Shifted sideband beamformer

Pridham, Roger G.; Mucci, Ronald A.

doi:10.1109/tassp.1979.1163329

Cited by 20 publications

(9 citation statements)

References 14 publications

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“…Although developed for low-pass signals, this technique may also be applied to bandpass signals by using band shifting (Van Trees, 1971; Pridham and Mucci, 1979). Also, the procedures introduced in Secs.…”

Section: Discussionmentioning

confidence: 99%

Digital frequency-domain implementation of optimum broadband arrays

Liu

Sideman

1995

The Journal of the Acoustical Society of America

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The problem considered is that of implementing the optimum broadband arrays whose weights are functions of frequency that have been derived based on a certain performance criterion. The sensor signals are decomposed with a fast Fourier transform (FFT) filterbank so that each frequency component may be faithfully beamformed with these optimal weights. A method of time interpolation by padding zeros in the frequency domain is developed for a high precision phase delay, without increasing the sensor channel sampling rate. An input and output pruned decimation-in-frequency FFT algorithm is also developed for an efficient practical computation procedure. Error factors affecting the accuracy of this technique are specified and suggestions concerning reduction of these errors are given. ¸

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Section: Discussionmentioning

confidence: 99%

Digital frequency-domain implementation of optimum broadband arrays

Liu

Sideman

1995

The Journal of the Acoustical Society of America

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“…It follows from (9) that the region of support (ROS) of is shown by the two solid line segments in Fig. 1 (right) that are contained inside the temporal frequency bands on the straight line (10) which passes through the origin of making an inclination angle to the axis. Hence, the ROS of the spectra of all such 2-D ST PWs, having , are confined to the double-trapezoidal-shaped shaded area shown in Fig.…”

Section: A Review Of St Planes Waves and Their Spectramentioning

confidence: 99%

Beamforming of Broad-Band Bandpass Plane Waves Using Polyphase 2-D FIR Trapezoidal Filters

Gunaratne

Bruton

2008

IEEE Trans. Circuits Syst. I

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A new discrete-domain method is proposed for the beamforming of temporally broad-band bandpass plane waves (PWs) using a real-coefficient 2-D spatio-temporal (ST) finite-impulse response (FIR) filter having a novel rectangularly symmetric double-trapezoidal-shaped passband. The arriving temporally broad-band-bandpass ST PWs are received by a 1-D uniformly distributed sensor array. The sensor signals are pre-filtered, down-shifted to the intermediate frequency (IF) band, low-pass filtered and synchronously sampled by the real IF tri-stage temporal sampler array, resulting in a real-valued 2-D sampled sequence. The beamforming operation is then carried out on this 2-D sampled sequence using the real-coefficient 2-D FIR double-trapezoidal filter. Arithmetic complexity in the hardware implementation of the 2-D FIR double-trapezoidal filter is significantly reduced by using an array of real-coefficient polyphase 1-D FIR filters. Experimental results have confirmed that this method is capable of enhancing the desired temporally broad-band-bandpass ST PWs according to their directions of arrival under severe co-channel interference.Index Terms-2-D filter, beamforming, broad-band bandpass signals, double-trapezoidal-shaped passband, finite-impulse response (FIR), polyphase, spatio-temporal (ST) plane waves (PWs).

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“…Secondary beams that exist at high angles (because the element spacing is greater than h/2) do not cause ambiguities since all signals arrive within & 15" of horizontal. The angular precision (defined as the ability of an array to measure the arrival angle of an isolated arrival) is given by a formula analogous to (1) has been implemented [24]; the signal bandwidth is too great to permit the application of simple phase-shift beamforming.…”

Section: Verticai-array Performancementioning

confidence: 99%

Reciprocal acoustic transmissions: Instrumentation for Mesoscale monitoring of ocean currents

Worcester

Spindel

Howe

1985

IEEE J. Oceanic Eng.

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Abstruct-By simultaneously transmitting acoustic pulses in opposite directions between two points in midocean, one can separate the effects of ocean currents on acoustic propagation from the effects of sound-speed strncture. Reciprocal acoustic transmissions can therefore be used to measure ocean currents. Acoustic transceivers have been designed and built to measure the mean currents between two points separated by 300 km. The equipment functioned satisfactorily during a short test conducted during 1983. Preliminary analysis of that experiment has yielded differential travel times that appear reasonable, but more work is required to relate the differential travel times to meaningful ocean-current estimates.

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Shifted sideband beamformer

Cited by 20 publications

References 14 publications

Digital frequency-domain implementation of optimum broadband arrays

Digital frequency-domain implementation of optimum broadband arrays

Beamforming of Broad-Band Bandpass Plane Waves Using Polyphase 2-D FIR Trapezoidal Filters

Reciprocal acoustic transmissions: Instrumentation for Mesoscale monitoring of ocean currents

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