摘要
针对北斗弱信号,采用相干累加的方法进行捕获,并在此基础上对其进行改进。与比特跳变估计算法相比,该算法在不剔除比特跳变数据块的基础上,将积分时间延长至20 ms,提高了数据利用率。仿真结果表明,本文的方法能够捕获到信噪比低至-38 d B的北斗弱信号,且具有较高的捕获概率。
Improved acquisition algorithm based on coherent accumulation method is proposed in order to solve the BD weak signal. This algorithm can extend the coherent accumulation time to 20 ms and increase the data utilization ratio without eliminating the data block compared with the estimation algorithm of data transition. The simulation result shows that the proposed algorithm can capture the weak signal in BDS as low as 38 dB SNR and have higher acquisition probability.
作者
张瑜
郭里婷
Zhang Yu;Guo Liting(College of Physics and Information Engineering, Fuzhou University, Fuzhou 350108)
出处
《微型机与应用》
2017年第24期8-10,15,共4页
Microcomputer & Its Applications
关键词
北斗弱信号
相干累加
捕获算法
BD weak signal
coherent accumulation
acquisition algorithm
