Snapshot RTK with Galileo PRS: A Feasibility Analysis
Cillian O’Driscoll, Cillian O’Driscoll Independent Consultant; Heike Dorner, Belen Castel, Daniel Rubino, Alexander Rügamer, Wolfgang Felber, Fraunhofer IIS
Date/Time: Wednesday, Sep. 21, 2:58 p.m.
Recent work has demonstrated the feasibility of real-time kinematic (RTK) using short snapshots of raw intermediate-frequency (IF) data. At the same time the Fraunhofer Institute for Integrated Circuits IIS has developed a tool capable of capturing GNSS-time synchronized wideband snapshots in both E1 and E6. This tool captures the entire bandwidth of the Galileo public regulated service (PRS) signals in those bands. This naturally raises the possibility of using the PRS signals for snapshot RTK (SRTK): a concept we refer to as SRTK-PRS. In this work we investigate the feasibility of this concept, addressing some of the challenges presented, including: the limitation to only a single constellation; management of aligning the PRS chips with the signal snapshots; and processing a combination of open signals (from standard survey-grade receivers) and PRS signals (from the snapshot tool). We demonstrate that this approach is indeed feasible, and demonstrate fixed RTK solutions over a range of baselines using the SRTK-PRS tool developed in the course of this work.
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