Environmentally controlled free‐field towed array calibration system
نویسندگان
چکیده
منابع مشابه
Towed Array Technology: Development for a Better Sonar System Performance
In present missions of submarines, the detection of hostile targets is one of the main objectives. To achieve these objectives modern submarines are well equipped with sonar sensors and signal processing units for all acoustical frequency ranges. The detection and analysis of silent or distant targets is the main task of towed array systems. Towed arrays have their advantages in the low frequen...
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.A beamspace adaptive beamformer implementation for the rejection of cable strum self-noise on passive sonar towed arrays is presented. The approach focuses on the implementation of a white noise gain constraint based on the scaled projection technique due to Cox et al. [IEEE Trans. on ASSP, Vol. 35 (10), Oct. 1987]. The objective is to balance the aggressive adaptation necessary for nulling th...
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During maneuvering, towed array beamforming degrades if a straight array is assumed. This is especially true for high-resolution adaptive beamforming. It is experimentally demonstrated that adaptive beamforming is feasible on a turning array, provided that array shape is estimated. The array shape can be inferred solely from the coordinates of the tow vessel’s Global Positioning System (GPS) wi...
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Conventional active sonar processing systems typically reduce the sensor data from an intensity map to a pointmeasurement form via a detection thresholding process. This approach is often sufficient for detecting and tracking high signal-to-noise-ratio (SNR) targets but becomes more challenging for low SNR targets. Track-Before-Detect (TkBD) is an alternative tracking technique that supplies ra...
متن کاملEigenvalues of the sample covariance matrix for a towed array.
It is well known that observations of the spatial sample covariance matrix (SCM, also called the cross-spectral matrix) reveal that the ordered noise eigenvalues of the SCM decay steadily, but common models predict equal noise eigenvalues. Random matrix theory (RMT) is used to derive and discuss properties of the eigenvalue spectrum of the data SCM for linear arrays, with an application to ocea...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1992
ISSN: 0001-4966
DOI: 10.1121/1.405316