Passive bistatic radar(PBR) is a specific case of bistaticradars that exploits the existing non-radar transmitters of opportunity in the environment. Since there is no dedicated transmitter in these, they have lower costs of procurement, operation and maintenance. Also they are physically small, difficult to be located, resistent to anti-radiation missiles, and they do not need frequency allocations. Besides, bistatic nature of these radars protects them against intentional interference and makes them capable for detection of low-observable targets. In contrast, passive radars have some disadvantages as well. Opportunity waveforms are not originally designed for radar operation and are no longer under the control of the radar designer. In addition, PBR systems do not have the information of such waveforms directly and hence must use a dedicated receiver channel, known as "reference channel". Therefore all the PBR system receivers include two receiving channels denoted by reference channel and target channel. In low radio frequency bands such as UHF and VHF, achievable gain of the antenna is limited so the antenna’s beam is relatively wide. Hence the target channel antenna will receive the transmitter’s direct signal as well. As a result signal processing operation is much more complex in passive radars than in active radars. Among broadcast and communication signals that have been considered and analyzed as possible passive radar sources, the thumbtack ambiguity function of the Digital Video Broadcasting-Terrestrial (DVB-T) signal, in addition to being stationary over time, makes such a signal a good candidate for passive applications. However, DVB-T signal has some deterministic components that cause certain ambiguities in its ambiguity function at non-zero delay and varying Doppler offsets. These ambiguities reduce the effectiveness of the radar system as they mask targets at these Keywords: Bistatic Radar, Passive Radar, DVB-T, GLR Detector
