| 摘要: |
| 在L1频段上，Galileo系统的授权服务信号L1P和开放服务信号L1F共用中心频点1 575.42
MHz，它们的功率谱部分重叠，相互之间存在干扰。通过仿真研究L1P和L1F信号间的
干扰，对它们的干扰系数、载噪比衰减值进行了详细分析，找出了决定这两种信号间干扰大
小的主
要因素。仿真结果显示，L1P信号受到来自于L1F信号的最大干扰为0.002 dB，来自于CD
MA干
扰的最大值为0.26 dB；L1F受到来自于L1P信号的最大干扰几乎为0 dB，来自于CD
MA干扰的最
大值为0.604 dB。这表明，CDMA干扰是主要干扰源，L1P和L1F信号间的干扰可以忽略。
这主
要受益于L1P信号采用余弦相位的BOC调制，L1F信号采用CBOC调制，使这两个信号的功率谱
重叠部分大大减少，从而干扰系数很小，大大减小了它们间的干扰。 |
| 关键词: 伽利略全球导航卫星系统 系统内部干扰；干扰系数；BOC调制 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目(61004123)；广西自然科学基金资助
项目（2011GXNSFA018155）；广西大学科研基金资助项目(XB2090844,XGL090032) |
|
| Interference analysis between L1F signals and L1P signals of Galileo system |
| HUANG Xu-fang |
| (Department of Computer and Electronic Information, Guangxi University, Nanning
530004,China) |
| Abstract: |
| The Galileo system transmits L1P signal (for public regulated service) and L1F s
ig
nal (for open service) at a center frequency of 1 575.42 MHz in L1 band. The
inter
ference between each other is inevitable due to power spectrum overlap. In this
paper, the interference between L1F and L1P signal is researched, the interfere
nce coefficient and the CNR(Carrier-to-Noise Ratio) degradation are analysed,and
the main factors determing the strength of the two types of signal are found
out. Simulation results show t
hat, the L1P signal suffers about 0.002 dB the maximum interference creat
ed by the L1F signal, and about 0.26 dB by the maximum Code Division Multipl
e Access(CDMA) inter
feren
ce; the L1F signal suffers almost negligible interference from the L1P si
gnal
and about 0.604 dB the maximum CDMA interference. T
he result
indicates that, the CDMA interference is preponderant and drives the total degra
d
ation of intrasystem degradation, and the interference between L1P and L1F sig
n
al is almost negligible. This mainly benefits from L1P signal using cosine pha
se of Binary offset Carrier(BOC) modulation, and L1F signal using Composited Bi
nary offset Carrier(CBOC) modulation, so that the power spectrum of the two sig
nals overlap greatly reduces, the interference coefficient is very small, greatl
y reducing the interference between them. |
| Key words: Galileo system intra system interference interference coefficient BOC modula
tion |
《电讯技术》编辑部 