无窗全相位FFT/FFT相位差频移补偿频率估计器

黄翔东; 王越冬; 靳旭康; 吕卫

doi:10.11999/JEIT151041

无窗全相位FFT/FFT相位差频移补偿频率估计器

doi: 10.11999/JEIT151041

基金项目:

国家自然科学基金(61271322)

计量
- 文章访问数: 1655
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- 被引次数: 0
出版历程
- 收稿日期: 2015-09-14
- 修回日期: 2016-03-08
- 刊出日期: 2016-05-19

No-windowed apFFT/FFT Phase Difference Frequency Estimator Based on Frequency-shift Compensation

Funds:

Foundation Item: The National Natural Science Foundation of China (61271322)

摘要

摘要: 为提高经典全相位FFT/FFT相位差频率估计器的精度，该文提出无窗模式和频移补偿两项改进措施。借助谱分析试验和理论分析，该文证明无窗模式相比于原有加窗模式更能增强全相位FFT和FFT的峰值谱幅度，从而增强抵御噪声的能力；借助频移补偿措施，使得无窗模式下的apFFT和FFT总能工作在小频偏状态，从而有助于提取准确的相位差信息。仿真实验表明，该文的改进估计器，对于单频测量情况，其频率估计方差紧靠克拉美-罗限，对于多频情况，相比于现有的Tsui内插估计器，在低信噪比环境下表现出更好的抗干扰性能，因而具有较广泛的应用前景。
- 频率估计 /
- 克拉美-罗下限 /
- 频移补偿 /
- 全相位FFT /
- 无窗模式
Abstract: In order to enhance the accuracy of the classical all-phase FFT/FFT phase-difference frequency estimator, two improvement measures are proposed: no-windowed mode and frequency-shift compensation. By means of spectral analysis trials and theoretical analysis, it is proved that the no-windowed mode outperforms the windowing mode in highlighting the peak spectral bins of apFFT and FFT, thereby enhancing the estimators robustness to noise contamination. By means of frequency-shift compensation, the no-windowed apFFT and FFT can always work in the state of small frequency deviation, which helps to extract accurate information of phase difference. Simulation results show that, for the proposed estimator, its frequency estimate variance approximates the Cramer-Rao lower bound. Moreover, compared to the Tsui interpolation-based estimator, it also exhibits higher performance of anti-interference in low SNR circumstances, which presents the vast potential for future development.
- Frequency estimate /
- Cramer-Rao lower bound /
- Frequency-shift compensation /
- All-phase FFT /
- No-windowed mode

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参考文献(29)

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