Physics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3622501h&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 22, CiteID L22501
Physics
Cryosphere: Remote Sensing, Cryosphere: Ice Sheets, Cryosphere: Instruments And Techniques, Cryosphere: Glaciology (1621, 1827, 1863)
Scientific paper
Interferometric Radar Altimeters (IRA's) use dual receive antennas to overcome one of the spatial limitations of pulse-limited altimeters. In a conventional IRA measurement, the range and across-track direction of a scatterer are determined using the phase difference between the antennas. We demonstrate a method of determining multiple elevation points across a swath orthogonal to the instrument ground track in regions of steep terrain, such as ice-sheet margins. We use data from an airborne IRA (a prototype of the CryoSat-2 instrument), and compare the results to simultaneous Airborne Laser Scanner (ALS) observations. This application results in a 75-fold increase in measurement density compared to conventional radar altimetry. Along a ˜2.5 km ground track, the RMS departure between the IRA- and ALS-derived measurements was 1.67 m. Based on our result, although our approach is limited to areas of relatively steep slope, a 25- to 75-fold increase in elevation measurements could be achieved in coastal regions of Antarctica and Greenland with similar processing of CryoSat-2 data.
Cullen Robert
Hawley Robert L.
Helm V.
Shepherd Andrew
Wingham Duncan J.
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