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Demodulation Method for Loran-C at Low SNR Based on Envelope Correlation-Phase Detection.

Jiangbin Yuan1,2,3, Wenhe Yan1,2,3, Shifeng Li1,2,3

  • 1National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China.

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|August 23, 2020
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Summary

A new Loran-C demodulation method improves reliability for global navigation satellite system (GNSS) backups. This envelope correlation-phase detection (EC-PD) method significantly reduces noise and skywave interference (SWI), enhancing data availability.

Keywords:
Loran-Cdata demodulationenvelope correlationskywave interference

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Area of Science:

  • Navigation Systems Engineering
  • Signal Processing
  • Radio Navigation

Background:

  • Loran-C serves as a critical backup and supplementary system for Global Navigation Satellite Systems (GNSS).
  • Existing Loran-C demodulation techniques are susceptible to noise and skywave interference (SWI), limiting their effectiveness.
  • Enhanced reliability of Loran-C is crucial for robust navigation infrastructure.

Purpose of the Study:

  • To propose and evaluate a novel Loran-C demodulation method to mitigate noise and SWI.
  • To improve the signal-to-noise ratio (SNR) and data availability of Loran-C signals.
  • To enhance the engineering application value of the Loran-C system as a GNSS backup.

Main Methods:

  • Development of a Loran-C demodulation method based on envelope correlation-phase detection (EC-PD).
  • Implementation of two EC schemes: moving average-cross correlation and matched correlation.
  • Mathematical modeling of EC, SNR gain calculation, and EC scheme selection criteria.

Main Results:

  • The proposed EC-PD method achieved a demodulation SNR threshold of -2 dB under Gaussian channels, a 12.5 dB improvement.
  • The probability of a negative demodulated SNR threshold under SWI reached 0.78, a 26-fold increase.
  • Average data availability was 3.3 times higher compared to existing methods.

Conclusions:

  • The novel EC-PD demodulation method significantly enhances Loran-C performance in noisy and interfered environments.
  • The method demonstrates superior SNR gain and data availability, validating its engineering application value.
  • This advancement reinforces Loran-C's role as a dependable backup for GNSS.