Signal Processing in Passive Multistatic Tracking Radars

A passive multistatic radar system that tracks airborne targets in cartesian coordinates by using sound/picture carrier etc. signals of VHF/UHF-band, commercial television (TV) signals as the illuminator is proposed. This system comprises four separately-located passive receiving stations that calculate the Doppler shifts on the carrier arising from target dynamics and a central tracking station that processes these data with an extended Kalman filter (EKF) to estimate the velocities and positions of the target. The fact that the system does not emit signals provides covertness and immunity against potential counter-measures; on the other hand the fact that the system is multistatic and that operates at VHF/UHF band provides effectiveness against targets that use stealth techniques. In this work, principles of the proposed system are given and a simulation in which a randomly maneuvering target is tracked with the extended Kalman filter is demonstrated