Multipass SAR Processing for Ice Sheet Vertical Velocity and Tomography Measurements
Vertical velocity is the rate at which ice moves vertically within an ice sheet, usually measured in meters per year. This movement can occur due to various factors, including accumulation, ice deformation, basal sliding, and subglacial melting. The measurement of vertical velocities within the ice...
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University of Kansas
2023
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ftunivkansas:oai:kuscholarworks.ku.edu:1808/35033 2024-06-02T08:07:37+00:00 Multipass SAR Processing for Ice Sheet Vertical Velocity and Tomography Measurements Ariho, Gordon Stiles, James M Paden, John D Blunt, Shannon Allen, Christopher Arnold, Emily 2023 160 pages application/pdf https://hdl.handle.net/1808/35033 http://dissertations.umi.com/ku:18875 en eng University of Kansas http://dissertations.umi.com/ku:18875 https://hdl.handle.net/1808/35033 orcid:0009-0001-5930-5277 Copyright held by the author. Electrical engineering DInSAR Focusing Matrices Interferometry Joint Estimation Maximum Likelihood Estimation Mutlipass SAR Dissertation 2023 ftunivkansas 2024-05-07T04:00:58Z Vertical velocity is the rate at which ice moves vertically within an ice sheet, usually measured in meters per year. This movement can occur due to various factors, including accumulation, ice deformation, basal sliding, and subglacial melting. The measurement of vertical velocities within the ice sheet can assist in determining the age of the ice and assessing the rheology of the ice, thereby mitigating uncertainties due to analytical approximations in ice flow models.We apply differential interferometric synthetic aperture radar (DInSAR) techniques to data from the Multichannel Coherent Radar Depth Sounder (MCoRDS) to measure the vertical displacement of englacial layers within an ice sheet. DInSAR’s accuracy is usually on the order of a fraction of the wavelength (e.g., millimeter to centimeter precision is typical) in monitoring displacement along the radar line of sight (LOS). Ground-based Autonomous phase-sensitive Radio-Echo Sounder (ApRES) units have demonstrated the ability to precisely measure the relative vertical velocity by taking multiple measurements over time from the same location on the ice. Airborne systems can make a similar measurement but can suffer from deleterious spatial baseline effects since it is generally impossible to fly over the same stretch of ice on each pass with enough precision to ignore the spatial baseline. In this work, we compensate for spatial baseline errors using precise trajectory information and estimates of the cross-track layer slope using direction of arrival estimation. The current DInSAR algorithm is applied to airborne radar depth sounder data to produce results for flights near Summit Camp and the EGIG (Expéditions Glaciologiques Internationales au Groenland) line in Greenland. The existing approach estimates the parameters in multiple separated steps. However, each step has dependencies on all the values being estimated. To overcome this drawback, we have implemented a maximum likelihood estimator that jointly estimates the vertical velocity, the cross-track ... Doctoral or Postdoctoral Thesis Greenland Groenland Ice Sheet The University of Kansas: KU ScholarWorks Greenland Summit Camp ENVELOPE(-38.453,-38.453,72.579,72.579) |
institution |
Open Polar |
collection |
The University of Kansas: KU ScholarWorks |
op_collection_id |
ftunivkansas |
language |
English |
topic |
Electrical engineering DInSAR Focusing Matrices Interferometry Joint Estimation Maximum Likelihood Estimation Mutlipass SAR |
spellingShingle |
Electrical engineering DInSAR Focusing Matrices Interferometry Joint Estimation Maximum Likelihood Estimation Mutlipass SAR Ariho, Gordon Multipass SAR Processing for Ice Sheet Vertical Velocity and Tomography Measurements |
topic_facet |
Electrical engineering DInSAR Focusing Matrices Interferometry Joint Estimation Maximum Likelihood Estimation Mutlipass SAR |
description |
Vertical velocity is the rate at which ice moves vertically within an ice sheet, usually measured in meters per year. This movement can occur due to various factors, including accumulation, ice deformation, basal sliding, and subglacial melting. The measurement of vertical velocities within the ice sheet can assist in determining the age of the ice and assessing the rheology of the ice, thereby mitigating uncertainties due to analytical approximations in ice flow models.We apply differential interferometric synthetic aperture radar (DInSAR) techniques to data from the Multichannel Coherent Radar Depth Sounder (MCoRDS) to measure the vertical displacement of englacial layers within an ice sheet. DInSAR’s accuracy is usually on the order of a fraction of the wavelength (e.g., millimeter to centimeter precision is typical) in monitoring displacement along the radar line of sight (LOS). Ground-based Autonomous phase-sensitive Radio-Echo Sounder (ApRES) units have demonstrated the ability to precisely measure the relative vertical velocity by taking multiple measurements over time from the same location on the ice. Airborne systems can make a similar measurement but can suffer from deleterious spatial baseline effects since it is generally impossible to fly over the same stretch of ice on each pass with enough precision to ignore the spatial baseline. In this work, we compensate for spatial baseline errors using precise trajectory information and estimates of the cross-track layer slope using direction of arrival estimation. The current DInSAR algorithm is applied to airborne radar depth sounder data to produce results for flights near Summit Camp and the EGIG (Expéditions Glaciologiques Internationales au Groenland) line in Greenland. The existing approach estimates the parameters in multiple separated steps. However, each step has dependencies on all the values being estimated. To overcome this drawback, we have implemented a maximum likelihood estimator that jointly estimates the vertical velocity, the cross-track ... |
author2 |
Stiles, James M Paden, John D Blunt, Shannon Allen, Christopher Arnold, Emily |
format |
Doctoral or Postdoctoral Thesis |
author |
Ariho, Gordon |
author_facet |
Ariho, Gordon |
author_sort |
Ariho, Gordon |
title |
Multipass SAR Processing for Ice Sheet Vertical Velocity and Tomography Measurements |
title_short |
Multipass SAR Processing for Ice Sheet Vertical Velocity and Tomography Measurements |
title_full |
Multipass SAR Processing for Ice Sheet Vertical Velocity and Tomography Measurements |
title_fullStr |
Multipass SAR Processing for Ice Sheet Vertical Velocity and Tomography Measurements |
title_full_unstemmed |
Multipass SAR Processing for Ice Sheet Vertical Velocity and Tomography Measurements |
title_sort |
multipass sar processing for ice sheet vertical velocity and tomography measurements |
publisher |
University of Kansas |
publishDate |
2023 |
url |
https://hdl.handle.net/1808/35033 http://dissertations.umi.com/ku:18875 |
long_lat |
ENVELOPE(-38.453,-38.453,72.579,72.579) |
geographic |
Greenland Summit Camp |
geographic_facet |
Greenland Summit Camp |
genre |
Greenland Groenland Ice Sheet |
genre_facet |
Greenland Groenland Ice Sheet |
op_relation |
http://dissertations.umi.com/ku:18875 https://hdl.handle.net/1808/35033 orcid:0009-0001-5930-5277 |
op_rights |
Copyright held by the author. |
_version_ |
1800752723162824704 |