| 滤波器群时延特性分析及在信号处理中的应用 |
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| 引用本文： | 石春雷,舒金龙,朱振福,车国锋.滤波器群时延特性分析及在信号处理中的应用[J].系统工程与电子技术,2003,25(3):260-262. |
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| 作者姓名： | 石春雷 舒金龙 朱振福 车国锋 |
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| 作者单位： | 1. 国防科技大学电子科学与工程学院,湖南,长沙,410073
2. 中国航天科工集团第二研究院207所,北京,100854 |
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| 摘 要： | 群时延是衡量系统对信号处理时间延迟的理论,对滤波器来说,不同频率的信号具有不同的延迟值。结合信号处理研究了群时延理论及其物理意义。对不同类型滤波器进行了分析论述,得出了线性滤波器群时延特性不随信号变化而变化,但在某些频率上会产生时延峰值的结论,并对几种信号作了分析。实验证明,将这一结论推广运用于空域中,对已知频率的信号,设计特定频率延迟的滤波器应用于图像目标检测,效果良好。
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| 关 键 词： | 群时延 相频 信号检测 |
| 文章编号： | 1001-506X(2003)03-0260-03 |
| 修稿时间： | 2002年6月1日 |
Analysis of Filter GD Property and Its Application in Signal Processing |
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| SHI Chun-lei,SHU Jin-long,ZHU Zhen-fu,CHE Guo-feng.Analysis of Filter GD Property and Its Application in Signal Processing[J].System Engineering and Electronics,2003,25(3):260-262. |
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| Authors: | SHI Chun-lei SHU Jin-long ZHU Zhen-fu CHE Guo-feng |
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| Institution: | SHI Chun-lei1,SHU Jin-long1,ZHU Zhen-fu2,CHE Guo-feng1 |
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| Abstract: | The GD (group delay) is a weighing rule to the signal processing time delay of system,and as for the filter,the signal of different frequencies possesses different delay values. This paper studies GD theory and its physical meaning in terms of signal processing. The filter to the different linearity is analyzed and discussed,the correlation theory which can be used in the signal detection is reached, and Several kinds of signals are analyzed. This theory has been used in the spatial area. With the signal frequency known,the filter with a given frequency delay is designed for an image target detection. The experiment proves that the filtering effect is good. |
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| Keywords: | Group delay Phase frequency Signal detection |
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