This chapter presents the application of the PB-ISAR (passive bistatic-ISAR) technique to data collected in a harbor area. The results show the effectiveness of PB-ISAR algorithm for the purposes of harbor protection and surveillance. In Chapter 5, the theory behind PB-ISAR imaging has been detailed. The PB-ISAR algorithm is based on two main concepts. The first concerns the bistatic ISAR theory. Owing to the fact that a passive radar is intrinsically bistatic, since the transmitter and the receiver are not co-located, the bistatic ISAR theory can be applied [4].