Patent ID: 6424596
Filing Date: 2002-07-23
Classification: G01S,Y10S

Abstract:
A method of reducing noise emanating from near-ocean surface noise sources without degrading energy from a target of interest, comprising the steps of:receiving acoustic signals emanating from a plurality of objects including a target of interest and at least one near ocean-surface noise source; estimating bearings to the objects in response to the received acoustic signals; generating correlation values for the received acoustic signals from different incremental locations at incremental ranges and depths along the estimated bearings; identifying acoustic signals from the generated correlation values with a specific emanating object; evaluating the identified acoustic signals to determine if any of the generated correlation values correspond to a near-ocean surface noise source; eliminating the generated correlation values that correspond to near-ocean surface noise sources; analyzing the remaining generated correlation values to locate a peak beam value; selecting an individual incremental location corresponding to the located peak beam value; generating frequency and magnitude variance criteria; determining if the frequency and magnitude variance associated with the peak beam value that corresponds to the selected incremental location meets the frequency and magnitude variance criteria; and providing bearing, range and depth information pertaining to the selected incremental location if the frequency and magnitude variance associated with the peak beam value that corresponds to the selected incremental location meets the frequency and magnitude variance criteria.