Reconstruction and Reciprocal Filter of OFDM Waveforms for DVB-T2 Based Passive Radar

The digital video broadcasting (DVB) transmission standard DVB-T2 published by the ETSI [1] enables a new digital television format for terrestrial transmissions. It currently supersedes DVB-T transmission systems. The introduction of a complicated frame and modulation structure raises several demands to process DVB-T2 in passive radar applications. This includes challenges for the reconstruction and the processing due to different symbol lengths, modulation parameters like the length of FFTs and the overall structure. It is necessary to understand the challenges and accomplish solutions to address these changes. Different solutions were tested by the Fraunhofer FHR passive radar department, Germany for the usage in their PCL systems.

I. Introduction

The widespread availability of broadcasting infrastructure for television and radio enables a wide range of applications. This includes the passive exploitation as a transmitter of opportunity for the detection and tracking of objects like airplanes and ships. This technique is known as passive radar where the transmitter and its infrastructure is not under the control of the radar engineer and the system has to deal with the present signals. Due to recent changes and demands by the broadcasters, digital video broadcasting has reached its second standard DVB-T2. It has already been established in several countries [2] and mostly replaces the previously used DVB-T.