A phase spectrum time delay estimation method based on frequency difference compensation
A phase spectrum time delay estimation method based on frequency difference compensation
复制标题
一种基于频差补偿的相位谱时延估计方法
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Gao, Yang1
中科院分区：
文献类型：
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作者：
You, Guo-Hong1;Sha, Lan1;Zhao, Xiao-Ping1;Gao, Yang1
分析了影响窄带射频信号时延估计精度的三个主要因素：中频差、信号带宽和信噪比。提出了一种基于频差补偿的相位谱时延估计方法。采用倍频法分别对接收信号的中频进行估计，并利用频差补偿方法消除中频差对时延估计结果的影响。在有限的带宽内，采用线性调频Z变换(CZT)来增加可用的频段。同时，利用线性调频Z变换(CZT)对接收信号进行时延估计由于卡尔曼滤波具有良好的抗噪特性，提高了时差分析的精度。理论分析和计算机仿真结果表明了该方法的有效性和优越性。
Three main factors which affect the accuracy of time delay estimation(TDE) for narrowband radio frequency(RF) signals are mentioned: intermediate frequency difference,signal bandwidth and SNR.A phase spectrum TDE method based on frequency difference compensation(FDC) is proposed.The intermediate frequencies(IF) of both received signals are estimated respectively using frequency doubling method,and FDC method is used to eliminate the side effect of IF difference to TDE result.Then,chirp Z transform(CZT) is applied to increasing the available frequency bins within a limited bandwidth.Meanwhile,Kalman filter is also adopted because of its excellent anti-noise characteristics to improve precision of TDE.Both theoretical analyses and computer simulation results show the effectiveness and advantage of the proposed method.