Galileo Signals Acquisition Using Enhanced Subcarrier Elimination Conversion and Faster Processing

Albu-Rghaif, Ali and Lami, Ihsan and Al-Aboodi, Maher and Van Tor, Patrick and Rogier, Hendrik (2015) Galileo Signals Acquisition Using Enhanced Subcarrier Elimination Conversion and Faster Processing. In: Advances in Computing,Communication and Information Technology- CCIT 2015, 26 - 27 May 2015, Birmingham.

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Abstract

To solve multipath and to enhance the localisation accuracy in a harsh environment, BOC modulation has been adopted in modern GNSS transmission, such as GPS-M-code and Galileo-OS-code signals. The designers of the BOC technique have pointed out that the correlation function becomes ambiguous when the received signal is correlated with the reference BOC signal at code phase resolutions of 0.5 Chip. This has motivated many contributions to resolving this ambiguity, for example, by processing each side of the BOC lobes as a BPSK signal. Our literature survey concluded that solutions claiming to have mitigated this ambiguity actually have resulted in a more complex receiver implementation. The Enhanced Subcarrier Elimination (ESCE) method detailed in this paper proposes combining the two side lobes into a single lobe centered at the main frequency, thus gaining 2dB more signal power as well as reducing the correlation requirements (signal’s mixing and transforming operations) to the half; i.e. accelerating the acquisition process. HaLo-430 platform generated signals used for testing the MATLAB model of ESCE proves that we outperform three of the most used unambiguous methods.

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