Measurement of Power Density from Marine Radar
D.W. Peak, D.L. Conover, W.A. Herman, R.E. Shuping · 1975
Early government research measured marine radar power density levels, establishing baseline data for maritime EMF exposures.
Plain English Summary
This 1975 government study measured the power density levels emitted by marine radar systems used on ships and boats. The research provided technical data on radar exposure levels that workers and vessel occupants might encounter during normal operations. This early work helped establish baseline measurements for understanding potential EMF exposure from maritime radar equipment.
Why This Matters
This government research from 1975 represents an important early effort to quantify EMF exposures from marine radar systems. While we don't have the specific findings, this type of measurement work was crucial for understanding occupational exposures in maritime environments. Marine radar operates at much higher power levels than consumer electronics, typically in the gigahertz frequency range with focused beam patterns that can create significant localized exposures.
What makes marine radar particularly relevant today is that these systems continue operating essentially unchanged while we've added layers of wireless technology to ships and boats. Coast Guard personnel, commercial fishermen, and recreational boaters may face combined exposures from radar, GPS, satellite communications, and personal devices. The reality is that maritime workers often spend hours near these high-powered systems with little awareness of cumulative EMF exposure levels.
Exposure Information
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 also clear, however, that significant variations from the computed values may occur. Personnel would normally not 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. Any possible biological hazards associated with these peak power densities are uncertain at present. Moreover, the possibility of interference phenomena in critical devices (such as cardiac pacemakers) due to high peak power densities seems to warrant caution and further research.
Show BibTeX
@article{measurement_of_power_density_from_marine_radar_g6364,
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},
}