Measurement and Interpretation of North Atlantic Ocean Marine Radar Sea Scatter
Results are presented for experiments conducted with a noncoherent, high-resolution marine navigation radar aboard the NOAA ship Researcher in the North Atlantic Ocean. High-resolution radar backscatter data were collected under wind-wave equilibrium conditions, i.e., both fetch and time requirement...
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ftdtic:ADA196239 2023-05-15T17:29:13+02:00 Measurement and Interpretation of North Atlantic Ocean Marine Radar Sea Scatter Trizna, Dennis B. NAVAL RESEARCH LAB WASHINGTON DC 1988-05-31 text/html http://www.dtic.mil/docs/citations/ADA196239 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA196239 en eng http://www.dtic.mil/docs/citations/ADA196239 Approved for public release; distribution is unlimited. DTIC AND NTIS Active & Passive Radar Detection & Equipment *RADAR *RADAR CROSS SECTIONS *RADAR REFLECTIONS REQUIREMENTS ANGLES SCATTERING WEIBULL DENSITY FUNCTIONS OCEAN SURFACE BACKSCATTERING TIME DEPRESSION ANGLES BRAGG ANGLE WAVES LOW STRENGTH NORTH ATLANTIC OCEAN SEA WATER SURFACE TEMPERATURE WIND VELOCITY MARINE TRANSPORTATION GRAZING LOW ANGLES NAVIGATION HIGH RESOLUTION MODELS DISTRIBUTION AIR WIND EQUILIBRIUM(GENERAL) PE61153N WUDN280045 Text 1988 ftdtic 2016-02-22T12:22:38Z Results are presented for experiments conducted with a noncoherent, high-resolution marine navigation radar aboard the NOAA ship Researcher in the North Atlantic Ocean. High-resolution radar backscatter data were collected under wind-wave equilibrium conditions, i.e., both fetch and time requirements for fully developed seas were satisfied for the wind speeds reported. Cumulative distributions of normalized radar cross section (NRCS) of the sea surface are calculated and found to follow two Weibull distributions. Based on their characteristics, the distributions may be ascribed to two different scattering mechanisms: one due to scatterers evenly distributed over the surface, such as Bragg scatter; one due to localized scattering features, such as wave crests. The percentage occurrence of the localized scattering events (often called sea spikes) behaves with wind speed in a manner much like that found for whitecaps. Other characteristics of the two distributions also appear to correlate with wind speed, with a weak dependence on air-sea surface temperature difference. For very low grazing angles, many of these characteristics vary sharply near the 2 deg. depression angle, which is a critical angle in several scattering models. An additional scattering model is proposed here to explain this behavior. Text North Atlantic Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Active & Passive Radar Detection & Equipment *RADAR *RADAR CROSS SECTIONS *RADAR REFLECTIONS REQUIREMENTS ANGLES SCATTERING WEIBULL DENSITY FUNCTIONS OCEAN SURFACE BACKSCATTERING TIME DEPRESSION ANGLES BRAGG ANGLE WAVES LOW STRENGTH NORTH ATLANTIC OCEAN SEA WATER SURFACE TEMPERATURE WIND VELOCITY MARINE TRANSPORTATION GRAZING LOW ANGLES NAVIGATION HIGH RESOLUTION MODELS DISTRIBUTION AIR WIND EQUILIBRIUM(GENERAL) PE61153N WUDN280045 |
spellingShingle |
Active & Passive Radar Detection & Equipment *RADAR *RADAR CROSS SECTIONS *RADAR REFLECTIONS REQUIREMENTS ANGLES SCATTERING WEIBULL DENSITY FUNCTIONS OCEAN SURFACE BACKSCATTERING TIME DEPRESSION ANGLES BRAGG ANGLE WAVES LOW STRENGTH NORTH ATLANTIC OCEAN SEA WATER SURFACE TEMPERATURE WIND VELOCITY MARINE TRANSPORTATION GRAZING LOW ANGLES NAVIGATION HIGH RESOLUTION MODELS DISTRIBUTION AIR WIND EQUILIBRIUM(GENERAL) PE61153N WUDN280045 Trizna, Dennis B. Measurement and Interpretation of North Atlantic Ocean Marine Radar Sea Scatter |
topic_facet |
Active & Passive Radar Detection & Equipment *RADAR *RADAR CROSS SECTIONS *RADAR REFLECTIONS REQUIREMENTS ANGLES SCATTERING WEIBULL DENSITY FUNCTIONS OCEAN SURFACE BACKSCATTERING TIME DEPRESSION ANGLES BRAGG ANGLE WAVES LOW STRENGTH NORTH ATLANTIC OCEAN SEA WATER SURFACE TEMPERATURE WIND VELOCITY MARINE TRANSPORTATION GRAZING LOW ANGLES NAVIGATION HIGH RESOLUTION MODELS DISTRIBUTION AIR WIND EQUILIBRIUM(GENERAL) PE61153N WUDN280045 |
description |
Results are presented for experiments conducted with a noncoherent, high-resolution marine navigation radar aboard the NOAA ship Researcher in the North Atlantic Ocean. High-resolution radar backscatter data were collected under wind-wave equilibrium conditions, i.e., both fetch and time requirements for fully developed seas were satisfied for the wind speeds reported. Cumulative distributions of normalized radar cross section (NRCS) of the sea surface are calculated and found to follow two Weibull distributions. Based on their characteristics, the distributions may be ascribed to two different scattering mechanisms: one due to scatterers evenly distributed over the surface, such as Bragg scatter; one due to localized scattering features, such as wave crests. The percentage occurrence of the localized scattering events (often called sea spikes) behaves with wind speed in a manner much like that found for whitecaps. Other characteristics of the two distributions also appear to correlate with wind speed, with a weak dependence on air-sea surface temperature difference. For very low grazing angles, many of these characteristics vary sharply near the 2 deg. depression angle, which is a critical angle in several scattering models. An additional scattering model is proposed here to explain this behavior. |
author2 |
NAVAL RESEARCH LAB WASHINGTON DC |
format |
Text |
author |
Trizna, Dennis B. |
author_facet |
Trizna, Dennis B. |
author_sort |
Trizna, Dennis B. |
title |
Measurement and Interpretation of North Atlantic Ocean Marine Radar Sea Scatter |
title_short |
Measurement and Interpretation of North Atlantic Ocean Marine Radar Sea Scatter |
title_full |
Measurement and Interpretation of North Atlantic Ocean Marine Radar Sea Scatter |
title_fullStr |
Measurement and Interpretation of North Atlantic Ocean Marine Radar Sea Scatter |
title_full_unstemmed |
Measurement and Interpretation of North Atlantic Ocean Marine Radar Sea Scatter |
title_sort |
measurement and interpretation of north atlantic ocean marine radar sea scatter |
publishDate |
1988 |
url |
http://www.dtic.mil/docs/citations/ADA196239 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA196239 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA196239 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766122873798262784 |