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| The Improvement and Experiment Analysis for a Four-Parameter Sine Wave Curve-fit Method |
| LIANG Zhi-guo |
| National Key Laboratory of Science and Technology on Metrology & Calibration, Changcheng Institute of Metrology and Measurement, Beijing 100095, China |
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Abstract To introduced a four-parameter sine wave curve-fit method, it based on the frequency estimation method, and then, combining with three-parameter sine wave curve-fit method, to realize the four-parameter sine wave curve-fit course, obtain the four parameters. The method is simple and easy to realize, it needn't pre-estimation of parameters and iteration, it has absolute convergent and high speed calculation course. But in case of lower A/D bites, the arithmetic method is unsteady, it always derives rough results, or wrong results. To these problems, this paper presents some experiments studies, the improvement arithmetic method is introduced, and the limitation of the method is taken out. It can be the base of the sine wave curve-fitting method in application. The correctness and rightness have proved by experiments results. The improved four-parameter sinusoidal curve-fitting method can be used in practice.
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Received: 28 April 2016
Published: 16 June 2017
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Corresponding Authors:
Zhi-Guo LIANG
E-mail: lzg304@sina.com
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2017, Vol. 38 
