A GNSS Code Tracking Scheme Based in Slope Difference of Correlation Outputs 


Vol. 33,  No. 6, pp. 505-511, Jun.  2008


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  Abstract

The global navigation satellite system (GNSS) is using a direct sequence/spread spectrum (DS/SS) modulation. In order to recover the information data, the DS/SS system first performs a two-step synchronization process: acquisition and tracking. The acquisition process adjusts the phase difference between the received and locally generated acquisition sequences within ± Tc/2 or less, where Tc is the chip period. The tracking process performs fine synchronization. In this paper, we focus on the tracking issue. The single delta delay locked loop (Δ-DLL) is the optimal tracking scheme for a GNSS in the absence of multipath signals, where Δ means the spacing between the early and late correlation time offset. In the multipath environments, however, the Δ-DLL suffers from huge estimation bias (denoted by β) caused by distorted correlation values. Although some modified schemes such as a Δ-DLL with a narrow Δ and a double delta DLL (Δ(2)-DLL) were proposed to reduce the estimation bias, they cannot remove the estimation bias completely and need more accurate acquisition process. This paper proposes a novel tracking scheme that can dramatically reduce the estimation bias, using the maximum slope change among the correlation outputs.

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  Cite this article

[IEEE Style]

S. Yoo, S. H. Yoo, D. Chong, S. Ahn, S. Yoon, S. Y. Kim, "A GNSS Code Tracking Scheme Based in Slope Difference of Correlation Outputs," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 6, pp. 505-511, 2008. DOI: .

[ACM Style]

Seungsoo Yoo, Seung Hwan Yoo, Dahae Chong, Sangho Ahn, Seokho Yoon, and Sun Yong Kim. 2008. A GNSS Code Tracking Scheme Based in Slope Difference of Correlation Outputs. The Journal of Korean Institute of Communications and Information Sciences, 33, 6, (2008), 505-511. DOI: .

[KICS Style]

Seungsoo Yoo, Seung Hwan Yoo, Dahae Chong, Sangho Ahn, Seokho Yoon, Sun Yong Kim, "A GNSS Code Tracking Scheme Based in Slope Difference of Correlation Outputs," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 6, pp. 505-511, 6. 2008.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880