| 一种应用三角内插技术的频率估计算法 |
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| 引用本文： | 叶展,张邦宁,郭道省.一种应用三角内插技术的频率估计算法[J].宇航学报,2011,32(1). |
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| 作者姓名： | 叶展 张邦宁 郭道省 |
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| 作者单位： | 解放军理工大学通信工程学院,南京,210007 |
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| 摘 要： | Rife和Quinn等基于FFT的频率估计算法性能不够稳定,在部分频率点能获得满意的估计效果,但在其它频点估计性能恶化严重.本文将三角内插技术应用于频率估计,提出了一种新的基于FFT的频率估计算法,能够克服他们的缺点,非常适合于低信噪比条件下卫星通信信号的接收.该算法首先用FFT实现频率的粗估,再应用三角内插技术提高估计精度,最后对估计偏差进行修正,保证了估计的无偏性.仿真结果表明该算法能实现非常精确的频率估计,且估计性能不受信号频率的影响,在各频点上估计方差都非常接近克拉美劳界(CRB),具有很低的工作门限.与时域估计算法相比,相同估计方差条件下该算法运算量低、易于实现.
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| 关 键 词： | 卫星通信 频率估计 内插 快速傅立叶变换 |
A Trigonometric Interpolation Based Frequency Estimation Algorithm |
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| YE Zhan,ZHANG Bang-ning,GUO Dao-xing.A Trigonometric Interpolation Based Frequency Estimation Algorithm[J].Journal of Astronautics,2011,32(1). |
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| Authors: | YE Zhan ZHANG Bang-ning GUO Dao-xing |
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| Institution: | YE Zhan,ZHANG Bang-ning,GUO Dao-xing(Institute of Telecommunication Eingineering,PLAUST,Nanjing 210007,China) |
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| Abstract: | FFT based frequency estimation algorithms such as Rife and Quinn do not have robust performance in the presence of fluctuation of signal frequency.Good performance can be made at some frequencies.But it is deteriorated seriously at other frequencies.A new frequency estimation algorithm based on trigonometric interpolation is proposed here to solve this problem,and can be applied for satellite communication at low signal-noise ratio.Crude frequency estimation is made by FFT first.Then the trigonometric inter... |
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| Keywords: | Satellite communication Frequency estimation Interpolation FFT |
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