Constant beam pattern array method
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorDehua Huang
Life of this patent
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Abstract
A method for providing a broadband constant beam pattern acoustic array includes providing an array of transducers in a known three dimensional axisymmetric spherical configuration with each transducer element having an associated signal. A user can specify a far field beam pattern for the array. Weightings are calculated for each transducer in the array as being proportional to the voltage that gives the beam pattern power level associated with the bearing for each transducer. Signal power levels for each transducer are modified in accordance with the weightings. The array can be operated for receiving and transmitting signals with a constant beam pattern over a broad range of frequencies.
Claims8
A method for providing a broadband constant beam pattern acoustic array:
- providing an array of transducers in a known three dimensional axisymmetric configuration with each transducer having an associated signal;
- receiving user specified beam pattern parameters for a three dimensional axially symmetric beam at a projected far field range of the array of transducers;
- calculating a normal angular particle velocity distribution from the user specified beam pattern parameters by assuming Hankel asymptotic conditions and utilizing Legendre polynomials;
- determining a bearing for each transducer of the array of transducers corresponding with the user specified beam pattern parameters;
- obtaining a user specified beam pattern power level;
- calculating weightings for each transducer in accordance with the calculated normal angular particle velocity distribution and as being proportional to the obtained beam pattern power level and associated with the bearing for each transducer;
- modifying a power level of the signal associated with each transducer in accordance with the calculated weighting for that transducer;
- and
- operating the array of transducers for transmitting the signal at each transducer.
A method for providing a broadband constant beam pattern acoustic array:
- providing an array of transducers in a known three dimensional axisymmetric configuration with each transducer having an associated signal;
- receiving user specified beam pattern parameters for a three dimensional axially symmetric beam at a projected far field range of the array of transducers;
- calculating a normal angular particle velocity distribution from the user specified beam pattern parameters by assuming Hankel asymptotic conditions and utilizing Legendre polynomials;
- determining a bearing for each transducer of the array of transducers corresponding with the user specified beam pattern parameters;
- obtaining a user specified beam pattern power level;
- calculating weightings for each transducer in accordance with the calculated normal angular particle velocity distribution and as being proportional to the obtained beam pattern power level and associated with the bearing for each transducer;
- optimizing the user specified beam pattern parameters by utilizing a known beam pattern function and applying user specified beam pattern parameters to the known beam pattern function;
- modifying a power level of the signal associated with each transducer in accordance with the calculated weighting for that transducer;
- and
- operating the array of transducers for transmitting the signal at each transducer.
Dependencies are inferred from the claim text.