Inverse Synthetic Aperture Radar Imaging With MATLAB Algorithms, 2nd Edition

9Bistatic ISAR Imaging

While the monostatic configuration (that is both the transmitter and the receiver are collocated) is generally the standard approach for ISAR imaging applications, the use of bistatic ISAR (Bi‐ISAR) configuration at which the transmitter and the receiver are located at different locations has been gaining more attention in regard to target recognition and classification applications (Zhu et al. 2005). The use of bistatic configuration can be attractive for many situations or practices: At the top of the list, a most likely case is when the target is moving along or near to radar line‐of‐sight (RLOS) direction so that the required angular look‐angle width for resolving cross‐range points cannot be achieved (Zhu et al. 2005; Özdemir et al. 2009). The use of Bi‐ISAR imaging will solve this problem since the angular variation is assuredly obtained at the receiver site for practical usages of transmitter and receiver locations (Bhalla and Ling 1993; Ziyue et al. 2009; Drozdowicz et al. 2017). Importantly, Bi‐ISAR imaging concept has the ability to be used in early warning systems and also for the detection of intrusions along maritime borders (Lazarov et al. 2014; Wang et al. 2015). The advantages of Bi‐ISAR imaging in more detail will be explained next.

9.1 Why Bi‐ISAR Imaging?

As given in Chapter 4, the monostatic ISAR image which can be regarded as the 2D projection of target reflectivities on the projection plane of range and cross‐range domains, the ...