Compensation of analog imperfections In a Ka-band FMCW SAR

Emilie Avignon (1) , Weixian Liu (2) , Hongchuan Feng (2) , Sylvain Azarian (3) , Marc Lesturgie (3, 4) , Yilong Lu (2)

1 E3S - Supélec Sciences des Systèmes
2 Temasek life sciences laboratory [Singapore]
3 SONDRA - Sondra, CentraleSupélec, Université Paris-Saclay (COmUE)
4 ONERA - The French Aerospace Lab [Palaiseau]

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 up-conversion and down-conversion block. Processing of SAR data acquisition demonstrates the efficiency of the method.

Mots clés: VCO non-linearities; FMCW radar; VCO calibration

Domaines: Electronique; Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Emilie Avignon, Weixian Liu, Hongchuan Feng, Sylvain Azarian, Marc Lesturgie, et al.. Compensation of analog imperfections In a Ka-band FMCW SAR. 9th European Conference on Synthetic Aperture Radar (EUSAR 2012), Apr 2012, Nuremberg, Germany. pp.60-63. ⟨hal-00752229⟩