Blind extraction of target signals

摘要

A system and method allow for extracting target signals from the overall measurement data without knowing how and where these data are collected, the locations and characteristics of target sources as well as those of random background noise sources. In essence, it uses an innovative and advanced signal processing technique to reveal certain critical information from a mixture of data that is hard to obtain otherwise. In particular, it allows for denoising the measured data that have been contaminated by various interfering and background noise, making it possible to extract certain target information that may be otherwise difficult to observe. The only assumption made in this method is that the target signal is incoherent with respect to all interfering signals and background noise. The more information about a target signal is available, the more complete the extracted signal becomes.

主权项

1. A method for extracting a target signal from measured signal including the steps of:
a) measuring a target signal and background noise to obtain measurement data; b) using a computer to extract coherent structure from the measurement data using wavelets and corresponding wavelet coefficients; c) comparing the wavelet coefficients of the wavelets with a threshold with the computer; d) eliminating the wavelet coefficients of the wavelets that are less than the threshold with the computer; e) determining approximation coefficients at a selected scale m after said steps a)-d) based upon the wavelet coefficients at scale m; f) determining a wavelet vector at scale m based upon the approximation coefficients; and g) extracting information at scale m based upon the wavelet vector with all wavelet coefficients set to zero except those at the scale m.