Subband cross-correlation processing with interference mitigation for passive bistatic radar

In this paper, cross-correlation processing with interference mitigating ability is proposed for passive bistatic radar. Direct signal interference from an illuminator-of-opportunity and stationary clutter are simultaneously cancelled in frequency domain during FFT (Fast Fourier Transform)-based cross-correlation processing. Due to the frequency domain processing, the proposed method can extend to subband-based interference mitigation to combat with channel mismatch between the surveillance and reference channels. Computer simulation results are included to highlight performance of the proposed method under channel mismatch condition.

I. Introduction

Passive bistatic radar (PBR) attracts attention in radar community due to recent rapid growth of wideband and high-power digital broadcasts and communications. To date, various types of PBR are reported. In [1]–[3], PBR using commercial FM broadcast as an illuminator-of-opportunity are reported. Especially in [3], a long range target detection at 285 km away from a receiver is reported. Wideband terrestrial digital television broadcast, i.e. European and Australian DVB-T (Digital Video Broadcast-Terrestrial) and Japanese ISDB-T (Integrated Services Digital Broadcasting - Terrestrial), is used to improve and stabilize radar range resolution [4]–[8]. Ubiquitous WiFi signals are used in short range PBR to detect ground vehicles and human beings [9] [10].