摘要
快速准确地实现伪码捕获是扩频通信研究的关键。在实际应用中,通常会存在噪声干扰和多普勒效应的影响,导致捕获难度变大。传统的串行捕获或并行捕获法存在捕获时间长、低信噪比环境下难以实现捕获或难以克服多普勒效应的影响等。详细研究了多普勒频移对伪码捕获的影响,利用FFT的算法进行伪码捕获,并对多普勒频移进行修正,通过仿真,证明了此种方法可以在低信噪比和较大多普勒效应下准确地实现伪码的快速捕获。
Fast and accurate pseudo-code acquisition is the key technology of spread spectrum communication research.In practical application,there are usually interference from noise and doppler effect,which make acquisition more difficult.Traditional serial acquisition or parallel acquisition methods have some disadvantages,such as long acquisition time,difficult acquisition under low signal-to-noise ratio(SNR) environment,or difficult to overcome the influence of doppler effect.In this paper,the influence of doppler frequency shift on pseudo-code acquisition is studied in detail.The algorithm of FFT is used to capture pseudo-code,and to correct the doppler frequency shift.The simulation results show that this method can accurately achieve the fast acquisition of pseudo-code under low SNR and more doppler effect.
作者
王守亚
吴琰
WANG Shou-ya(School of Electronic Engineering,Huainan Normal University,Huainan Anhui 232038,China)
出处
《长春工程学院学报（自然科学版）》
2019年第1期82-85,共4页
Journal of Changchun Institute of Technology：Natural Sciences Edition
基金
安徽省教育厅自然科学重点研究项目(KJ2018A0464)
淮南师范学院校级科研项目(2017xj80)
关键词
伪码
捕获
信噪比
多普勒效应
pseudo-code
acquisition
signal-to-noise ratio
doppler effect
