| 基于延时相乘结构的直扩载波最优检测 |
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| 引用本文： | 石明军,徐振平,肖立民,周世东,姚彦.基于延时相乘结构的直扩载波最优检测[J].清华大学学报(自然科学版),2009(7). |
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| 作者姓名： | 石明军 徐振平 肖立民 周世东 姚彦 |
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| 作者单位： | 清华大学电子工程系;国防科技大学电子科学与工程学院; |
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| 基金项目： | 国家“九七三”重点基础研究项目(2007CB310608) |
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| 摘 要： | 针对直接序列扩频信号在通信、导航和雷达等应用中具有低信噪比和低截获概率等特点,给信号侦察带来很大困难,提出了一种基于延时相乘结构的载波信号最佳检测方法。通过推导检测器的输出信噪比,研究了延时、带宽和输出信噪比的关系,得到了最优的参数设置方法。分析表明:在已知部分参数下,延时为零而且匹配滤波时检测器性能最佳;在未知参数条件下,当延时与带宽之积为0.4时,检测器性能达到最佳。在此基础上,分析了检测器的性能,并通过仿真实验验证了提出方法的有效性。
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| 关 键 词： | 直接序列扩频 延时相乘 载波检测 |
Carrier detection of direct sequence spread signals based on a delay-and-multiply device |
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| SHI Mingjun,XU Zhenping,XIAO Limin,ZHOU Shidong,YAO Yan.Carrier detection of direct sequence spread signals based on a delay-and-multiply device[J].Journal of Tsinghua University(Science and Technology),2009(7). |
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| Authors: | SHI Mingjun XU Zhenping XIAO Limin ZHOU Shidong YAO Yan |
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| Institution: | 1.Department of Electronic Engineering;Tsinghua University;Beijing 100084;China;2.School of Electronic Science and Engineering;National University of Defense Technology;Changsha 410073;China |
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| Abstract: | Direct sequence spread spectrum signals are now widely used for communications,navigations systems and radar due to their low signal-to-noise ratios(SNR) and low probability of interception.However,spectrum surveillance of DSSS signals is difficult.Thus,a carrier detection method was developed based on delay-and-multiplication pre-filters.The relations between the delay,bandwidth and output SNR are used to idenfity the optimal system parameters.A theoretical analysis shows that with known partial parameters... |
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| Keywords: | direct sequence spread spectrum delay-and-multiply carrier detection |
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