| 摘要 |
General method for extracting an electromagnetic or other wave-propagated signal of a desired source from the overall received waveform containing the sum of signals from a multiple of such sources, independently of signal contents and modulation, comprising the steps of first expanding the spectrum of the received sum of signals in proportion to their source distances so as to spectrally isolate the signal from the desired source, selecting the isolated signal spectrum using a bandpass filter, and finally, spectrally compressing the selected signal back to its original band of frequencies. The distance dependent expansion is performed by scanning the phase gradient of the signal spectrum. If the sources are too close to one another or their signals occupy very low frequencies, the received sum of signals may be split into two or more subbands, the expansion and the selection filtering applied individually to each subband, and the selected signal subbands then recombined to obtain the desired signal. Related method for computing the spread of source distances by measuring low and high frequency bounds of the expanded sum of signals or subbands, or by plotting the expanded sum of signals or subbands on a graph. |
