Signal processing in active shielding and direction-finding techniques

On the basis of the analogy between time and space sampling electrical emitters can be identified and localized. The traditional method of screening (passive shielding) and the new technique (active shielding), based on the generation of interference signals capable of creating screening barriers, are compared. By using signal processing techniques the minimization of the mean square error (MSE), taken as the optimality criterion, shows that active screening has performance comparable with passive screening, as long as interference signals are related to the signals which one wants to protect.