Theoretical and numerical simulation to control the wideband interfering noise by the broadband constant beam pattern...

Area of Science:

• Acoustics
• Signal Processing
• Array Theory

Background:

• Interfering directional noise sources pose challenges in signal processing.
• Cylindrical arrays offer unique spatial filtering capabilities.

Purpose of the Study:

• To develop a broadband noise suppression technique for cylindrical arrays.
• To cancel or suppress wideband interfering directional noise sources.

Main Methods:

• Applied broadband azimuthal constant beam pattern (CBP) cylindrical array synthesis theory.
• Modified array shading functions by implanting zeros.
• Utilized Fourier cosine and sine series expansion for beam pattern convergence.
• Simulated noise suppression for Legendre, Dolph-Chebyshev, and Taylor shading functions.

Main Results:

• Successfully created nulls in the beam pattern directed towards noise sources.
• Demonstrated broadband CBP performance in the azimuthal plane.
• Validated the method for modified Legendre polynomial, Dolph-Chebyshev, and Taylor shading functions.
• Achieved wideband noise source suppression.

Conclusions:

• The modified shading function effectively suppresses wideband noise.
• A single set of real shading functions provides broadband noise cancellation across the operating band.
• The method maintains broadband constant beam pattern performance for cylindrical arrays.