Spatial correlation sonar method for high ships speeds

Details Spatial correlation sonar method for high ships speeds Spatial correlation sonar method for high ships speeds

2011-08-23

2011-08-23

Pihulic, Dan (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Speed determination

Reexamination Certificate

active

08004934

ABSTRACT:
In an embodiment, a process measures a velocity of a vessel using a spatial correlation sonar hydrophone array. The process includes the step of selecting a correlation time such that a correlation occurs between an early pulse and a later pulse on a first hydrophone and a second hydrophone respectively, wherein the first hydrophone and the second hydrophone are maximally separated in the spatial correlation sonar hydrophone array. The process further includes the step of selecting a time spacing between a first pulse and a second pulse such that the spacing is a function of the correlation time and a constant, wherein the constant is proportional to a size of the spatial correlation sonar hydrophone array, and wherein the correlation time is an approximate multiple of a sum of a time between the first pulse and the second pulse and a time between the second pulse and a next first pulse.

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