摘要
FFT辅助的部分相关伪码快捕方法将沿码相位-多普勒频率的二维搜索简化为沿码相位的一维搜索,克服了多普勒频率的影响,大大缩短了PN码捕获时间,适用于中低轨卫星。文中介绍了该方法的基本原理、性能分析和实现方案。实验结果表明,在大多普勒频偏下FFT辅助的部分相关码捕获方法是一种性能优良的伪码捕获方法。
Partial matched correlator based on FFT simplifies two -dimensional （2 - D： code chip and Doppler offset）acquisition to 1 -D（ code chip）. It cuts the acquisition time considerably and is good for LEO satellite. In this paper, the principle, performance and implementation scheme of PN code acquisition using partial matched correlator based on FFT are introduced. A＇conc.lusion can be drawn from the experiment that partial matched correlator based on FFT is an excellent method for PN code acquisition in condition of large Doppler offset.
出处
《电讯技术》
2007年第4期143-146,共4页
Telecommunication Engineering
关键词
低轨卫星
扩频通信
PN码快捕
部分相关器
FPGA
LEO satellite
spread spectrum communication
PN code acquisition
partial matched correlator
FPGA
