DVB-T Signal Cross-Ambiguity Functions Improvement for Passive Radar

This paper proposes a digital video broadcasting-terrestrial (DVB-T) signal cross-ambiguity functions (CAF) improvement technique by modifying the guard interval and the pilots in the direct channel, which can remove the unwanted deterministic peaks in the DVB-T passive radar effectively. The key of CAF improvement is the pilots modification directly on the pilot carriers based on the DVB-T signal (f_s=64/7 MHz), which reduces the computation complexity and is convenient for realization as compared with the conventional filters and equalizers. The DVB-T signal is acquired by the experiments (f_s =64/7 MHz). A thumbtack CAF is achieved at the expense of 13.4% power loss (-0.6 dB)