基于BOC调制的伪卫星抗多径性能研究与分析  

Research and analysis on anti⁃multipath characteristic of pseudolite based on BOC modulation

作　　者：刘晨 刘开琦 华宇[1,2] LIU Chen;LIU Kaiqi;HUA Yu(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,陕西西安710600 [2]中国科学院大学,北京100049

出　　处：《电子设计工程》2021年第19期168-173,共6页Electronic Design Engineering

摘　　要：针对室内环境下伪卫星信号易受多径效应影响的情况,提出采用BOC调制来对抗伪卫星信号多径效应的设计思路。对几种不同的BOC调制方式以及传统的BPSK调制方式的多径误差包络、Gabor带宽进行了比较,仿真结果表明,当直达信号相对反射信号的幅度(Signal to Multipath Ratio,SMR)为-6 dB、超前减滞后码间距为30 ns、预相关带宽为30 MHz时,BOC(10,10)调制的多径误差最先趋于零。在射频前端带宽为20 MHz时,BOC(10,10)调制的Gabor带宽最大,其抗多径性能最好。Aiming at the situation that pseudolite signals are susceptible to multipath effects in indoor environments,a design idea of using BOC modulation to counter the multipath effects of pseudolite signals is proposed.The multipath error envelope and Gabor bandwidth of several different BOC modulation methods and traditional BPSK modulation methods are compared.The simulation results show that when the amplitude of the direct signal relative to the reflected signal(Signal to Multipath Ratio,SMR)is-6 dB,the lead minus lag spacing is 30 ns,and the precorrelation bandwidth is 30 MHz,the multipath error of BOC(10,10)modulation first tends to zero.When the RF front⁃end bandwidth is 20 MHz,the Gabor bandwidth of BOC(10,10)modulation is the largest,and its anti⁃multipath performance is the best.

关 键 词：伪卫星 室内定位 多径效应 BOC调制 频谱分析 

分 类 号：TN961[电子电信—信号与信息处理]