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Maritime radar

Belongs to:
Radar system
Synonyms:
Marine radar
Description:

Maritime radar is used to survey shipping on waterways. In the simplest case, a primary radar system is used, emitting electromagnetic waves which are reflected at the walls of a ship. Employed frequencies range between 1 GHz - 2 GHz in the L-band, between 2 GHz - 4 GHz in the S-band and between 8 GHz - 12 GHZ in the X-band.

Frequency ranges:
  • 1.55–1.65 GHz (within the L band)
  • 3.02–3.1 GHz (within the S band)
  • 3.1–9.45 GHz (within the S- and X band)
Type of field:
electromagnetic

Measurements (acc. to literature)

civil application
Measurand Value Feature Remarks
power density 3.07 W/m² (maximum) - at the working place of the marine radar operator [1]
power density 10 W/m² (maximum) - at a distance of 100 m [2]
power density 59 mW/m² (mean, measured) - radar system: Decca RM-316 [3]
power density 61 mW/m² (mean, measured) - radar system: Konel KRA-221 [3]
power density 70 mW/m² (mean, measured) - radar system: Decca Super 101 [3]
SAR 0.679 mW/kg (maximum) - at the working place of the marine radar operator [1]
military application
Measurand Value Feature Remarks
electric field strength 15 V/m (maximum) - at a transmission power of 125 W at the Upper Bridge on a Fast Patrol Boat [4]
electric field strength 168 V/m (maximum) - at a transmission power of 125 W on the afterdeck [4]
electric field strength 297 V/m (maximum) - at a transmission power of 125 W in the captain's cabin of a Fast Patrol Boat [4]
magnetic field strength 0.043 A/m (maximum) - at a transmission power of 125 W at the Upper Bridge on a Fast Patrol Boat [4]
power density 2.4 mW/m² (maximum) - weapon control radar at 9.1 GHz on a Fast Patrol Boat at the Upper Bridge [4]
power density 16 mW/m² (maximum) - navigation radar at 9.4 GHz on a Fast Patrol Boat at the Upper Bridge [4]
power density 3.07 W/m² (maximum) - at the working place of the marine radar operator [1]
SAR 0.679 mW/kg (maximum) - at the working place of the marine radar operator [1]

References

  1. Garaj-Vrhovac V et al. (2011): Assessment of cytogenetic damage and oxidative stress in personnel occupationally exposed to the pulsed microwave radiation of marine radar equipment.
  2. Jokela K et al. (1999): Occupational RF Exposures.
  3. Allen SG et al. (1994): Review of Occupational Exposure to Optical Radiation and Electric and Magnetic Fields with Regard to the Proposed CEC Physical Agents Directive. NRPB·R265
  4. Baste V et al. (2010): Radiofrequency exposure on fast patrol boats in the Royal Norwegian Navy-an approach to a dose assessment.