Application of Filters to Some Trivial Time-Varying Systems

In practice there are some cases where the signal and the noise of the message vary in the same manner with time. The time-varying filter then becomes quite simple and attractive. lt consists of the classical Wiener´s filter multiplied and divided by the time-dependent deterministic function. Two examples of airborne tracking radar used in a dog-fight attack and an airborne laser range finder are presented as examples of the possible realization of such filters.