centroid positioning method, the simulation results illustrate that the proposed method markedly reduces star centroid positioning error and has strong universal applicability to provide similar high-accuracy spacecraft attitude estimations regardless of star sensor specifications.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available in a repository online in accordance with funder data retention policies (SAO Staff 2001).
Acknowledgments
This work was supported by the National Natural Science Foundation of China under Grant Nos. 61603364 and 91438107, the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University, China, under Grant No. CX201956, and the Stable Supporting Fund of National Key Laboratory on Blind Signal Processing under Grant No. 61424131903. Thanks are also offered for the support of the China Scholarship Council, China (201706290126).
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Information
Published In
Journal of Aerospace Engineering
Volume 33 • Issue 5 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Aug 26, 2019
Accepted: Feb 18, 2020
Published online: Jun 30, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 30, 2020
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