A new passive synthetic aperture technique for towed arrays

Stergiopoulos, Stergios; Urban, Heinz G.

doi:10.1109/48.126950

Cited by 73 publications

(34 citation statements)

References 9 publications

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“…This conclusion was contradictary to the result from Carey and Yen [4] that new system gain can be achieved by a passive synthetic array in non-isotropic noise, and much more discussions were brought by [6], [7], [8]. Subsequently several passive synthetic aperture techniques, such as extended towed array method (ETAM) by Stergiopoulos and Sullivan [9], the FFT synthetic aperture (FFTSA) algorithm by Stergiopoulos and Urban [10] and the maximum likelihood (ML) method by Nuttall [11], have been proposed for source parameters estimation.…”

Section: Introductionmentioning

confidence: 92%

Hybrid Cramér-Rao bound for moving array

Xie

Niu

Huang

et al. 2008

2008 42nd Asilomar Conference on Signals, Systems and Computers

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Using the Cramér-Rao bound (CRB) as an indicator of potential performance, in this work we study a moving array's ability to estimate parameters of a narrow-band signal. Specifically, the hybrid CRB on source frequency and bearing are studied for signals containing both random fading parameters and unknown deterministic ones. The derived hybrid CRB is compared to the traditional deterministic CRB [1] and the Gaussian CRB [2] in the literature. The study provides information for the effective utilization of a moving aperture in estimating source bearing and frequency.

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Section: Introductionmentioning

confidence: 92%

Hybrid Cramér-Rao bound for moving array

Xie

Niu

Huang

et al. 2008

2008 42nd Asilomar Conference on Signals, Systems and Computers

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“…The estimated covariance matrix using the previous estimate is defined as KðkÞ, given in Eq. (10). To perform the M-step, the maximization of Eq.…”

Section: A Derivative Based Maximum Likelihood (Dbml)mentioning

confidence: 99%

“…3 Or alternatively, methods exploit the temporal coherence of the source to achieve a synthetic aperture with improved spatial resolution. [9][10][11][12] Motion of the sources and platform limits the time window where the acoustic field is stationary. 13 This motivates maximum likelihood methods using structured covariance models and/or low-rank approximations that can be estimated with less training data.…”

Section: Introductionmentioning

confidence: 99%

Maximum-likelihood spatial spectrum estimation in dynamic environments with a short maneuverable array

Odom

Krolik

Rogers

2013

The Journal of the Acoustical Society of America

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This work concerns the development of field directionality mapping algorithms for short acoustic arrays on mobile maneuverable platforms that avoid the left/right ambiguities and endfire resolution degradation common to longer non-maneuverable line arrays. In this paper, it is shown that short maneuverable arrays can achieve a high fraction of usable bearing space for target detection in interference-dominated scenarios, despite their lower array gain against diffuse background noise. Two narrowband techniques are presented which use the expectation-maximization maximum likelihood algorithm under different models of the time-varying field directionality. The first, derivative based maximum likelihood, uses a deterministic model while the second, recursive Bayes maximum likelihood, uses a stochastic model for the time-varying spatial spectrum. In addition, a broadband extension is introduced that incorporates temporal spectral knowledge to suppress ambiguities when the average sensor array spacing is greater than a half-wavelength. Dynamic multi-source simulations demonstrate the ability of a short, maneuvering array to reduce array ambiguities and spatial grating lobes in an interference dominated environment. Monte Carlo evaluation of receiver operating characteristics is used to evaluate the improvement in source detection achieved by the proposed methods versus conventional broadband beamforming.

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“…(a) Principle of passive synthetic aperture In passive synthetic aperture processing, the parameters of the target are estimated by virtue of the radiated signal of the underwater target received by the virtual array [5][6][7]. As shown in Fig.1, underwater target moves in a strait line, and the nearest distance between the measuring hydrophone and the underwater target's ideal track is R0, and the radiated noise signal is sampled by the measuring hydrophone.…”

Section: Line Spectum Of the Radiated Noisementioning

confidence: 99%

Research on Location of Line Spectrum of Underwater Target Based on Passive Synthetic Aperture Method

Sanwen¹,

Hua-kui²,

Zhang³

2015

Proceedings of the 2015 International Industrial Informatics and Computer Engineering Conference

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Abstract. Considering the location demand of radiated noise source in underwater target, the method of location of line spectrum of radiated noise based on passive synthetic aperture method is presented. Line spectrum signal is received using single hydrophone, and azimuth sampling rate depends on the azimuth doppler band, and the received data of one-dimension is transformed into data of two-dimension. Azimuth compressing function is configured based on the range curve and the frequency of line spectrum, image of line spectrum is derived in frequeny-azimuth domain. Simulated results show that line spetrum of radiated noise can be located and distinguished, and the resolution is dependent on the azimuth doppler band.

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A new passive synthetic aperture technique for towed arrays

Cited by 73 publications

References 9 publications

Hybrid Cramér-Rao bound for moving array

Hybrid Cramér-Rao bound for moving array

Maximum-likelihood spatial spectrum estimation in dynamic environments with a short maneuverable array

Research on Location of Line Spectrum of Underwater Target Based on Passive Synthetic Aperture Method

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A new passive synthetic aperture technique for towed arrays

Cited by 73 publications

References 9 publications

Hybrid Cram&#x00E9;r-Rao bound for moving array

Hybrid Cram&#x00E9;r-Rao bound for moving array

Maximum-likelihood spatial spectrum estimation in dynamic environments with a short maneuverable array

Research on Location of Line Spectrum of Underwater Target Based on Passive Synthetic Aperture Method

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Hybrid Cramér-Rao bound for moving array

Hybrid Cramér-Rao bound for moving array