Spatial correlation sonar method for high ships speeds

A machine readable medium comprising instructions that when executed by a processor executes a process to measure a velocity of a vessel using a spatial correlation sonar hydrophone array comprising:

• 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;
• and
• 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.

A system comprising a processor configured to measure a velocity of a vessel using a spatial correlation sonar hydrophone array by:

• 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;
• and
• 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.