Contents 1. INTRODUCTION
The basic idea of passive bistatic radar (PBR) is one of measuring radar returns from targets that have been illuminated by non cooperative transmitters. Illuminations can be provided by completely unrelated radio systems and so radar observations can be clandestine. The notion of using transmitters of opportunity has been around for some time (see [1] to [8]). In particular, passive radar based on commercial broadcasts is well developed in the form of Silent Senty [2]. A large number of papers have been written on the subject and the reader should consult Griffiths [1] for a summary of the relevant literature. What has changed in recent years is the nature of the available illuminators. In particular, the move towards digital commercial broadcasting has provided a unique opportunity for PBR sine the pseudo random nature of the digital modulation can give an almost ideal radar ambiguity function. Poullin [8] has considered the use of digital broadcasts for PBR, but his results are inconclusive. We show, in this paper, that digital broadcasts can be used for the basis of a successful PBR.
