Volume 34 Issue 03
Mar.  2008
Turn off MathJax
Article Contents
Sun Guoliang, Li Yuqi, Zhang Xiaolinet al. FFT-based acquisition method to eliminate influence caused by data modulation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(03): 262-266. (in Chinese)
Citation: Sun Guoliang, Li Yuqi, Zhang Xiaolinet al. FFT-based acquisition method to eliminate influence caused by data modulation[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(03): 262-266. (in Chinese)

FFT-based acquisition method to eliminate influence caused by data modulation

  • Received Date: 29 Jun 2007
  • Publish Date: 31 Mar 2008
  • To achieve higher acquisition accuracy while using FFT(fast Fourier transform)-based algorithm to acquire spread spectrum signal, integration across data bit transition boundaries is necessary. However, performance degradation due to data modulation must be eliminated. Two effects of baseband data shift on acquisition performance, amplitude attenuation and frequency offset of the detected signal in frequency domain, were analyzed. A method to solve this problem was given. This algorithm constructs a complex signal which is free from data modulation, and detects Doppler shift using this signal through FFT. Simulation in MATLAB and FPGA(field programmable gate array)-based implementation of this method was also described. The simulation and experiment results verify that, this method can overcome the problem caused by baseband data shift, and improve acquisition accuracy by one times compared with conventional method in the same predetection integration time.

     

  • loading
  • [1] Holmes J K, Chen C C. Acquisition time performance of PN spread-spectrum systems[J]. IEEE Transactions on Communication,1977,25(8):778-784 [2] Chawla K K, Sarwate D V. Parallel acquisition of PN sequences in DS/SS systems[J]. IEEE Transactions on Communication,1994,42(5):2155-2164 [3] 朱昆,黄启华,郑玉簋. FFT在高动态扩频信号快速捕获中的应用 张洪涛.北京航空航天大学第三届研究生学术论坛论文集.北京:北京航空航天大学研究生院,2006:120-125 Zhu Kun,Huang Qihua, Zheng YuGui. Implementation and analysis of an FFT approach for fast spread spectrum code acquisition in dynamic circumstance Zhang Hongtao. The Attendance Guide of 3rd Academic Forum for Graduate Students at Beihang University.Beijing: Graduate School,Beijing University of Aeronautics and Astronautics,2006:120-125(in Chinese) [4] Tsui James Bao-Yen. Fundamentals of global positioning system receiver: a software approach [M]. New York:John Wiley & Sons Inc,2000:137-138 [5] 郭肃丽,刘云飞.一种基于FFT的伪码快捕方法[J].无线电通信技术,2003,29(1):11-13 Guo Suli, Liu Yunfei. An FFT-based approach for the fast acquisition of PN Code[J].Radio Communication Reference,2003,29(1):11-13(in Chinese) [6] 胡建波,杨莘元,卢满宏.一种基于FFT的高动态扩频信号的快捕方法[J].遥控遥测,2004,25(6):19-24 Hu Jianbo, Yang Xinyuan, Lu Manhong. An FFT based method for fast acquisition of high dynamic DS spread spectrum signals[J]. Telemetry and Telecontrol, 2004,25(6):19-24(in Chinese)
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Article Metrics

    Article views(3106) PDF downloads(1388) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return