Now showing items 1-5 of 5
Beamforming when the sound velocity is not precisely known
(Acoustical Society of America, 1980-08)
Beamforming is an integral part of most signal processingsystems in active or passive sonars. The delays used to generate a beam are functions of the sound velocity, which depends on temperature, salinity, and pressure. ...
Estimating bearing when the source is endfire to an array
(Acoustical Society of America, 1979-03)
Consider the problem of estimating the direction of arrival of a plane wave using a linear array of length L with M sensors. Let 0 denote the direction with respect to the array axis. Assume that we know that 0 >0. The ...
On errors in some papers on array processing
(Acoustical Society of America, 1979-02)
Some errors in the literature are noted concerning the calculation of the maximum-likelihood estimator.
Processing spatially aliased arrays
(Acoustical Society of America, 1978-09)
A linear array can detect a plane wave signai at a wrong bearing if the signal wavelengths are shorter than twice the distance between the closest adjacent sensors. This penomenon, called spatial aliasing, is most pronounced ...
Frequency-wave number array processing
(Acoustical Society of America, 1981-03)
Most array signal processing systems use delay-and-sum beamforming to estimate source bearings. This paper demonstrates the close relationship between beamforming and frequency-wavenumber spectrum analysis. The latter ...