Title: An Optimized Acquisition Scheme with Half Interleaving Code Patterns in a QZSS LEX Single Frequency Receiver
Author(s): Huiben Zhang
Published in: Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2016)
September 12 - 16, 2016
Oregon Convention Center
Portland, Oregon
Pages: 417 - 426
Cite this article: Zhang, Huiben, "An Optimized Acquisition Scheme with Half Interleaving Code Patterns in a QZSS LEX Single Frequency Receiver," Proceedings of the 29th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2016), Portland, Oregon, September 2016, pp. 417-426.
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Abstract: The Quasi-Zenith Satellite System (QZSS) L-band Experiment (LEX) signal can carry correction data for real-time precise GNSS applications. Most available LEX receivers must be assisted by GPS/QZSS L1 C/A code tracking, which requires dual frequency antenna and front-end. Alternatively, LEX-only single frequency receiver architecture can be adopted to acquire and track the LEX signal independently. However, LEX signal acquisition occupies massive process time due to the extra computational complexity caused by the code shift keying (CSK) modulation. This paper proposes an optimized LEX signal acquisition algorithm, implements it into an open source software GNSS receiver and adopts the FFT-based Circular Correlation Search in LEX acquisition to reduce acquisition time. Due to the TDM structure in the LEX signal, optimized code patterns are presented to further shorten the short and long code acquisition time. In order to demonstrate the acquisition algorithm, the experiment on processing real LEX signal from the currently operating QZSS satellite named Michibiki was conducted with the developed software LEX receiver.