| 大多普勒偏移下直接序列扩频信号捕获新方法 |
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| 引用本文： | 董智红,吴嗣亮. 大多普勒偏移下直接序列扩频信号捕获新方法[J]. 系统工程与电子技术, 2008, 30(8) |
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| 作者姓名： | 董智红 吴嗣亮 |
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| 作者单位： | 北京理工大学电子工程系,北京,100081 |
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| 摘 要： | 针对具有大多普勒偏移的直接序列扩频信号捕获问题,提出一种基于快速傅里叶变换(FFT)的多普勒和伪码分别并行搜索的捕获新方法.该方法利用伪码二相调制特性,通过乘法消除伪码影响,得到多普勒估计值,在此基础上运用圆周相关法得到的伪码相位估计值.计算机仿真表明,它能更快、更高精度地完成多普勒频率一伪码相位的二维搜索,且捕获时间与多普勒偏移大小无关,尤其适用于大多普勒环境.
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| 关 键 词： | 雷达 捕获 快速傅里叶变换(FFT) 大多普勒偏移 直接序列扩频信号 |
New acquisition method for DSSS with large Doppler |
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| DONG Zhi-hong,WU Si-liang. New acquisition method for DSSS with large Doppler[J]. System Engineering and Electronics, 2008, 30(8) |
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| Authors: | DONG Zhi-hong WU Si-liang |
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| Abstract: | Aiming at the acquisition problem of direct sequence spread-spectrum(DSSS) signals with large Doppler offset,a new method based on fast Fourier transform(FFT) is proposed.This method estimates Doppler frequency by eliminating PN code two-phase modulation effect,then gains code phase estimation by circular correlation.The parallel search of Doppler and code phase makes acquisition time hold a constant value.Computer simulations indicate that the acquisition time with this method is much shorter than others and it is independent of Doppler offset. |
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| Keywords: | radar acquisition FFT large Doppler offset direct sequence spread-spectrum signals |
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