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Measurement of Power Density from Marine Radar

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D.W. Peak, D.L. Conover, W.A. Herman, R.E. Shuping · 1975

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Marine radar systems generate extremely high power density EMF exposures that require careful measurement and safety protocols.

Plain English Summary

Summary written for general audiences

This 1975 government report documented power density measurements from marine radar systems, establishing baseline radiation levels from ship-based radar equipment. The research focused on quantifying electromagnetic field exposure levels that maritime workers and nearby populations might encounter from these high-powered radar installations.

Why This Matters

This early government documentation of marine radar power density represents crucial baseline research from an era when EMF exposure standards were still being developed. Marine radar systems operate at extremely high power levels - often thousands of times stronger than your home WiFi router - making accurate measurement critical for worker safety protocols. What makes this particularly relevant today is that maritime radar technology has only become more powerful and prevalent, yet many of the safety assumptions we rely on trace back to research from this period. The reality is that marine radar creates some of the most intense civilian EMF exposures outside of industrial settings, yet crew members and port workers often lack adequate protection or even awareness of exposure levels.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 9.33-9.5 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 9.33-9.5 GHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Study Details

To estimate the range and magnitude of microwave exposure from marine radar and to determine if theoretically calculated power densities, using manufacturer's nominal parameters, are comparable to experimentally measured power densities.

Measurements were made on small craft radar in the Miami-Ft. Lauderdale, Florida, and Mobile, Alabam...

Tables 2, 3, 4 and 5 present the results of empirical measurements and compare them with theoretical...

In general, the approximate power densities in the far fields of marine radar units may be computed using conventional antenna relationships and nominal manufacturers' specifications for the radar parameters. It is unlikely that personnel would normally be exposed to average power densities approaching 1 mW/cm2 due to the radiation from a small-craft radar having a rotating antenna. However, should a small-craft radar be operated with the antenna rotation stopped, significantly increased levels of exposure might be encountered. Peak power density in the regions surrounding the antenna may be quite high, and possible biological hazards associated with these peak power densities are uncertain at present.

Cite This Study
D.W. Peak, D.L. Conover, W.A. Herman, R.E. Shuping (1975). Measurement of Power Density from Marine Radar.
Show BibTeX
@article{measurement_of_power_density_from_marine_radar_g4444,
  author = {D.W. Peak and D.L. Conover and W.A. Herman and R.E. Shuping},
  title = {Measurement of Power Density from Marine Radar},
  year = {1975},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

Marine radar systems operate at extremely high power levels, often generating kilowatts of electromagnetic energy. These systems can produce power densities thousands of times higher than typical consumer electronics, requiring specialized measurement techniques to assess exposure levels accurately.
Government agencies needed baseline measurements to establish safety protocols for maritime workers and nearby populations. Marine radar represents one of the most intense civilian EMF sources, making accurate power density documentation essential for developing exposure guidelines.
Marine radar systems generate vastly higher power densities than cell phones, often by factors of thousands or more. While cell phones operate at milliwatts, marine radar systems typically operate at kilowatt power levels with highly directional antennas.
Ship crew members, especially those working near radar installations, face the highest exposure levels. Port workers, maritime personnel, and people living near harbors with large radar installations also experience elevated exposure compared to general population levels.
Measuring marine radar requires specialized high-power density meters and careful positioning due to the rotating, directional nature of radar beams. Standard EMF meters designed for consumer electronics are inadequate for these intense electromagnetic fields.