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- W2020687568 abstract "Sensor arrays play a major role in underwater acoustic applications. They allow propagating signals to be spatially separated after beamforming giving direction of arrival information. They are usually designed by sensor spacing selection for a particular frequency but used over a band of frequencies. For wideband applications, arrays designed with nonuniform sensor spacing have been utilized. But many of the existing acoustic arrays are designed with uniform sensor spacing. When these arrays are used beyond their design frequency spatial resolution is reduced at low frequencies and grating lobes appear at higher frequencies based on the second-order spectrum. To define these effects a theorem and a corollary are stated and proven under general conditions. In contrast, the fourth-order cumulant spectrum provides more flexibility in choosing the frequency response at the output of a beamformer so deliterious effects of wide frequency bandwidths can be reduced. To define these improvements another theorem and corollary are stated and proven for the fourth-order cumulant spectrum. To demonstrate these theoretical results returns from an active sonar system have been simulated. The transmitted waveform is a linear frequency modulated signal and the echo is returned from a spherical target that is either stationary or in motion. The returned signal is beamformed using a one-dimensional line array of uniformly spaced sensors designed for a frequency of 4160 Hz. But the transmitted waveform has a bandwidth from 1 Hz to 8 kHz. The results are given for the matched and mismatched filtered beamformer outputs of a ten-element line array in the frequency and range domains. These results are compared with the fourth-order cumulant spectrum of the beamformer output and its range domain representation." @default.
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- W2020687568 modified "2023-09-24" @default.
- W2020687568 title "Spectra and fourth-order cumulant spectra of broadband beamformed data" @default.
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- W2020687568 doi "https://doi.org/10.1121/1.420081" @default.
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