北斗二代信号精频捕获算法研究  

On Fined Frequency Acquisition Algorithm for BDⅡ Signal

作　　者：王尔申[1,2] 胡志明[1] 雷虹 姜毅[4] 徐宏伟 

机构地区：[1]沈阳航空航天大学电子信息工程学院,沈阳110136 [2]沈阳航空航天大学辽宁省通用航空重点实验室,沈阳110136 [3]电磁环境效应航空科技重点实验室,沈阳110035 [4]大连海事大学信息科学技术学院,辽宁大连116026

出　　处：《电光与控制》2016年第12期14-17,22,共5页Electronics Optics & Control

基　　金：国家自然科学基金(61571309;61101161);航空科学基金(2011ZC54010);交通运输行业水上智能交通行业重点实验室开放课题;中央高校基本科研业务费(3132016317)

摘　　要：在北斗接收机中,载波的捕获速度和载波频率捕获误差影响着北斗接收机的性能。针对在处理精频捕获时传统算法计算量大的问题,提出利用载波相位对北斗二代导航信号进行精频捕获的算法。首先利用FFT循环相关对北斗信号实现快速捕获,然后通过去除C/A码的连续输入信号之间的相位关系对载波中频进行精频估计。利用卫星导航实验平台采集实际的信号对提出的捕获算法进行验证,结果表明,该算法降低了多普勒频率估计误差,估计误差在10 Hz以内,在卫星信号较弱时多普勒频率估计误差在50 Hz以内。所提算法对北斗二代接收机的设计具有一定的参考价值。The performance of BeiDou receiver is affected by the carrier acquisition speed and carrier frequency acquisition error. Traditional algorithms have a large amount of calculation when calculating the fine frequency, thus an approach is proposed to find the fine frequency through phase relation. Firstly, the algorithm uses the FFT circular correlation to realize the fast acquisition. Then the phase relation of the continuous input signal stripped C/A code in a shorter time is used to estimate the fine frequency. The simulation results show that the algorithm can reduce the Doppler estimation error. According to the analysis, when the input signal is strong, the algorithm can keep the error of the Doppler frequency within 10 Hz. When the input signal is weak, it can keep the error of the Doppler frequency within 50 Hz. The study has certain reference value for research on BeiDou receiver.

关 键 词：北斗卫星导航系统 捕获算法 快速傅里叶变换 精频估计 

分 类 号：O213.2[理学—概率论与数理统计]