Pacific Marine Radar Sea Scatter Experimental Results

Results are presented for a low grazing angle marine radar sea scatter experiment conducted in the Pacific Ocean. A wide range of wind speeds and directions resulted in non-equilibrium sea conditions, in contrast to a previous Atlantic experiment in which ocean waves were fully developed. Statistica...

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Bibliographic Details
Main Author: Trizna, Dennis B.
Other Authors: NAVAL RESEARCH LAB WASHINGTON DC
Format: Text
Language:English
Published: 1989
Subjects:
Meteorology
Physical and Dynamic Oceanography
Active & Passive Radar Detection & Equipment
Radiofrequency Wave Propagation
*SCATTERING
*RADAR SIGNALS
*SPECTRAL ENERGY DISTRIBUTION
*WIND VELOCITY
*CROSS SECTIONS
*ECHOES
*SURFACES
*MODELS
*OCEAN WAVES
RANGE(EXTREMES)
RATIOS
CYLINDRICAL BODIES
SEA STATES
NORTH ATLANTIC OCEAN
NONEQUILIBRIUM FLOW
STATISTICAL DISTRIBUTIONS
PLUMES
COMPOSITE STRUCTURES
TURBULENCE
STATISTICS
DISTRIBUTION
BRAGG ANGLE
X BAND
WEIBULL DENSITY FUNCTIONS
S BAND
PACIFIC OCEAN
Pacific
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/ADA211593
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA211593
Description
Summary:Results are presented for a low grazing angle marine radar sea scatter experiment conducted in the Pacific Ocean. A wide range of wind speeds and directions resulted in non-equilibrium sea conditions, in contrast to a previous Atlantic experiment in which ocean waves were fully developed. Statistical properties of the radar echoes are parameterized by a dual-Weibull model versus wind speed and differ from the North Atlantic data. A modified version of Wetzel's cylindrical plume scattering model satisfactorily describes the sea spike cross section characteristics. For the Weibull distribution representing distributed scatter, a composite scattering model produces neither the correct absolute cross section nor the correct X/S band ratio using Bragg scatter spectral densities derived from high grazing angle radar experiments. Thus, the surface turbulence from a broken crest on the front face of waves may be responsible for the scatter from area-distributed roughness.

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