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| 带通采样定理与中频采集数字正交检波 | |
| 引用本文： | 魏永豪,袁晓,安红. 带通采样定理与中频采集数字正交检波[J]. 现代雷达, 2006, 28(12): 69-71,75 |
| 作者姓名： | 魏永豪 袁晓 安红 |
| 作者单位： | 1. 四川大学电子信息学院,成都,610064 2. 四川大学电子信息学院,成都,610064;电子科技大学电子工程学院,成都,610054 3. 电子对抗国防科技重点实验室,成都,610036 |
| 摘 要： | 结合对带通采样定理的理解，讨论了直接中频带通信号采样正交检波的基本原理，重点探讨正交混频低通滤波法和希尔伯特变换频移法。利用对带通采样定理的理解，扩展其应用范围，给出了适用条件、原理框图以及信号流图。最后用仿真实例验证了扩展方法的可行性，对工程实际有一定的参考意义。 |
| 关 键 词： | 中频采样 正交检波 带通采样定理 低通滤波法 频移法 |
| 收稿时间： | 2006-08-15 |
| 修稿时间： | 2006-08-152006-11-21 |
Bandpass Sampling Theorem and Digital Quadrature Coherent Detection |
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| WEI Yong-hao,YUAN Xiao,AN Hong. Bandpass Sampling Theorem and Digital Quadrature Coherent Detection[J]. Modern Radar, 2006, 28(12): 69-71,75 | |
| Authors: | WEI Yong-hao YUAN Xiao AN Hong |
| Affiliation: | 1. School of Electronic and Information, Sichuan Univ. , Chengdu 610064, China;2. School of Electronic Ergineering, UESTC, Chengdu 610054, China;3. National EW Laboratory, Chengdu 610036, China |
| Abstract: | Fundamentals of IF(Intermediate Frequency) bandpass signal sampling and quadrature detection are discussed,especially the coherent mixing LPF method and Hilbert transform frequency-shift method.In-depth comprehension of bandpass sampling theorem allows expanding the application fields,and applicable condition,principle diagram and signal-flow graphs are given respectively.These results help to understand and utilize quadrature coherent detection.Finally,simulation examples are given to validate the effectiveness of proposed methods. |
| Keywords: | IF sampling quadrature detection bandpass sampling theorem LPF method HT frequency-shift method |
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