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Robust broadband beamformer design method based on probability constraint

A design method and shaper technology, applied in the direction of instruments, radio wave measurement systems, etc., can solve the problems of overconservatism, expected signal attenuation, etc., and achieve the effect of intuitive adjustment, intuitive method, and good passband beam response performance

Active Publication Date: 2018-12-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the existing design methods based on mismatch error expectation and variance information still have the problem of being too conservative, and the expected signal attenuation is true.

Method used

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  • Robust broadband beamformer design method based on probability constraint
  • Robust broadband beamformer design method based on probability constraint
  • Robust broadband beamformer design method based on probability constraint

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Embodiment 1

[0099] The comparison chart of the passband frequency non-deformation energy comparison chart and the WNG comparison chart of the robust design method based on the probability constraint and the conventional stopband constraint optimization method and the conventional worst performance optimization design method under different conditions

[0100] Consider a linear array composed of M=7 array elements, the distance between the array elements is d=0.04m, and the number of filter taps after each array element is L=20. Set sampling frequency f s =8000Hz, and the frequency band considered is [1500,3500]Hz, the angle range of the passband is [80°,100°], and the angle range of the stopband is [0°,60°]∪[120°,180° ]. Passband expected response is P d (θ p ,f)=exp{-j2πf(L-1)f s -1 / 2}, and the stopband parameter Γ sb =-6dB. For the microphone error information, we assume |E[Δa m ]|≤0.02, |E[Δd m ]|≤0.0007, |Var[Δa m ]|≤0.015, And |Var[Δd m ]|≤2×10 -6 m 2 . K=40, N p = 20. The result ...

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Abstract

The invention discloses a robust broadband beamformer design method based on a probability constraint, and belongs to the technical field of array signal processing. The method comprises the followingsteps of firstly, converting a probability problem into a convex optimization problem by inequation deformation; secondly, calculating a robust parameter when it is assumed that the known microphonemismatch error prior information is the uncertain maximum boundary of respective mismatch error expectations and variances; then, determining a probability selection range according to the feature ofthe convex function varying with parameters; finally, obtaining a robust far-field broadband beamformer weighted value with good pass-band frequency invariant performance by appropriate probability parameter selection. Under the same error condition, the method not only has good robustness, but also has better pass-band consistency gain, thereby ensuring that a signal does not produce significantdistortion.

Description

Technical field [0001] The invention relates to a design method of a robust broadband beamformer based on probability constraints, and belongs to the technical field of array signal processing. Background technique [0002] In audio and voice signal processing, the design of beamformers using microphone arrays is an important research direction. Fixed-weight beamformers are widely used because they are not dependent on received data, are simple in design and easy to implement, and have good real-time performance. However, in fact, the fixed-weight beamforming design will be affected by the microphone mismatch error in the actual environment, which will result in a substantial decrease in the performance of the fixed-weight beamformer, not only causing interference or noise to be effectively suppressed, but even causing serious attenuation of the desired signal . Therefore, designing a broadband fixed-weight beamformer with robust performance is an important research direction at...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52
CPCG01S7/52
Inventor 鲍彧陈华伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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