The estimation of subsample time delay of arrival in the discrete-time measurement of phase delay
The estimation of subsample time delay of arrival in the discrete-time measurement of phase delay
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DOI：
10.1109/19.816141
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发表时间：
1999-12-01
影响因子：
5.6
通讯作者：
Woods, GS
中科院分区：
文献类型：
--
作者：
Maskell, DL;Woods, GS
基于互相关函数的极值或两个信号的一些其它统计的识别的时间延迟估计（TDE）技术通常使用点之间的某种形式的内插来获得比采样周期更精细的分辨率。由于插值函数和实际离散时间相关函数之间的不匹配，这些技术通常会引入一些偏差。我们提出了一个离散的时间TDE适合测量两个周期性信号之间的延迟与采样周期的一小部分的分辨率。该技术是基于一个单独的参考，外部的两个测量的信号，这是允许的延迟的子样本增量而变化。仿真结果表明，增量参考法在高信噪比和低信噪比下均无明显的测量偏差，上级抛物线插值法，适用于群时延和距离的测量。
Time delay estimation (TDE) techniques based upon the identification of the extremum of the cross-correlation function, or some other statistic of two signals, typically use some form of interpolation between points to obtain a resolution finer than the sample period. Often these techniques introduce some bias because of mismatch between the interpolating function and the actual discrete-time correlation function. We present a discrete; time TDE suitable for measuring the delay between two periodic signals with a resolution of a fraction of the sampling period. The technique is based upon a separate reference, external to the two measured signals, which is allowed to vary with subsample increments of delay. Simulations show that the incremental reference technique does not exhibit any significant bias and is superior to parabolic interpolation at both high and low SNR, The technique is suited to the measurement of group-delay or range of an object.