Fast Isar Image Simulation of Targets at Arbitrary Aspect Angles Using a Novel Sbr Method

We present an efficient way to generate the inverse synthetic aperture radar (ISAR) image of a target at an arbitrary aspect angle using the shooting and bouncing ray (SBR) method, which is much faster than the conventional approach by inverse Fourier transforming the computed scattered fields over frequency and aspect domain. We propose a general image-domain ray-tube integration formula, which contains aspect-dependent factors. The new formula can provide ISAR images of a target rapidly and conveniently in different image planes at different aspect angles in a world coordinate system. The ISAR images of a cube and an aircraft for several aspect angles and different image planes are presented to demonstrate the efficiency and accuracy of the general formula. The proposed method is more significant when large amount of ISAR images of a target are required to build the database for target recognition.