Investigations of Freshwater and Ice Surveying Using Short-Pulse Radar
An overview is presented of recent activities and results in the use of commercially available short-pulse UHF radar for surveying ice conditions on freshwater bodies. Improvements in radar systems have made it possible to increase ice thickness resolution by as much as one third relative to that in...
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ftdtic:ADA241435 2023-05-15T16:37:21+02:00 Investigations of Freshwater and Ice Surveying Using Short-Pulse Radar O'Neill, Kevin Arcone, Steven A. COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH 1991-07 text/html http://www.dtic.mil/docs/citations/ADA241435 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA241435 en eng http://www.dtic.mil/docs/citations/ADA241435 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Active & Passive Radar Detection & Equipment Snow Ice and Permafrost AIRBORNE ALGORITHMS ANGLES APPROACH ATTENUATION BOTTOM COUPLING(INTERACTION) FREQUENCY FRESH WATER GROUND LEVEL ICE INTERFACES INTERFERENCE INVERSION LAYERS MATCHED FILTERS PARALLEL ORIENTATION PATTERNS RADAR RADAR EQUIPMENT RESOLUTION SHORT PULSES SIGNAL PROCESSING SLOPE SPECTRA SURVEYS THICKNESS THINNESS TIME DEPENDENCE ULTRAHIGH FREQUENCY WATER WEIGHT Radar pulses Search radar *Radar reflections *Signal processing *Ice Ice openings PE61102A PE62784A AST24 AST42 Text 1991 ftdtic 2016-02-19T11:32:50Z An overview is presented of recent activities and results in the use of commercially available short-pulse UHF radar for surveying ice conditions on freshwater bodies. Improvements in radar systems have made it possible to increase ice thickness resolution by as much as one third relative to that in past attempts, and some new signal processing approaches shown here may offer an order of magnitude improvement. Results from airborne surveying are shown in which the varieties of ice character are reflected. Given the lack of ground coupling, one can rely upon a reasonably well-defined wavelet structure for enhanced signal processing and interpretation possibilities. An algorithm is presented that locates returns from interfaces in the presence of noise for a non-minimum delay wavelet. The method performs a simple inversion in the frequency domain, enhanced by a time dependent weight designed to recognize the shape of the wavelet amplitude and phase spectra. Thin ice layers are resolved down to a few centimeters and are distinguished from an ice free condition by means of a matched filter system designed to recognize the interference pattern from parallel interfaces close to one another. The effects and constraints imposed by water layers on wet ice are discussed, as are general attenuation, sloping bottom, and critical angle effects in deeper water. Text Ice permafrost 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 |
op_collection_id |
ftdtic |
language |
English |
topic |
Active & Passive Radar Detection & Equipment Snow Ice and Permafrost AIRBORNE ALGORITHMS ANGLES APPROACH ATTENUATION BOTTOM COUPLING(INTERACTION) FREQUENCY FRESH WATER GROUND LEVEL ICE INTERFACES INTERFERENCE INVERSION LAYERS MATCHED FILTERS PARALLEL ORIENTATION PATTERNS RADAR RADAR EQUIPMENT RESOLUTION SHORT PULSES SIGNAL PROCESSING SLOPE SPECTRA SURVEYS THICKNESS THINNESS TIME DEPENDENCE ULTRAHIGH FREQUENCY WATER WEIGHT Radar pulses Search radar *Radar reflections *Signal processing *Ice Ice openings PE61102A PE62784A AST24 AST42 |
spellingShingle |
Active & Passive Radar Detection & Equipment Snow Ice and Permafrost AIRBORNE ALGORITHMS ANGLES APPROACH ATTENUATION BOTTOM COUPLING(INTERACTION) FREQUENCY FRESH WATER GROUND LEVEL ICE INTERFACES INTERFERENCE INVERSION LAYERS MATCHED FILTERS PARALLEL ORIENTATION PATTERNS RADAR RADAR EQUIPMENT RESOLUTION SHORT PULSES SIGNAL PROCESSING SLOPE SPECTRA SURVEYS THICKNESS THINNESS TIME DEPENDENCE ULTRAHIGH FREQUENCY WATER WEIGHT Radar pulses Search radar *Radar reflections *Signal processing *Ice Ice openings PE61102A PE62784A AST24 AST42 O'Neill, Kevin Arcone, Steven A. Investigations of Freshwater and Ice Surveying Using Short-Pulse Radar |
topic_facet |
Active & Passive Radar Detection & Equipment Snow Ice and Permafrost AIRBORNE ALGORITHMS ANGLES APPROACH ATTENUATION BOTTOM COUPLING(INTERACTION) FREQUENCY FRESH WATER GROUND LEVEL ICE INTERFACES INTERFERENCE INVERSION LAYERS MATCHED FILTERS PARALLEL ORIENTATION PATTERNS RADAR RADAR EQUIPMENT RESOLUTION SHORT PULSES SIGNAL PROCESSING SLOPE SPECTRA SURVEYS THICKNESS THINNESS TIME DEPENDENCE ULTRAHIGH FREQUENCY WATER WEIGHT Radar pulses Search radar *Radar reflections *Signal processing *Ice Ice openings PE61102A PE62784A AST24 AST42 |
description |
An overview is presented of recent activities and results in the use of commercially available short-pulse UHF radar for surveying ice conditions on freshwater bodies. Improvements in radar systems have made it possible to increase ice thickness resolution by as much as one third relative to that in past attempts, and some new signal processing approaches shown here may offer an order of magnitude improvement. Results from airborne surveying are shown in which the varieties of ice character are reflected. Given the lack of ground coupling, one can rely upon a reasonably well-defined wavelet structure for enhanced signal processing and interpretation possibilities. An algorithm is presented that locates returns from interfaces in the presence of noise for a non-minimum delay wavelet. The method performs a simple inversion in the frequency domain, enhanced by a time dependent weight designed to recognize the shape of the wavelet amplitude and phase spectra. Thin ice layers are resolved down to a few centimeters and are distinguished from an ice free condition by means of a matched filter system designed to recognize the interference pattern from parallel interfaces close to one another. The effects and constraints imposed by water layers on wet ice are discussed, as are general attenuation, sloping bottom, and critical angle effects in deeper water. |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH |
format |
Text |
author |
O'Neill, Kevin Arcone, Steven A. |
author_facet |
O'Neill, Kevin Arcone, Steven A. |
author_sort |
O'Neill, Kevin |
title |
Investigations of Freshwater and Ice Surveying Using Short-Pulse Radar |
title_short |
Investigations of Freshwater and Ice Surveying Using Short-Pulse Radar |
title_full |
Investigations of Freshwater and Ice Surveying Using Short-Pulse Radar |
title_fullStr |
Investigations of Freshwater and Ice Surveying Using Short-Pulse Radar |
title_full_unstemmed |
Investigations of Freshwater and Ice Surveying Using Short-Pulse Radar |
title_sort |
investigations of freshwater and ice surveying using short-pulse radar |
publishDate |
1991 |
url |
http://www.dtic.mil/docs/citations/ADA241435 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA241435 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA241435 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027637967290368 |