ABSTRACT
Gating is added to limit the search for the clue to the most probable region in the signal processor output. To enhance a deteriorating clue in the presence of varied interferences, windowing is incorporated into the basic signal processing stage. The windows are designed to remedy or compensate for physical conditions that affect unfavorably the performance of a given signal processor. Windowing and gating have been the subject of extensive studies for both types of channels. Windowing attenuates the spectral content of a function being processed. The simplistic scheme of independently selecting the dominant clue from the total signal processor output can deliver erratic time interval estimates, whenever adverse but temporary conditions exist at the input. The channel may be distortionless or display distortion/dispersion and may contain noise/interference. In a multipath situation with an effective single sensing point, the estimated time intervals are the time delays among the channel paths.
