System and method of horizontal wave measurement
AssigneeTeledyne RD Instruments, Inc.
InventorsBrandon S. Strong, Blair H. Brumley, Jerald W. Mullison
Life of this patent
Estimating the term…
Abstract
A system and method of horizontal wave measurement is disclosed. The system for measuring the directional spectrum of waves in a fluid medium having a substantially planar surface may include a sonar system having a plurality of transducers for generating respective acoustic beams and receiving echoes from one or more range cells located substantially within the beams, at least one of the plurality of acoustic beams being angled non-orthogonally to at least one other of the plurality of acoustic beams. The method may calculate the directional spectrum associated with the waves from the received echoes.
Claims31
A method of calculating wave spectra in a fluid medium utilizing a plurality of acoustic transducers, comprising:
- receiving echoes produced within at least two range cells, wherein the echoes are generated by a plurality of acoustic beams from the transducers, at least one of the plurality of beams having a substantially circular cross-section and at least one of the plurality of acoustic beams being positioned at a non-orthogonal angle with respect to at least one other of the plurality of acoustic beams, and the beams having the at least two range cells located at least partly therein and wherein the signals associated with the echoes comprise data indicative of a plurality of observed frequencies;
- for each of the plurality of observed frequencies:
- calculating a cross-spectral matrix,
- estimating the wave directional spectrum by use of the cross-spectral matrix, and
- calculating a non-directional height spectrum by use of the wave directional spectra.
A system for measuring the directional spectrum of waves in a fluid medium having a substantially planar surface, comprising:
- a sonar system having a plurality of transducers for generating respective broadband acoustic beams having a substantially circular cross-section and receiving echoes from one or more range cells located substantially within the beams, at least one of the plurality of acoustic beams being generated at a non-orthogonal angle with respect to at least one other of the plurality of acoustic beams;
- and
- a computer program, executed by a processor, configured to calculate a directional spectrum associated with the waves from the received echoes, wherein the computer program further utilizes a sensitivity vector as part of the calculation of the directional spectrum.
A system for calculating the directional spectrum of a wave in a fluid medium, comprising:
- means for generating a plurality of acoustic beams, at least one of the plurality of acoustic beams being positioned at a non-orthogonal angle with respect to at least one other of the plurality of acoustic beams, and the beams having range cells located at least partly therein;
- means for receiving echoes produced within an array comprising two or more of the range cells;
- means for processing signals indicative of the received echoes;
- means for storing a sensitivity vector, the vector being formed from data based on the signals and the geometry of the array of range cells, wherein the sensitivity vector comprises elements for at least two range cells at different depths within an acoustic beam;
- and
- means for estimating the directional spectrum of the wave based on the signals and the sensitivity vector.
Dependencies are inferred from the claim text.