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- W1988329384 abstract "The signal-to-noise ratio of received radiation is enhanced by properly combining the output from a collection of sensors which are connected as an array. In an infinite homogeneous medium, such as a deep ocean layer, the array is matched to the incoming signal by adjusting the phases or time delays of the sensor output so that the signals may be added coherently. This technique, called beamforming, can be performed in either the time-space or the frequency-wave-number domain in order to estimate the source bearing. Beamforming, however, is inappropriate if the waveguide boundaries significantly affect the radiation field. The maximum-likelihood estimators of source bearing and depth are reviewed in this paper, and the results extended to the general problem of estimating the location of a source in a finite waveguide. The optimal array design for estimating source depth in an infinite, homogeneous, horizontal waveguide is shown to be horizontal, and thus a horizontal array can be used to obtain source depth as well as bearing in a shallow waveguide. When the waveguide is closed, the degrees of freedom of the noise is limited to M, the number of modes excited by the source. Thus there is no gain in signal-to-noise ratio by using more than M sensors in the array. The rose of the maximum likelihood estimator of source location is of the order of M−1." @default.
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- W1988329384 date "1976-04-01" @default.
- W1988329384 modified "2023-09-25" @default.
- W1988329384 title "Measuring source location in a steady state waveguide" @default.
- W1988329384 doi "https://doi.org/10.1121/1.2002439" @default.
- W1988329384 hasPublicationYear "1976" @default.
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