[논문]Low-Frequency SAR Radiometric Calibration and Antenna Pattern Estimation by Using Stable Point Targets

Guccione, Pietro; Scagliola, Michele; Giudici, Davide

doi:10.1109/TGRS.2017.2752228

Low-Frequency SAR Radiometric Calibration and Antenna Pattern Estimation by Using Stable Point Targets

IEEE transactions on geoscience and remote sensing : a publication of the IEEE Geoscience and Remote Sensing Society, v.56 no.2, 2018년, pp.635 - 646

Guccione, Pietro (Dipartimento di Ingegneria Elettrica e Informazione, Politecnico di Bari, Bari, Italy) , Scagliola, Michele (Aresys s.r.l., Milan, Italy) , Giudici, Davide (Aresys s.r.l., Milan, Italy)

Abstract ▼ AI-Helper

In this paper, the synthetic aperture radar (SAR) calibration for low-frequency missions by means of stable point targets is presented. Calibration at low frequency involves the absolute radiometric calibration, the antenna pattern and pointing characterization and validation, and the distortion system parameters’ estimation. The use of traditional instrumentation, such as a polarimetric active radar calibrator, a corner reflector, or an active transponder, may be costly and can reduce the time the instrument is used for operational acquisitions. The purpose of this paper is to evaluate the potentiality in calibration of point targets for which the radar cross section and the time stability have been characterized. Given a calibration site, once that a set of the stable point targets have been detected by the analysis of an interferometric stack of SAR acquisitions, they may be used as passive calibrators for the validation of radiometry, elevation antenna pattern, and pointing estimation. We show that, although less targets are expected to be found in P- or L- band than in C- or X-band, a sufficient amount (about 250 targets per acquisition) can provide an accuracy in antenna pattern estimation of about 0.04 dB, if the target accuracy is 0.1 dB at $1\sigma$.

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Low-Frequency SAR Radiometric Calibration and Antenna Pattern Estimation by Using Stable Point Targets

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