1. A method for real-time calculation of the radar cross section of an object comprising: providing a processing system comprising a plurality of parallel-connected processors; providing a radar transceiver for generating radar signals and receiving reflected radar signals; defining a shooting window in the sky to be substantially illuminated by the radar signals, with the shooting window having horizontal and vertical axes; illuminating the shooting window with radar signals; receiving radar signals reflected by an object within the shooting window; dividing the shooting window into a plurality of subcells; and assigning the reflected radar signals received from the plurality of subcells to the processing units such that the assignment of adjacent subcells of the shooting window to the same processor is avoided.