Code Tracking Bias Compensation Scheme for the Galileo E1 OS signal

Galileo system uses direct sequence/spread spectrum (DS/SS) as its modulation method. Single delta delay lock loop (Delta-DLL), where Delta is sample duration between early and late correlation values, has been widely used for code tracking in DS/SS systems. When the Delta-DLL is used for code track...

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Bibliographic Details
Published in2008 10th International Conference on Advanced Communication Technology Vol. 1; pp. 525 - 528
Main Authors Seung Hwan Yoo, Seungsoo Yoo, Sun Yong Kim, Sangho Ahn, Seokho Yoon
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.02.2008
Subjects
bias compensation
code tracking
Frequency synchronization
Galileo system
Global Positioning System
Modulation coding
Phase modulation
Propagation delay
Signal generators
Signal processing
single delta delay lock loop
Spread spectrum communication
System testing
tracking bias
Tracking loops
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Summary:Galileo system uses direct sequence/spread spectrum (DS/SS) as its modulation method. Single delta delay lock loop (Delta-DLL), where Delta is sample duration between early and late correlation values, has been widely used for code tracking in DS/SS systems. When the Delta-DLL is used for code tracking in ideal environments, code tracking bias does not arise because the symmetry of the correlation function is not destroyed. However, in multipath (MP) environments, a large code tracking bias arises owing to the asymmetrical correlation function. An MP signal always has a propagation delay time after that of the line of sight signal. Thus, correlation values in the advanced offset region are less distorted than those in the delay offset region. From this observation, we propose an effective tracking bias compensation scheme for the Galileo E1 open service signal.
ISBN:8955191367
9788955191363
8955191359
9788955191356
ISSN:1738-9445
DOI:10.1109/ICACT.2008.4493817