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Optimized Bit-Packing for Bit-Wise Software-Defined GNSS Radio

Zachary L. Clements,Peter A. Iannucci,T. Humphreys,T. Pany

Published 2021 in Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021)

ABSTRACT

One way that software-defined radio (SDR) receivers for Global Navigation Satellite Systems (GNSS) differ from traditional GNSS receivers is that radio-frequency (RF) data serialization becomes more than a mere implementation detail deep within some proprietary integrated circuit. GNSS-SDR receivers obtain positioning, navigation, and timing (PNT) solutions in software on a general-purpose processor, enabling rapid development of new PNT technologies. Data serialization and deserialization is the lifeblood of GNSS SDR, and a fundamental tool for cooperation among researchers. The existing ION Metadata Standard facilitates the exchange of RF data with a formal notation (schema) for downconversion, bit ordering, byte ordering, and stream multiplexing. But clear notation is only a first step: serialization directly impacts both computational cost and tracking performance in GNSS-SDR receivers. This is particularly true for “bit-wise” receivers, which re-order computation to loop over bit positions of varying magnitude rather than over samples of varying index. Such receivers prefer input data orderings that separate e.g. runs of high-order bits from runs of low-order bits. This paper addresses the Standard’s current inability to describe such a format. However, because it is not always possible to re-order data in hardware to perfectly match the needs of the software—and there are indeed good reasons not to do so, such as version skew—this paper also considers bit-packing for bit-wise SDRs more generally. Taking into account resource costs both in hardware and

PUBLICATION RECORD

  • Publication year

    2021

  • Venue

    Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021)

  • Publication date

    2021-10-13

  • Fields of study

    Not labeled

  • Identifiers
    DOI 10.33012/2021.18015
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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