摘要
针对传统时域串行捕获和基于FFT的并行码相位捕获算法存在的捕获速度慢与复杂度高问题,提出了基于PMF-FFT的改进捕获算法。在捕获过程中,将相差一个码片的64段伪码之和作为本地伪码,对叠加后的信号进行PMF捕获,利用FFT来对部分匹配滤波的结果进行频偏纠正,通过取模得到相关值,并进行门限判定。通过卫星导航实验平台采集实际中频数据对PMFFFT算法进行验证,结果表明,该算法可以加快码步进,减少运算量,缩短捕获时间。
For Beidou satellite signal, traditional acquisition algorithms are analyzed. An improved acquisition algorithm based on PMF-FFT is then proposed, since the time domain serial acquisition algorithm and the FFT based parallel code phase acquisition algorithm suffer slow acquisition speed and high complexity. In the process of acquisition, the difference between a code of 64 pseudo code is set as a local pseudo code signal. After the superposition of PMF capture, by using the FFT algorithm to partially matched filtering results of frequency offset correction,the correlation values were obtained after die drawing. Finally, the threshold is determined. The results show that the algorithm can speed up the code step, reduce the amount of calculation and shorten the acquisition time .
作者
王尔申
张双阳
曲萍萍
别玉霞
庞涛
胡志明
WANG Ershen;ZHANG Shuangyang;QU Pingping;BIE Yuxia;PANG Tao;HU Zhiming(College of Electronic and Information Engineering;Liaoning General Aviation Key Laboratory,Shenyang Aerospace University, Shenyang 110136,China)
出处
《沈阳航空航天大学学报》
2018年第2期82-87,共6页
Journal of Shenyang Aerospace University
基金
国家自然科学基金(项目编号:61571309)
辽宁省"百千万人才"工程项目
辽宁省高等学校优秀人才支持计划资助(项目编号:LR2016069)
航空科学基金(项目编号:2015ZC54010)
辽宁省教育厅项目(项目编号:L201716)
关键词
北斗卫星导航系统
部分匹配滤波器
快速傅里叶变换
捕获算法
Beidou navigation satellite system
partially matched filter
fast Fourier transform
acquisition algorithm
