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下一代GNSS导航系统中的MBOC调制及性能分析 被引量:3

Performance analysis of MBOC modulation in next generation GNSS
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摘要 下一代全球导航卫星系统中将采用混合二进制偏移载波信号调制方式,其中Galileo E1 OS拟采用复合副载波调制技术,GPS L1C拟采用时分多副载波调制技术。针对混合二进制偏移载波信号调制方式,首先对相关调制技术进行了描述,并通过Matlab仿真,分别从功率谱密度、热噪声码环跟踪误差和多径误差包络三方面,将MBOC(6,1,1/11)与伽利略系统最初拟采用的BOC(1,1)和传统GPS导航系统中的BPSK(1)信号调制方式性能进行了对比分析。结果显示,MBOC(6,1,1/11)具有更加丰富的高频分量和更好的自相关特性,且热噪声码环跟踪误差性能和抗多径性能均优于BOC(1,1)和BPSK(1)调制。 The next generation GNSS would choose the MBOC(Multiplexed Binary Offset Carrier) as its signal modulation mode,in which Galileo E1 OS plan to apply the CBOC(Composite Binary Offset Carrier) technique,and GPS L1C plan to apply TMBOC(Time-multiplexed Binary Offset Carrier) technique.In this paper,the related modulation techniques are introduced,and the signal modulation methods of MBOC(6,1,1/11),BOC(1,1) and BPSK(1) are compared and analyzed from three aspects,i.e.power spectral density,thermal noise code loop tracking error and multipath mitigation.BOC(1,1) and BPSK(1) are originally adopted by Galileo and traditional GPS respectively.The results show that the MBOC(6,1,1/11) has more plentiful high-frequency components and more narrower autocorrelation peak curve,therefore the anti-multipath performance is more optimal,and the thermal noise code loop tracking errors are more effectively reduced.
出处 《中国惯性技术学报》 EI CSCD 北大核心 2010年第4期434-438,共5页 Journal of Chinese Inertial Technology
基金 国家自然科学基金项目(50975049) 国家重点基础发展研究计划(973计划)资助项目(2009CB724002)
关键词 混合二进制偏移载波 复合副载波 时分多副载波 调制方式 multiplexed binary offset carrier composite binary offset carrier time multiplexed binary offset carrier modulation mode
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