A Design Method of Circular Array Constant Beamwidth Beamformer

A circular array, constant beam width technology, applied in the direction of instruments, sounding instruments, etc., can solve the problems of inaccuracy and complicated operation, and achieve the effect of simple method

Active Publication Date: 2016-11-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a circular ring array constant beam width beamformer design method, which solves the deficiencies of complex operation and inaccuracy in the prior art

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  • A Design Method of Circular Array Constant Beamwidth Beamformer
  • A Design Method of Circular Array Constant Beamwidth Beamformer
  • A Design Method of Circular Array Constant Beamwidth Beamformer

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specific Embodiment

[0064] (1) Refer to figure 1 and 2 . The circular array includes M uniformly distributed array elements. Since the annular array pays more attention to the performance of beamforming in the horizontal plane, the expected beam is only a two-dimensional beam in the horizontal range. The desired beam is theoretically calculated by the circular ring array at the reference frequency, and its expression is:

[0065] B d ( k r a r , φ ) = Σ m = 0 M - 1 ω m * ( k r a r ) E ...

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Abstract

The invention relates to a design method of a circular ring array constant beam width beamformer, and proposes a simple and accurate constant beam width beam former design method for a uniform circular ring array. Using the properties of circular matrix, this method gives an exact solution to the least square error beam pattern synthesis problem of annular array, and expresses the final synthesized beam and the least square error simply as the sum of superposition of subcomponents. A closed-form expression for the constant-beamwidth beamformer weight vector can be obtained when the desired beam is transformed into an appropriate form. The invention overcomes the disadvantages of complex operation and inaccuracy in the prior art: the optimal solution is accurately expressed as the superposition sum of subcomponents, and has a closed expression.

Description

technical field [0001] The invention belongs to a design method of a beamformer, and relates to a design method of a ring-shaped array constant beamwidth beamformer, which is suitable for wide-band target detection and wide-band target orientation estimation of a ring-shaped array, and belongs to underwater acoustics and array signal processing and sonar technology. Background technique [0002] Due to the simple formation, no starboard and starboard ambiguity, and the ability to form a substantially constant beam in the entire circumference, the circular array is widely used in the fields of sonar, radar, communication, and voice engineering. There are also endless signal processing methods for this array, among which the broadband beamforming method has received great attention. [0003] Because the beam output by conventional arrays varies with frequency, especially when the signal is incident from other directions of the main lobe, the spectrum of different frequency si...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/34
Inventor 杨益新汪勇马远良何正耀
Owner NORTHWESTERN POLYTECHNICAL UNIV
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