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Performance Limits of GNSS Code-based Precise Positioning: GPS, Galileo & Meta-Signals.

Priyanka Das1,2, Lorenzo Ortega3, Jordi Vilà-Valls1

  • 1Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), University of Toulouse, 31055 Toulouse, France.

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PubMed
Summary
This summary is machine-generated.

This study explores the performance limits of Global Navigation Satellite System (GNSS) receivers. It finds that specific Galileo signals and meta-signals offer promising precise positioning solutions using only code measurements.

Keywords:
Cramér–Rao boundGNSSGPS/Galileo signalsGalileo meta-signalscode-based positioningmaximum likelihood estimationprecise positioningtime-delay estimation

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Area of Science:

  • Satellite Navigation Systems
  • Signal Processing
  • Geodesy

Background:

  • Traditional Global Navigation Satellite System (GNSS) receiver performance is limited by time-delay estimation.
  • This estimation is influenced by GNSS baseband signal resolution, including bandwidth, modulation, autocorrelation, and sampling rate.

Purpose of the Study:

  • To determine the ultimate performance limits of GNSS code-based positioning systems.
  • To assess the feasibility of achieving precise positioning solutions using only GNSS code measurements and identify the conditions required.

Main Methods:

  • Analysis of the Cramér-Rao bound (CRB) and Maximum Likelihood Estimator (MLE) for time-delay estimation.
  • Evaluation of various GPS and Galileo signals, including novel meta-signals, under ideal conditions (no external errors).

Main Results:

  • Calculated time-delay CRB and MLE for GPS L1 C/A, L1C, L5, and Galileo E1 OS, E6B, E5b-I, E5, E5b-E6, and E5a-E6 signals.
  • Identified AltBOC-type signals (Galileo E5 and meta-signals) as capable of supporting precise code-based positioning.

Conclusions:

  • GNSS code-only precise positioning is achievable under specific conditions, particularly with advanced signal designs.
  • AltBOC-type signals present a viable real-time alternative to traditional carrier phase-based precise positioning techniques.