GALILEO SIGNALS ACQUISITION USING ENHANCED SUBCARRIER ELIMINATION CONVERSION AND FASTER PROCESSING
Published In: 3RD INTERNATIONAL CONFERENCE ON ADVANCES IN COMPUTING, COMMUNICATION AND INFORMATION TECHNOLOGY
Author(s): ALI ALBU-RGHAIF , HENDRIK ROGIER , IHSAN A. LAMI , MAHER AL-ABOODI , PATRICK VAN TORRE
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;
- Publication Date: 27-May-2015
- DOI: 10.15224/978-1-63248-061-3-13
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OGSR: A LOW COMPLEXITY GALILEO SOFTWARE RECEIVER USING ORTHOGONAL DATA AND PILOT CHANNELS
Published In: 3RD INTERNATIONAL CONFERENCE ON ADVANCES IN COMPUTING, COMMUNICATION AND INFORMATION TECHNOLOGY
Author(s): ALI ALBU-RGHAIF , IHSAN A. LAMI , MAHER AL-ABOODI
Abstract: To improve localisation accuracy and multipath rejection, the Galileo-OS signal offers a new modulation with efficient power distribution technique between the two data and pilot navigation components. To achieve the full benefits of this modulation, a robust acquisition and tracking methods must be deployed. For example, using two parallel correlation channels to acquire these data and pilot will gain 3dB over using a single channel acquisition correlating with either one of them. However, dual channel SW receivers cost more processing overheads. In this paper, the authors propose to orthogonalise the received data and pilot signals so to enable their acquisition in a single correlation channel bandpass sampling receiver. Our simulation results, using Simulink, prove that OGSR performance is maintained (preserving the 3dB gain) with less processing time while the implementation complexity is reduced by 50%.
- Publication Date: 27-May-2015
- DOI: 10.15224/978-1-63248-061-3-14
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- Downloads: 0