A Semianalytical Model of the Synthetic Aperture, Interferometric Radar Altimeter Mean Echo, and Echo Cross-Product and Its Statistical Fluctuations
| Autor: | Walter H. F. Smith, Robert Cullen, Natalia Galin, K. A. Giles, Thomas W. K. Armitage, Duncan J. Wingham |
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| Rok vydání: | 2018 |
| Předmět: |
Synthetic aperture radar
010504 meteorology & atmospheric sciences Echo (computing) Astrophysics::Instrumentation and Methods for Astrophysics 0211 other engineering and technologies 02 engineering and technology Statistical fluctuations 01 natural sciences law.invention Interferometry Radar altimeter law Range (statistics) General Earth and Planetary Sciences Satellite Altimeter Electrical and Electronic Engineering Physics::Atmospheric and Oceanic Physics Geology 021101 geological & geomatics engineering 0105 earth and related environmental sciences Remote sensing |
| Zdroj: | IEEE Transactions on Geoscience and Remote Sensing. 56:2539-2553 |
| ISSN: | 1558-0644 0196-2892 |
| DOI: | 10.1109/tgrs.2017.2756854 |
| Popis: | This paper develops a model of the synthetic aperture, interferometric satellite radar altimeter echo power, and echo cross-product. The model uses the smallness of the satellite pitch and roll angles, and the limited range of satellite altitude to provide a semianalytical echo model, whose numerical dimensions are limited to two in the synthetic aperture case or three in the interferometric case at large roll angles, making its application to extensive data practical. By not implementing the synthetic beam formation, it is demonstrated that the model recovers the conventional case of a pulse-limited altimeter. A theoretical description of the fluctuations in the multilooked, interferometric cross-product, and the synthetic aperture and pulse-limited powers is given by extending the model to describe correlations between individual looks in each case. The model offers the potential to retrieve ocean-surface parameters from synthetic aperture and pulse-limited altimeter data simultaneously, with obvious application to the new generation of altimeters onboard CryoSat-2, Sentinel-3, and Sentinel-6 during the transition to operational synthetic aperture radar altimetry. |
| Databáze: | OpenAIRE |
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