A Fast Cancellation Algorithm for DTTB-based Passive Radar System

To reduce the computational complexity of conventional cancellation algorithm in passive radar system, a fast cancellation by the Pseudo-Noise (PN) sequence in the Digital Television Terrestrial Broadcasting (DTTB) illuminator is proposed. Based on the good correlation property of PN sequence, and the fact that DTTB illuminator is very sensitive to the Carrier Frequency Offset (CFO), the 2-D time delay and CFO estimation is proposed to improve the estimation accuracy. Once obtaining the time delay and CFO, the direct path signal reconstruction and cancellation can be made, remaining the target echoed signal and noise. Compared with the conventional cancellation method, the method has the smaller computational cost, and all the processing is on surveillance antenna, simplifying the passive radar system model by removing the reference antenna. Finally, the simulation experiments demonstrate the effectiveness of the method.