| 摘要: |
| Galileo卫星导航系统在E1频段使用CBOC(6,1,1/11)调制方式取
代原计划的BOC(1,1)调制方式。介绍了CBOC(6,1,1/11)的频谱、实现方式及其相关函数
，并通过仿真计算，对比分析了CBOC(6,1,1/11)和BOC(1,1)调制方式在谱分离系数、根均方
带宽和多径误差包络的差别。结果表明： CBOC(6,1,1/11)和BOC(1,1)频谱相近，但增加了
部分高频分量, 且CBOC(6,1,1/11)不同的实现方式相关函数上有一定的差别； CBOC(6,1,1/
11)在与同频段其它服务信号间的谱分离系数整体上小于BOC(1,1)，降低了系统内和系统间
的干扰； CBOC(6,1,1/11)根均方带宽大于BOC(1,1), 减小了跟踪抖动； CBOC(6,1,1/11)的
多径误差包络整体上小于BOC(1,1)，提高了系统的抗多径能力。 |
| 关键词: 卫星导航系统 CBOC调制 相关函数 谱分离系数 根均方误差 多径误差 |
| DOI： |
|
| 基金项目: |
|
| CBOC Modulation and its Performance Analysis |
| ZHOU Yan-ling,WANG Dai-ping |
| (1.Zhixing College，Hubei University, Wuhan 430012, China;2.Department of Ele
ctronics and Information Engineering, Huazhong University of Science and Techn
ology,Wuhan 430074,China) |
| Abstract: |
| In Galileo satellite navigation system，the original plan of BOC (1,1)
modulation in E1 band was replaced by the CBOC (6,1,1/11) modulation. This pape
r
presents the spectrum, implementation, and autocorrelation function (ACF) of CB
OC (6,1,1/11). Then according to the simulation and computing，the comparison
between the CBOC(6,1,1/11) and BOC(1,1) is evaluated to investigate the differen
ces，including spectral separation factor, root mean square (RMS) bandwidth
and multipath error envelope. The results of the study indicate that the CBOC (6
,1,1
/11) and BOC (1,1) spectrums are similar, but the former adds some highfrequen
c
y component. The CBOC(6,1,1/11) of different implementations have a few differen
ces in the ACF. The spectral separation factors of the CBOC(6,1,1/11) with the o
ther services which are on the same frequency band are smaller than those of BOC
(1,1) on the whole, which is beneficial to reduce the interference between the s
ystems. The RMS bandwidth of the CBOC(6,1,1/11) is larger than that of BOC(1,1),
the former reduces the tracking jitter consequently. The multipath error envelo
pes of CBOC(6,1,1/11) are smaller than those of BOC(1,1) by and large，which ind
icates that the CBOC(6,1,1/11) improves the antimultipath capability. |
| Key words: satellite navigation system CBOC modulation autocorrelation function(ACF) spectral separation factor root
mean square(RMS) multipath mitigation |
《电讯技术》编辑部 