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Precise Loran-C Signal Acquisition Based on Envelope Delay Correlation Method.

Wenhe Yan1,2,3, Kunjuan Zhao1,2,3, Shifeng Li1,2,3

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

Sensors (Basel, Switzerland)
|April 25, 2020
PubMed
Summary

A new Loran-C signal acquisition method effectively suppresses noise and interference using envelope delay correlation and linear digital averaging. This enhances Loran-C

Keywords:
Loran-Ccross-rate interferenceenvelope delay correlationsignal acquisition

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Area of Science:

  • Navigation Systems
  • Signal Processing
  • Radio Navigation

Background:

  • Loran-C is a vital backup and supplement to Global Navigation Satellite Systems (GNSS).
  • Existing Loran-C signal acquisition techniques are vulnerable to noise and cross-rate interference (CRI).

Purpose of the Study:

  • To propose and evaluate a novel Loran-C signal acquisition method.
  • To enhance the reliability of Loran-C as a GNSS backup.

Main Methods:

  • An envelope delay correlation acquisition method combined with linear digital averaging (LDA) was developed.
  • Simulations were conducted to analyze parameter selection and performance.
  • Real Loran-C signals were used for experimental verification.

Main Results:

  • The method achieves over 90% acquisition probability with a signal-to-noise ratio (SNR) of -16 dB and an error < 1 μs.
  • It suppresses CRI effectively, with an acquisition error < 5 μs at a signal-to-interference ratio (SIR) of -5 dB.
  • Reliable detection of Loran-C signals up to 1500 km was demonstrated, even at low SNR.

Conclusions:

  • The proposed envelope delay correlation and LDA method offers accurate and reliable Loran-C signal acquisition.
  • This advancement strengthens the role of Loran-C as a robust backup for GNSS.