  In this paper, we present a high resolution microwave imaging technique using
a compact and low cost single channel Frequency Modulated Continuous Wave
(FMCW) radar based on Circular Synthetic Aperture Radar (CSAR) technique. We
develop an algorithm to reconstruct the image from the raw data and analyse
different aspects of the system analytically. Furthermore, we discuss the
differences between the proposed systems in the literature and the one
presented in this work.
  Finally, we apply the proposed approach to the experimental data collected
from a single channel FMCW radar operating at $\rm 79 \;GHz$ and present the
results.
