**6. Conclusions**

This paper presents a powerful denoising method based on SVD and the improved AIC. Simulation analysis and an engineering application are undertaken to demonstrate the effectiveness of the proposed AIC–SVD, and the following conclusions can be drawn:


By extracting the harmonic parameters, a reasonable disturbance model of reaction wheels will be established to describe the characteristics of micro-vibration. This will be of far-reaching significance in the study of orbital-operation monitoring and vibration-reduction space satellites. In addition, there is still room for improvement in the running efficiency of AIC–SVD, which would be optimized in the following study.

**Author Contributions:** Development of theoretical approach, X.Y. and Y.X.; numerical analysis, X.Y., X.S. and Y.S.; writing—original draft preparation, X.Y.; writing—review and editing, Y.X.

**Funding:** This research was funded by the National Natural Science Foundation of China (U1831123), and the Fundamental Research Funds for the Central Universities (2232017A3-04).

**Acknowledgments:** The authors want to acknowledge supports given by Shanghai Engineering Center for Microsatellites in experiments.

**Conflicts of Interest:** The authors declare no conflict of interest.
