计算机应用 ›› 2010, Vol. 30 ›› Issue (8): 2214-2217.

• 网络与通信 • 上一篇    下一篇

高动态环境下结合频谱校正的长周期伪码捕获

庞统1,张天骐2,刘燕丽2,杜晓华2   

  1. 1. 重庆邮电大学 信号与信息处理重庆市重点实验室
    2.
  • 收稿日期:2010-02-03 修回日期:2010-04-07 发布日期:2010-07-30 出版日期:2010-08-01
  • 通讯作者: 庞统
  • 基金资助:
    国家自然科学基金-中物院NSAF联合基金项目;基于图形处理器的高性能计算;重庆市科委自然科学基金项目;重庆市教委自然科学基金项目

Capture of long-period PN code using spectrum correction in high dynamic doppler shift situation

  • Received:2010-02-03 Revised:2010-04-07 Online:2010-07-30 Published:2010-08-01

摘要: 针对基于快速傅里叶变换(FFT)的伪码捕获过程中出现的能量泄漏和扇贝损失,通过对一种基于分段匹配滤波—快速傅里叶变换(PMF-FFT)的伪码捕获方法的分析,提出了使用频谱校正的方法来解决这些问题。对FFT后的功率谱最大值进行频谱校正后,提高了最大幅值,同时抑制了旁瓣的干扰,得到了更为精确的多普勒频偏,这样就能获得更高的检测概率。同时给出了基于该算法的信号模型和理论分析的表达式,在理论分析的基础上,使用计算机进行仿真,证明该方法有良好的捕获效果。

关键词: 频谱校正, 伪码捕获, 高动态环境, 扇贝损失, 功率谱

Abstract: For the problem of power leakage and scallop loss in PN code capture that bases on Fast Fourier Transform (FFT), spectrum correction was used according to the analysis of method based on the PMF-FFT. While spectrum correction of the maximum power spectrum after FFT, the maximum amplitude was increased, the sidelobe interference was restrained, and a more accurate Doppler shift was obtained, so that a higher detection probability was got. At the same time, signal model and theoretical analysis expression based on this algorithm were shown. On the basis of the theoretical analysis, the computer simulation results show that the method has good capture results.

Key words: spectrum correction, PN code capture, high dynamic environment, scallop loss, power spectrum