Correlational and spectral techniques in modern communication and control systems

The needs of the space age have imposed a severe burden on information-gathering media, forcing a new approach to communication and control systems design. These systems are now tailored for system-to-signal compatibility and must reject unwanted statistical signals that enter as unavoidable disturbances. For this purpose the general and/or special purpose computer is an indispensable tool Communication and automatic controls, two disciplines which have matured quite rapidly during the last two decades, have acquired enough importance by now to initiate a true revolution in applied science and the associated industrial activities. The commencement of the space age is a most dramatic proof of their importance. Neither satellite orbiting nor space probing is imaginable without controls of high accuracies for the keeping of vehicles on predesigned trajectories, or without communication links of comparable efficiencies for endowing the vehicles with a scientific or other purpose.