Patent attributes
A predictive collision radar system in a vehicle incorporates a first antenna and a guard antenna, the associated radiation patterns of which overlap with one another, but the radiation pattern of the guard antenna is broader than that of the first antenna. A comparison of signals from the first and guard antennas provides for rejecting targets that are not likely a threat to the vehicle. In one embodiment the first antenna is a multi-beam antenna with an electromagnetic lens, for example, either dielectric or planar, and a signal from a forward looking element thereof is compared with the signal from the guard antenna aligned therewith. In another embodiment, an electromagnetic lens is adapted to cooperate with the guard antenna so as to provide for forming the associated radiation pattern.
