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Sub-Gigahertz Path Loss Measurement Campaign in Marine Environment: A Case Study.

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Summary

Lower frequencies like 169 MHz offer greater communication distances in marine environments. Radio propagation quality is also linked to weather, specifically the dew point index.

Keywords:
data communicationmarine environmentpath losssub-gigahertz bands

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Area of Science:

  • Marine communication systems
  • Radio wave propagation

Background:

  • Effective data communication is crucial for maritime operations.
  • Sub-gigahertz Industrial, Scientific, and Medical (ISM) bands are utilized for various applications.

Purpose of the Study:

  • To characterize radio propagation and data communication performance in a marine setting.
  • To evaluate path loss (PL) for communication between a sailboat and a buoy across different ISM bands.
  • To correlate radio propagation quality with meteorological conditions.

Main Methods:

  • Conducted three radio power measurement campaigns at 169 MHz, 434 MHz, and 868 MHz.
  • Measured signal propagation between a sailboat and a buoy.
  • Collected and analyzed weather data, including the dew point index, during measurements.

Main Results:

  • Lower frequencies (169 MHz) achieved greater communication distances compared to higher frequencies.
  • Radio propagation performance showed a direct dependency on the dew point index.
  • Path loss was evaluated across the tested sub-gigahertz ISM bands.

Conclusions:

  • 169 MHz is more suitable for achieving longer communication ranges in marine environments.
  • Dew point is a significant factor influencing radio propagation quality at sea.
  • Understanding these factors is vital for optimizing marine data communication systems.