四个参数正弦与不到一个周期的数据拟合

Proceedings of the 20th IEEE Instrumentation Technology Conference (Cat. No.03CH37412) Pub Date : 2003-05-20 DOI:10.1109/IMTC.2003.1208132

S. Max

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引用次数: 8

摘要

-当ADC获取的是正弦波数据，且记录长度小于一个周期的正弦波，且正弦波的频率或采样频率不准确时，标准的四参数曲线fir算法并不总是收敛。该算法在数据集包含一个周期的正弦波的20%到100%时提取四个参数。测试了对噪声和谐波变形的灵敏度，结果收敛到接近正确值，但存在噪声和谐波变形的灵敏度。

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Four parameter sine fit with less than one cycle of data

- When an ADC acquires sine-wave dafa and the record length confains less fhan one cycle of fhe sine wave, and fhe frequency of fhe sine-wave or the sampling frequency are not known exacfly, the standard four parameter curve-fir algorithm does nof always converge. A technique, usingpolynomial~fting, is demonstrafed The algorithm extracfs the four paramefers when the dafa sef includes from 20% fo 100% of a cycle of fhe sine wave. The sensitivify to noise and harmonic disforfion is examined The resulfs converge fo near the correcf values, but fhere are noise and harmonic disforfion sensifivifies.

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Proceedings of the 20th IEEE Instrumentation Technology Conference (Cat. No.03CH37412)

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