Conference Paper

P-sounder: an airborne P-band ice sounding radar

Tech. Univ. of Denmark, Lyngby
DOI: 10.1109/IGARSS.2007.4423783 Conference: Geoscience and Remote Sensing Symposium, 2007. IGARSS 2007. IEEE International
Source: DBLP

ABSTRACT This paper presents the top-level design of an airborne, P-band ice sounding radar under development at the Technical University of Denmark. The ice sounder is intended to provide more information on the electromagnetic properties of the Antarctic ice sheet at P-band. A secondary objective is to test new ice sounding techniques, e.g. polarimetry, synthetic aperture processing, and coherent clutter suppression. A system analysis involving ice scattering models confirms that it is feasible to detect the bedrock through 4 km of ice and to detect deep ice layers. The ice sounder design features a digital signal generator, a microstrip antenna array, a conventional RF-architecture with a central transmitter, four receivers, and internal calibration loops. In 2008 the first data acquisition campaign will take place in Greenland.

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    ABSTRACT: This dissertation work was to examine the feasibility of InSAR through the ice sheets to create a fine resolution basal topography map and extraction of basal composition. InSAR was shown to be possible through the ice sheet, using data collected by the MCRDS radar around the NEEM drill site. Reflectivity maps were generated leading to the possibility of extracting useful basal composition data. Extraction of basal composition information was examined including estimating the roughness of basal topography and removing the effects of local slope.
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    ABSTRACT: ESA has assigned the Technical University of Denmark to develop an airborne P-band ice sounding radar demonstrator. The intention is to obtain a better understanding of the electromagnetic properties of the Antarctic ice sheet at P-band and to test novel ice sounding techniques in preparation for a potential spaceborne ice sounding radar. The airborne system is a coherent, high-resolution and fully polarimetric radar. Aperture synthesis is applied in the along track direction and an experimental surface clutter suppression technique based on a multi-aperture antenna can be applied in the across track direction. In May 2008, a proof-of-concept campaign was organized in Greenland, where data were acquired over the ice sheet. The system proved capable of detecting the bedrock under 3 km thick ice and of mapping the internal ice layers down to a depth of at least 1.3 km. In this paper, the system concept is outlined and first results are presented.
    Geoscience and Remote Sensing Symposium, 2008. IGARSS 2008. IEEE International; 08/2008
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    ABSTRACT: ESA’s P-band Ice Sounding Radar Demonstrator (POLARIS) has been developed by the DTU National Space Institute, Technical University of Denmark, and a Proof-of-Concept Campaign has been carried out over Greenland in May 2008. Using the Level 0 data pre-processed by DTU, a Synthetic Aperture Radar (SAR) processing has been performed, taking into account the refraction of the radar wave at the ice surface. The performance degradation related to the use of inaccurate processing parameters has been evaluated. In order to account for the variation of the flight speed and altitude over the ice, the data set has been divided into azimuth blocks and SAR processing has been applied by using the corresponding flight parameters. The expected azimuth resolution has been evaluated and compared with measurements on processed data. After having applied incoherent averaging by a factor of eight, an azimuth resolution of about 4 meters is achieved. Several data sets, from the four test flights and including both shallow and deep sounding data, have been examined. Thanks to the additional integration gain and the surface clutter reduction capability of synthetic aperture processing, it was possible to retrieve the bedrock topography up to 3 km depth. The reflection horizons due to ice-stratification were also detected.
    Advanced RF Sensors and Remote Sensing Instruments 2009, Noordwijk, Netherlands; 11/2009

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