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Bainan Yang

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Proceedings Article | 10 February 2023 Paper

A single-axis rotation modulation strapdown gravity vector measurement method considering scale factor

Caixia Ma, Bainan Yang, Tianyi Xie, Juliang Cao, Guo Yan, Shaokun Cai

Proceedings Volume 12552, 125521P (2023) https://doi.org/10.1117/12.2667266

KEYWORDS: Modulation, Error analysis, Gyroscopes, Accelerometers, Defense technologies, Navigation systems

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Aiming at the problem that the single-axis rotation modulation technology is currently used in gravity measurement, only considering the inertial device's zero bias will restrict gravity measurement accuracy, a single-axis rotation modulation strapdown gravity vector measurement method considering the scale factor error is proposed. This method analyzes the one-way continuous rotation scheme and finds that the up-direction scale factor error stimulates additional attitude errors. To suppress the error and improve the measurement accuracy of the strapdown gravity vector, a dual-position forward and reverse turn-and-stop scheme is adopted, which designs a reasonable rotation path, stop position, and time. The simulation results show that the dual-position forward and reverse turn-and-stop scheme, considering the scale factor, can effectively improve the accuracy of gravity measurement compared with the one-way continuous rotation scheme. This study has great technical reference significance and engineering practice significance and can meet the needs of high-precision airborne and marine gravity measurement.

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