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


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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Available from: Viktor Krozer
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    • "In order to gain a better understanding of scattering and propagation through ice-sheets at this frequency and to validate new data processing techniques, ESA has awarded to DTU the development of an airborne demonstrator, called POLARIS (POLarimetric Airborne Radar Ice Sounder), and a Proof-of-Concept Campaign has been carried out over Greenland in May 2008. Both engineering and science data have been delivered to ESA [1] [2] [3] [4] [5]. "
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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.
    Full-text · Conference Paper · Nov 2009
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    • "This paper outlines the capabilities of the ice sounder and presents first results. The subsystems have been developed [2], [3], [4] and integrated. In March 2008 the system was installed on a Twin Otter aircraft (Figure 1), certified and functionally tested in Greenland. "
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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.
    Full-text · Conference Paper · Aug 2008
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    • "II. ANTENNA DESIGN A wideband probe-fed dual-linear polarisation wideband microstrip patch antenna array has been developed for the Psounder . The microstrip patch antenna has been extensively employed in EMISAR L-band synthetic aperture radar (SAR) with very good performance [1],[4],[5], however at a reduced relative bandwidth. An improved bandwidth of this antenna has been presented in [5] with very good return loss. "
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    ABSTRACT: This paper describes the design of an airborne P-band ice sounding radar. The ice sounder design features a microstrip antenna array with a relative operating bandwidth of 20%, compact RF components, a high efficiency high-power LDMOS power amplifier with >60% power-added efficiency across a relative bandwidth of 20% at a center frequency of 435 MHz, and a digital signal generation and acquisition unit. Furthermore, we demonstrate broadband performance of our left-handed/right-handed out-of-phase power dividers. In 2008 the first data acquisition campaign will take place in Greenland.
    Full-text · Conference Paper · Nov 2007
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