Bistatic Synthetic Aperture Radar Imaging for Arbitrary Flight Trajectories

Abstract

Abstract-In this paper, we present an analytic, filtered backprojection (FBP) type inversion method for bistatic synthetic aperture radar (BISAR). We consider a BISAR system where a scene of interest is illuminated by electromagnetic waves that are transmitted, at known times, from positions along an arbitrary, but known, flight trajectory and the scattered waves are measured from positions along a different flight trajectory which is also arbitrary, but known. We assume a single-scattering model for the radar data, and we assume that the ground topography is known but not necessarily flat. We use microlocal analysis to develop the FBP-type reconstruction method. We analyze the computational complexity of the numerical implementation of the method and present numerical simulations to demonstrate its performance.

Bistatic Synthetic Aperture Hitchhiker Imaging

“…We compared our method to the method introduced in [17] and demonstrated its performance in numerical simulations. Further properties and advantages of the presented method will be reported in our future research.…”

“…For monostatic SAR and BISAR, the general strategy for estimating G is to perform matched ltering followed by FBP (MF-FBP) [12,8,17]. In this paper we will take an alternative approach to MF-FBP: instead, we form our images by the method described above, namely correlation followed by FBP.…”

“…χ Ω M z is a smooth cut-off function equal to one in most of the interior of Ω M z and zero in the exterior of Ω M z , and η M is the determinant of the Jacobian that comes from the change of variables [17] …”

“…Thus, we perform reconstruction in three steps: First correlate the received signals; next lter the correlated signal; and nally backproject the correlated and ltered signals along the intersection of the illuminated surface and the hyperboloid H 12 de ned in Section 3. We compare our method to the BISAR reconstruction method introduced in [17], present the analysis of computational complexity for both methods, and compare their performances in numerical simulations.…”

Bistatic Forward-Looking Synthetic Aperture Radar Imaging Based on the Modified Loffeld's Bistatic Formula

“…However, they require a high computational cost [11] and are not available for real-time imaging application. Therefore, frequency domain algorithms are taken into account.…”