ISAR imaging of an aircraft target USING ISDB-T digital TV based passive bistatic radar

Abstract

Passive bistatic radars (PBRs) exploit existing transmitters such as TV broadcasts as the source of illumination. PBR is consisted of two receivers, with one antenna pointed at the source and the other at the target, and the target range is determined by correlating the signal scattered by the target with the signal directly arrived at the receiver. Since PBR does not transmit any waveform, it consumes lower power, and no frequency allocation is required.We have conducted a field experiment exploiting terrestrial digital TV broadcast to assess the feasibility of ISAR (Inverse Synthetic Aperture Radar) observation based on PBR. The wide and flat spectrum of the OFDM signal and the small gap between the channels enables us to obtain high range resolution of up to several meters by exploiting multiple physical channels. Therefore, moderate resolution ISAR imaging is expected to be possible. In this paper, PBR based ISAR algorithm is briefly explained, and the first example of observed PBR based ISAR image of an aircraft target is shown.

Compressive sensing–based algorithm for passive bistatic ISAR with DVB-T signals

“…If we look at the signal model for passive ISAR given in (13), this can be reformulated in a matrix form as follows:…”

“…SVA-based techniques are not effective in these cases. Other attempts have been made in [13,14] to form passive ISAR images using ISDB-T signals and looking at aircraft as targets. Nonetheless, in those cases, the channels were adjacent and the grating lobes issue caused by the bandwidth gaps was not addressed by authors.…”

Wideband DTV passive ISAR system design

“…Experimental passive ISAR studies have only considered a single physical transmit site, usually with multiple adjacent frequency channels [2]- [5]. Although this situation arises rather frequently in Europe, due to the single frequency network scheme of DVB-T, multiple adjacent frequency channels on a single common transmitter mast are very rare in the American regions.…”

Subcarrier‐based tomographic imaging for single‐frequency network passive radar with orthogonal frequency‐division multiplexing waveform

“…Experimental results of a civilian aircraft and a ship based on multiple‐channel digital television broadcasting (DVB‐T) signals prove the correctness of the theoretical framework. It is shown in [8, 9] that a moderate resolution ISAR image of an aircraft can be obtained using terrestrial digital TV broadcast based passive bistatic radar. In [10] a complete ISAR processing scheme is introduced for WiFi‐based passive radar to achieve high‐resolution cross‐range profiles of moving targets.…”