Track Registration for Multistatic Radars with Multipath

Bistatic radars deployed in built-up areas, suffer from the effects of multipath due to the presence of reflecting walls. When the geometry of the reflecting surfaces are accurately known, it is possible to identify and utilize radar measurements from the various multipath signals but only if the radar receivers are well registered. Given a 2-D scenario with a single moving target, a smooth reflecting wall, a radar transmitter and two noncollocated radar receivers, we investigate the observability of target state and sensor biases for the following multipaths: (i) direct path: transmitter-target-receiver, (ii) transmitter-wall-target-receiver, (Hi) transmitter-target-wall-receiver, (iv) transmitter-wall-target-wall-receiver. Each radar receiver has a known location and measures range (propagation path length), azimuth, and doppler but has unknown range and azimuth biases in its measurements. Results show that measurements from different multipath signals can be identified. Furthermore, a selection of these measurements can be combined to carry out track registration.