Efficient ω-<i>k</i>-algorithm for circular SAR and cylindrical reconstruction areas

Abstract

Abstract. We present a novel reconstruction algorithm of ω-k type which suits for wideband circular synthetic aperture data taken in stripmap mode. The proposed algorithm allows to reconstruct an image on a cylindrical surface. The range trajectory is approximated by Taylor Series expansion using only the quadratic terms which limits the angular reconstruction range (cross range). In our case this is not a restriction for the application. Wider areas with respect to cross range can be realized by joining several reconstructed images side by side to build a wider image by means of digital spotlighting.

Three-Dimensional Microwave Holographic Imaging Employing Forward-Scattered Waves Only

“…Resampling of the data in -space is also necessary. Also, in [16][17][18], similar 3D holographic imaging techniques have been proposed where the wideband data is acquired on a cylindrical aperture to extend the "view angles" for the object. This leads to better imaging results.…”

High resolution SAR imaging along circular trajectories

“…Due to their wide Doppler range, flashlook images are more efficiently computed using fast (or semifast) factorized back projection algorithms [4]. There exist frequency domain image synthesis techniques for circular SAR [5] using the full circular aperture, but they are designed for imaging of a human body "surface" (i.e. mapped on a vertical cylindrical surface) from a short range radar rotating below the floor (for airport safety applications).…”

Coherent millimeter-wave imaging for security applications

“…Due to the angular approximation in (3) the validity of the algorithm is limited with respect to the maximum angular extent L ϕa , which can be processed with acceptable image quality. Since targets usually can be seen over a limited angular extend only, this is not a severe restriction [10].…”