Airborne synthetic aperture radar ice-sounding depth profiles from Recovery Ice Stream 2016/17, and calibration data from Rothera 2016/17 and 2019/20

This data set corresponds to the processing of data acquired by the British Antarctic Survey (BAS) airborne Synthetic Aperture Radar (SAR) PASIN2 (Polarimetric Airborne Scientific INstrument, mark 2), designed for deep ice sounding and basal 3D-mapping. The dataset includes the processed calibration data collected over the sea surface near Rothera Research Station during the Antarctic Summers campaigns in 2016/17 FISS (Filchner Ice Shelf System) and 2019/20 BEAMISH (Bed Access, Monitoring and Ice Sheet History) projects, and the processed SAR images as depth profiles in the Recovery Ice Stream near its grounding line, in 2016/17 (FISS). With multiple antennas for transmission and reception at 150-MHz central frequency, and an across-track physical array, PASIN2 resolves the ambiguities for distinguishing between scatterers from port and starboard directions. After processing several 2D SAR images (range and along-track dimensions) with transmitter-receiver pairs, the directional ambiguities are resolved, obtaining the across-track Direction of Arrival (DoA, elevation angle) estimation. Finally, from the 3D geometry of range, along-track and across-track angle, the real depths and across-track distances are estimated, regarding the case of the incorrectly assumed vertical DoA of a single SAR image. The calibration flights assessed and validated the instrument antenna patterns and processing performances. In this dataset, only the simulated and measured antenna patterns, and SAR and DoA images are included. By resolving directional ambiguities and accounting for reflector across-track location, the true ice thickness and bed elevation are obtained, thereby removing the error of the usual assumption of vertical DoA, that greatly influence the output of flow models of ice dynamics.





This work was supported by NERC grant reference NE/L013444/1.

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Date (Creation)
2023-01-18
Date (Revision)
2023-01-18
Date (Publication)
2023-01-18
Date (released)
2023-01-18
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1.0
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https://doi.org/10.5285/faac4156-047d-47ba-9e31-1a4f766bfdf8
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GB/NERC/BAS/PDC/01708
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https://data.bas.ac.uk/

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NE/L013444/1
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Please cite this item as: Arenas Pingarron, A., Corr, H., Jordan, T., Robinson, C., Nicholls, K., & Smith, A. (2023). Airborne synthetic aperture radar ice-sounding depth profiles from Recovery Ice Stream 2016/17, and calibration data from Rothera 2016/17 and 2019/20 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/faac4156-047d-47ba-9e31-1a4f766bfdf8

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Organisation name Individual name Electronic mail address Role
British Antarctic Survey Arenas Pingarron, Alvaro Author
British Antarctic Survey

Corr, Hugh

 		Author
British Antarctic Survey Jordan, Tom Author
British Antarctic Survey Robinson, Carl Author
British Antarctic Survey Nicholls, Keith Author
British Antarctic Survey Smith, Andrew Author
NERC EDS UK Polar Data Centre

PDCServiceDesk@bas.ac.uk

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As needed
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Completed
Global Change Master Directory (GCMD) Science Keywords
Theme

  • Antarctica

  • Recovery Ice Stream

  • aerogeophysics

  • ice thickness

  • synthetic aperture radar
Place

  • Filchner Ice Shelf, Recovery Glacier Antarctica

  • Adelaide Island, Rothera Research Station Antarctica

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Data supplied under Open Government Licence v3.0
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Topic category
  • Elevation
  • Geoscientific information
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Begin date
2016-12-21
End date
2017-01-23

Vertical extent

Minimum value
392.2291
Maximum value
846.4242

Vertical CS

No information provided.

Vertical datum

No information provided.
Supplemental Information

It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.

Title

European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
Date (Publication)
2008-11-12
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European Petroleum Survey Group

EPSGadministrator@iogp.org

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urn:ogc:def:crs:EPSG::3031
Version

6.18.3

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NERC EDS UK Polar Data Centre

PDCServiceDesk@bas.ac.uk

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Methodology:

The raw data was collected by the airborne Synthetic Aperture Radar (SAR) PASIN2. It is 150-MHz coherent pulsed radar, transmitting chirped pulses with linear frequency sweep, with 13 MHz bandwidth and effective pulse repetition frequency 125 Hz. On board of a De Havilland DHC-6 Twin Otter aircraft, in ice-sounding flights the nominal speed is 60 m/s, and the terrain clearance (height above closest surface) is 300 m. PASIN2 has 12 antenna elements: 8 underwing folded-dipoles switching between transmit (TX) and receive (RX) modes, and 4 printed-dipoles being RX-only attached to the fuselage belly. The data processing is performed off-line, consisting of: 1) channel calibration; 2) 2D SAR imaging, based on pulse-compression for range dimension, and back-projection for along-track dimension; 3) Direction of Arrival estimation (DoA) of the remaining across-track angle, based on the non-linear MUSIC (Multiple Signal Classification) algorithm, by using several SAR images from different transmitters or receivers; and 4) 3D-mapping from the three dimensions of range, along-track and across-track angle, by correcting the real depths and across-track distances, regarding the case of incorrectly assumed vertical DoA of a single SAR image. In this dataset are included: the SAR and DoA images from nominal surveying flights above the Recovery Glacier; and calibration data and the measured antenna patterns, from calibration flights above the sea surface near Rothera Research Station.

Data collection:

PASIN2 (Polarimetric Airborne Scientific INstrument, mark 2) radar; Matlab R2020b software. The parameter files used for processing, and a script for generating the plots with antenna patterns, are in the open repository https://github.com/antarctica/calibration-processing-parameters-PASIN2.git.

Data quality:

The amplitude and relative phase of the antenna patterns in transmission (as an array of 4 antennas) and reception (as 12 single and independent antennas), were assessed with calibration flights above the sea surface. The patterns are assumed as invariant along each session, if the antenna configuration remains. Direction of Arrival (DoA) estimation algorithms were evaluated with calibration flights.





The transmitted radar pulses are not calibrated, as parameter drifts are not expected to affect the quality. In the receiver units, during each flight there is a drift in the recording, causing a delay and phase drift in the sampled data, which is corrected when combining the several SAR images to process a single Direction of Arrival (DoA) image.

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English
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Dataset
Hierarchy level name

dataset
Date stamp
2023-01-18
Metadata standard name

ISO 19115 Geographic Information - Metadata
Metadata standard version

ISO 19115:2003(E)
Metadata author
Organisation name Individual name Electronic mail address Role
NERC EDS UK Polar Data Centre

polardatacentre@bas.ac.uk

Point of contact
 
 

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Spatial extent

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Keywords

Antarctica Recovery Ice Stream aerogeophysics ice thickness synthetic aperture radar
GEMET - INSPIRE themes, version 1.0

Elevation
Global Change Master Directory (GCMD) Science Keywords

EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness EARTH SCIENCE > Spectral/Engineering > Radar EARTH SCIENCE > Spectral/Engineering > Radar > Radar Imagery


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