Multi-frequency Synchronized Measurement Method of Bioimpedance Spectroscopy Based on Nuttall Self-convolution Windowed FFT Algorithm
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摘要: 传统的扫频式生物电阻抗频谱(BIS)测量法难以准确反映生物体真实的阻抗信息，开发BIS的多频率同时快速测量方法具有重要意义。该文提出一种基于多频率同步(MFS)信号激励和加窗改进FFT算法的BIS多频率同步快速测量方法。该文首先介绍了一种7频率同步信号的合成及其频谱特性，提出了性能优良的Nuttall自卷积窗函数，并构建了基于Nuttall自卷积窗的改进插值FFT谐波分析算法，从而在理论上论证了BIS多频率同步快速测量的可行性，为下一步开发实际的BIS快速测量系统提供了技术支持。
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关键词:
- 生物电阻抗谱 /
- 多频率同步信号 /
- Nuttall自卷积窗 /
- 加窗插值FFT算法
Abstract: Since the traditional frequency-sweeping based Bio-Impedance Spectroscopy (BIS) measurement method can not reflect accurately the true impedance of organism, the development of multi-frequency simultaneous fast measurement method of BIS has significance. A BIS Multi-Frequency Synchronized (MFS) measurement method is proposed based on MFS signal excitation and a windowed FFT algorithm. First, the synthesis of a seven-frequency synchronized signal, as well as its spectral characteristic, is introduced. Then, a Nuttall self-convolution window function with excellent performance is put forward, and the improved interpolation FFT-based harmonic analysis algorithm based on this window is built. It validates theoretically the feasibility of the proposed BIS Multi- Frequency Synchronized fast measurement method, and provides technical support for development of practical BIS fast measurement systems. -
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