| 群时延的新概念、测量方法及其应用 |
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| 引用本文： | 朱祥维,李垣陵,雍少为,庄钊文.群时延的新概念、测量方法及其应用[J].电子学报,2008,36(9):1819-1823. |
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| 作者姓名： | 朱祥维 李垣陵 雍少为 庄钊文 |
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| 作者单位： | 国防科技大学电子科学与工程学院卫星导航研发中心,湖南长沙,410073 |
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| 基金项目： | 教育部跨世纪优秀人才培养计划 |
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| 摘 要： | 群时延是衡量传输网络对信号传输时间延迟及信号失真影响的重要参数.基于微分(差分)的传统群时定义和测量存在如下缺点:存在分辨率与精度之间的矛盾,不能反映一定带宽内的整体相位特性,难以定量描述相位的非线性畸变.为了解决这些问题,本文从相频特性整体出发,基于Taylor展开给出了一种新的群时延的定义和测量方法.在GPS授时接收机电缆传输特性测试中的实验结果表明,新测量方法测得的群时延达到了0.01ns的测量精度,与GPS授时接收机测得的信号传输时延之间最大偏差不超过0.3ns,具有良好的对应关系.
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| 关 键 词： | 群时延 时间同步 伪距 GPS授时接收机 Taylor级数 |
| 收稿时间： | 2007-05-31 |
A New Definition,Measurement Method of Group Delay and Its Application |
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| ZHU Xiang-wei,LI Yuan-ling,YONG Sha-wei,ZHUANG Zho-wen.A New Definition,Measurement Method of Group Delay and Its Application[J].Acta Electronica Sinica,2008,36(9):1819-1823. |
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| Authors: | ZHU Xiang-wei LI Yuan-ling YONG Sha-wei ZHUANG Zho-wen |
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| Affiliation: | ZHU Xiang-wei,LI Yuan-ling,YONG Shao-wei,ZHUANG Zhao-wen(Satellite Navigation R&D Center,School of Electronic Science , Engineering,National University of Defense Technology,Changsha,Hunan 410073,China) |
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| Abstract: | Group delay is an important parameter describing network transfer delay and distortion characteristics.Traditional definition and measurement formula of group delay is based on derivative,which has some inherent faults: the inconsistency of resolution and accuracy,incapacity to describe the global phase character of signal bandwidth and difficulty to describe phase distortion quantificationally.To resolve these problems,a new group delay definition and measurement formula has been put forward based on Taylo... |
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| Keywords: | group delay time synchronization pseudo-rang GPS time transfer receiver Taylor series expansion |
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