A vector-hydrophone~s minimal composition for finite estimation-variance in direction-finding near a rigid reflecting boundary

2005 ◽  
Author(s):  
J. Ahmadi-Shokouh ◽  
H. Keshavarz
Keyword(s):  
Direction Finding ◽  
Estimation Variance ◽  
Vector Hydrophone

Calibration of Vector Hydrophones in Deep Water

2013 ◽  
Vol 336-338 ◽  
pp. 303-308
Author(s):  
An Bang Zhao ◽  
Bin Zhou ◽  
Jiang Qiao Li
Keyword(s):  
Hydrostatic Pressure ◽  
Relative Sensitivity ◽  
Direction Finding ◽  
Calibration Laboratory ◽  
Vector Hydrophone ◽  
Frequency Independent ◽  
Vector Direction ◽  
Sensitivity Changes ◽  
Inhibition Performance ◽  
National Defence

To apply vector hydrophone to deep-sea detection, a calibration test of the vector hydrophone under different hydrostatic pressure was taken in the national defence underwater acoustics calibration laboratory. The effect of the relative sensitivity changes between channels on the vector hydrophones direction finding and zero-inhibition performance is explored, and the principle model for the influence of the directivity deviation on vector direction measuring is established. Meantime, the phase compensation between channels is found to be frequency-independent. The omnidirectional method is proposed to compensate the directional rotation. As a result, the influences of the hydrostatic pressure on direction finding are effectively reduced.

Symmetric-pair antennas for beam steering, direction finding or isotropic-reception gain

1991 ◽  
Vol 138 (4) ◽  
pp. 368 ◽  
Author(s):  
R. Benjamin ◽  
W. Titze ◽  
P.V. Brennan ◽  
H.D. Griffiths
Keyword(s):  
Beam Steering ◽  
Direction Finding ◽  
Symmetric Pair
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