摘要
文章提出一种将载波与码相位分离的载波频偏估计算法。该算法可以高精度、快速地估计卫星信号的载波频偏。算法的主要思想是:在对卫星数字中频信号下变频后,将I、Q2路信号直接做乘法运算,实现二相码相位与载波频偏的分离,然后对信号进行FFT频谱分析和频率精细估计,实现载波频偏的精确估计。仿真实验表明此算法简单易行,可以实现高动态扩频信号的捕获,适用于导航接收机的开发。此外,此算法为近地轨道(LEO)通信领域的研究提供了一个新思路。
This paper proposes a carrier-frequency offset estimation algorithm for separating carrier and code phase.The algorithm can estimate quickly carrier-frequency of satellite signal at a high-accuracy level.The algorithm multiplies signal I by Q directly to reach the aim of binary code phase separation after Digital Down Conversion（DDC）.Then,the exact estimation of carrier-frequency offset is accomplished by FFT spectrum analysis and fine frequency estimation.The simulation experiments demonstrate that the algorithm can capture high dynamic spread spectrum signal,and that it is easy to operation and applicable to the development of navigation receiver.Moreover,it provides a new approach for the research on Low Earth Orbit（LEO） communication.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第9期1359-1362,1371,共5页
Journal of Hefei University of Technology：Natural Science
关键词
多普勒频偏
码相位分离
FFT频谱分析
频率精细估计
Doppler offset
separation of code phase
FFT spectrum analysis
fine frequency estimation
