Process and apparatus for extracting a useful signal having a finite spatial extension at all times and which is variable with time

摘要

A process for the extraction of a time-variable useful signal having a finite spatial extension by an array of N sensors or transducers (N being equal to or greater than 3), that receive the useful signal to which have been added q spatially coherent additive noises (q being less than N). According to the process, unprocessed signals are acquired on the output of each sensor, filtered in order to restrict them to the frequency band of the useful signal and digitized. Then, spatial prediction error signals of the noise are calculated and analyzed so as to carry out the detection of the useful signal and its separation from the q additive noises. A device for extracting a useful signal according to the process is also disclosed.