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An Unambiguous Synchronization Scheme for GNSS BOC Signals Based on Reconstructed Correlation Function.

Xiyan Sun1,2,3, Shaojie Song1,2, Yuanfa Ji1,2,3

  • 1Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, China.

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Summary
This summary is machine-generated.

A new method for Binary Offset Carrier (BOC) signal synchronization eliminates ambiguity and false locks by reconstructing the correlation function. This approach improves Global Satellite Navigation System (GNSS) performance, outperforming conventional techniques in de-blurring and multipath mitigation.

Keywords:
Global Satellite Navigation System (GNSS)binary offset carrier (BOC)reconstruction correlation functionsynchronizationunambiguous

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Area of Science:

  • Satellite Navigation Systems
  • Signal Processing
  • Modulation Techniques

Background:

  • Binary Offset Carrier (BOC) modulation is increasingly used in Global Satellite Navigation Systems (GNSS).
  • The multi-peak nature of BOC auto-correlation functions (ACF) can lead to false locks and synchronization ambiguity.
  • Existing methods struggle to fully resolve these synchronization issues in BOC signals.

Purpose of the Study:

  • To propose an unambiguous synchronization method for BOC signals.
  • To address the false lock and synchronization ambiguity problems caused by BOC ACF.
  • To enhance the acquisition and tracking performance of GNSS receivers.

Main Methods:

  • Developed a reconstructed correlation function based on signal properties.
  • Utilized a shape code vector to derive the general cross-correlation function (CCF) expression for BOC signals.
  • Decomposed the signal correlation function into a matrix form of trigonometric functions and reconstructed cross-correlation using two local signals.

Main Results:

  • The proposed method successfully eliminated side-peak threats and synchronization ambiguity in BOC signals.
  • Achieved superior de-blurring ability and detection probability compared to conventional approaches.
  • Demonstrated improved tracking performance with a single zero-crossing in the phase discrimination function, removing false lock points.

Conclusions:

  • The reconstructed correlation function method provides unambiguous synchronization for BOC signals.
  • The technique offers enhanced performance in terms of detection probability, code tracking error, and multipath mitigation.
  • The proposed method is a viable alternative to existing techniques like Autocorrelation Side-Peak Cancellation (ASPeCT).