首页 | 本学科首页   官方微博 | 高级检索  
     

一种高动态直扩接收机快速码捕获方法
引用本文:徐峰,邵定蓉,李署坚. 一种高动态直扩接收机快速码捕获方法[J]. 北京航空航天大学学报, 2007, 33(6): 672-676
作者姓名:徐峰  邵定蓉  李署坚
作者单位:北京航空航天大学 电子信息工程学院, 北京 100083
摘    要:对于工作在高动态环境下的扩频接收机,在基于数字匹配滤波器的基础上,提出了一种高折叠倍数匹配滤波器和FFT相结合的捕获方法,将传统的基于信号载波频率和码相位的二维搜索过程变为基于码相位的一维搜索过程.给出了32折叠匹配滤波器在FPGA中的实现框架,通过对折叠倍数和占用系统资源的关系的仿真,可以看出,折叠倍数越大,占用系统资源越少.当输入信号的信噪比在-20 dB时,比传统采用二维搜索捕获方法的捕获速度有很大的提高.由于该方法具有捕获速度快和占用系统资源少的特点,经实际验证适用于高动态环境下的快速码捕获. 

关 键 词:接收机   快速傅里叶变换   现场可编程门阵列
文章编号:1001-5965(2007)06-0672-05
收稿时间:2006-08-10
修稿时间:2006-08-10

Fast PN code acquisition for DSSS receiver in high dynamic situation
Xu Feng,Shao Dingrong,Li Shujian. Fast PN code acquisition for DSSS receiver in high dynamic situation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2007, 33(6): 672-676
Authors:Xu Feng  Shao Dingrong  Li Shujian
Affiliation:School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
Abstract:For direct sequence spectrum system(DSSS) receiver in high dynamic situation,a fast PN code acquisition method was proposed.The acquisition method based on high-folded digital matched filter(DMF) and FFT is able to convert the traditional two-dimensional search method to one-dimensional search.The realization frame of 32-folder DMF in FPGA was put forward.The simulation focused on the folder multiple and system resource shows that the larger the folder multiple is,the lesser the system resource costs.When the input signal SNR is-20 dB,the acquisition speed of this method is much faster than the traditional methods.This method has good characteristics of fast acquisition and system resource expended lower.Practical engineering verification shows that it can be used in high dynamic situation.
Keywords:receiver  fast Fourier transforms(FFT)  field programmable gate arrays(FPGA)
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《北京航空航天大学学报》浏览原始摘要信息
点击此处可从《北京航空航天大学学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号