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Evaluation of the Internal Calibration Methodologies for Spaceborne Synthetic Aperture Radars with Active Phased Array Antennas

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5 Author(s)
Makhoul, E. ; Dept. of Signal Theor. & Commun., Univ. Politec. de Catalunya, Barcelona, Spain ; Broquetas, A. ; Lopez-Dekker, F. ; Closa, J.
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This paper presents a novel approach in the instrumental error analysis of Synthetic Aperture Radars (SAR) based on active phased array antennas (APAA). A residual post-calibration error exists due to differences between the calibration and operational excitations of the transmit/receive modules (TRMs) for those source errors that are monitored by the internal calibration facility. Analytical expressions are derived for the residual post-calibration errors and validated through intensive simulations of some instrumental errors for a specific sensor architecture. Alternative internal global calibration strategies are proposed to reduce the impact of the post-calibration error. The simulations show that the proposed elevation dependent calibration can provide a substantial reduction of the post-calibration errors even in the case of relaxed tolerance of the TRM weight setting errors.

Published in:

Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of  (Volume:5 ,  Issue: 3 )

Date of Publication:

June 2012

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