Wavefront Reconstruction of Elevation Circular Synthetic Aperture Radar Imagery Using a Cylindrical Green's Function
1 Division of Medical Physics, CancerCare Manitoba, Winnipeg, MB, Canada, R3E 0V9
2 Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, MB, Canada, R3T 5V6
3 Department of Radiology, University of Manitoba, Winnipeg, MB, Canada, R3E 3P5
4 Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, Canada, R3T 2N2
EURASIP Journal on Advances in Signal Processing 2010, 2010:657323 doi:10.1155/2010/657323Published: 15 December 2009
Elevation Circular Synthetic Aperture Radar (E-CSAR) is a novel radar modality used to form radar images from data sets acquired along a complete or even a segment of a cylindrical geometry above a given scan area. Due to the nonlinear nature of the target signatures on the E-CSAR data sets, the collected data must be focused. In this paper, a novel E-CSAR reconstruction algorithm is proposed. The proposed method uses a new formulation of the Green's function of an E-CSAR scan geometry in which the phase components introduced by the scan geometry can be clearly identified and their effects can be effectively compensated. Additionally, theoretical aspects of the point spread function related to this new Green's function were determined. The feasibility of the proposed technique was assessed using experimental data sets. The proposed method yielded spatially accurate images and exhibited an average execution time in the order of minutes.