Compensation of Analog Imperfections In a Ka-band FMCW SAR

Konferenz: EUSAR 2012 - 9th European Conference on Synthetic Aperture Radar
23.04.2012 - 26.04.2012 in Nuremberg, Germany

Tagungsband: EUSAR 2012

Seiten: 4Sprache: EnglischTyp: PDF

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Avignon-Meseldzija, Emilie; Azarian, Sylvain; Lesturgie, Marc (Supélec, France)
Liu, Weixian; Feng, Hongchuan; Lu, Yilong (Temasek Laboratories, Nanyang Technological University, Singapore)

This paper deals with the compensation of analog imperfections in a Ka-Band FMCW SAR. Due to the presence of phase distortion in the up-conversion and down-conversion block, we demonstrate that the calibration of the VCO based on a reference beat signal is range-limited. We propose a post-processing method to compensate the residual sinusoidal nonlinearities of the VCO characteristic as well as the phase distortion coming from the upconversion and down-conversion block. Processing of SAR data acquisition demonstrates the efficiency of the method.