Accurate Estimate of the Azimuth Antenna Pattern from SAR Images

Konferenz: EUSAR 2006 - 6th European Conference on Synthetic Aperture Radar
16.05.2006 - 18.05.2006 in Dresden, Germany

Tagungsband: EUSAR 2006

Seiten: 4Sprache: EnglischTyp: PDF

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Guarnieri, A. Monti (Dipartimento di Elettronica e Informazione - Politecnico di Milano, Leonardo Da Vinci, 32 - 20133 Milano - Italy)
Giudici, D. (ARESYS - A PoliMi Spin-Off, Via Garofalo, 39 - 20133 Milano - Italy)

In this paper we present a novel technique to obtain an accurate estimation of the Azimuth Antenna Pattern (AAP) over a very wide angle (several footprints), by making use of the point scatterers available in SAR images. The technique selects those targets which are less affected by alias and have an isotropic radiation pattern. The targets’ responses are processed over a wide Doppler Band (3 to 5 times the PRF) with a SPOTLIGHT technique and the unfolded spectra are averaged using a frequency varying weighting. The averaging can be incoherent or coherent. In the latter case a fine phase alignment is performed before spectra averaging. Results achieved by use of ENVISAT-ASAR images are shown.