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Research on Covert Communication in Satellite-Ground-Integrated Sensor Networks Based on FH-DL-MPWFRFT.

Lei Ni1, Yichao Cai1, Xiaobai Li1

  • 1Early Warning Intelligence Department, Air Force Early Warning Academy, Wuhan 430019, China.

Sensors (Basel, Switzerland)
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel secure communication method for satellite networks using frequency-hopping double-layer multi-parameter weighted fractional Fourier transform (FH-DL-MPWFRFT). The technique enhances anti-interception capabilities, making signals difficult to demodulate even for eavesdroppers.

Keywords:
physical layer securitypolarization modulationsatellite–ground-integrated sensor networkweighted fractional Fourier transform

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Area of Science:

  • Information Security
  • Signal Processing
  • Satellite Communications

Background:

  • Satellite-ground-integrated sensor networks require enhanced physical layer security for covert communications.
  • Existing methods may lack sufficient anti-interception capabilities against sophisticated eavesdropping.

Purpose of the Study:

  • To propose a novel dual-polarization constellation joint modulation scheme for improved covert communication in satellite networks.
  • To enhance physical layer security against interception using advanced signal processing techniques.

Main Methods:

  • Developed a frequency-hopping double-layer multi-parameter weighted fractional Fourier transform (FH-DL-MPWFRFT) scheme.
  • Integrated weighted fractional Fourier transform (WFRFT) for constellation confusion and frequency-hopping (FH) phase scrambling for encryption.
  • Established a secure transmission model for satellite-ground networks, analyzing dual-polarization signal mechanisms.

Main Results:

  • The proposed FH-DL-MPWFRFT scheme significantly improves waveform-level anti-interception performance compared to non-FH methods.
  • Even with partial parameter knowledge, eavesdroppers faced high symbol error rates (SER) around 0.4-0.5 for QPSK and 4PM signals.
  • Demonstrated the difficulty of effective demodulation for unauthorized receivers.

Conclusions:

  • The FH-DL-MPWFRFT scheme offers a robust solution for secure covert communications in satellite-ground networks.
  • The dual-polarization modulation effectively enhances physical layer security and resists interception.
  • The proposed method provides a significant advancement in securing satellite communication systems.