Apparatus for avoiding collision between a vehicle and an object that moves in a trajectory relative to the vehicle. The apparatus includes at least one microwave pulsed transmitter and receiver for transmitting a scanning beam of pulsed energy which scans a sector of space, at least forward of the vehicle,...http://www.google.de/patents/US4926171?utm_source=gb-gplus-sharePatent US4926171 - Collision predicting and avoidance device for moving vehicles
