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Precise Calibration of Channel Imbalance for Very High Resolution SAR With Stepped Frequency | IEEE Journals & Magazine | IEEE Xplore

Precise Calibration of Channel Imbalance for Very High Resolution SAR With Stepped Frequency


Abstract:

Synthetic aperture radar (SAR) images require a high-resolution system for accurate interpretations. This high range resolution can be achieved by stepped frequency chirp...Show More

Abstract:

Synthetic aperture radar (SAR) images require a high-resolution system for accurate interpretations. This high range resolution can be achieved by stepped frequency chirp signals. To reconstruct a wideband waveform from each subband signal, amplitude/phase/delay imbalance between the channels should be precisely compensated. In this paper, the system configuration is first presented. Further, a calibration strategy was proposed based on three calibration loops: the reference calibration, transmitting calibration, and receiving calibration loops for coarsely compensating the channel imbalance. Then, two different methods based on the cost functions were proposed to remove the residual channel imbalance. The proposed methods were validated using stepped frequency SAR data acquired by an X-band airborne SAR system with a total bandwidth of 3.6 GHz, yielding (unweighted) a 3-dB range resolution of 4 cm.
Published in: IEEE Transactions on Geoscience and Remote Sensing ( Volume: 55, Issue: 8, August 2017)
Page(s): 4252 - 4261
Date of Publication: 17 May 2017

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