Method of forming stable adaptive wave beams of space distribution scattering source

A technology of adaptive beam and spatial distribution, applied in the direction of spatial transmit diversity, diversity/multi-antenna system, etc., can solve the problem of performance degradation of adaptive beamformer

Inactive Publication Date: 2013-08-21
JIANGSU HENGXIN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] (2) When other array mismatches also exist, how to ensure that the performance degradation of the adaptive beamformer caused by signal mismatch and other mismatches is improved under all mismatch conditions

Method used

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  • Method of forming stable adaptive wave beams of space distribution scattering source
  • Method of forming stable adaptive wave beams of space distribution scattering source
  • Method of forming stable adaptive wave beams of space distribution scattering source

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Embodiment 1

[0064] This embodiment is a robust adaptive beamforming method for spatially distributed scattering sources, and it is a robust beamforming method when signal mismatch exists. This embodiment assumes that the array is an ideal uniform linear array, the number of array elements M=10, and the array element spacing is a half wavelength.

[0065] In actual beamforming applications, the assumed signal covariance matrix often has certain errors, that is, between the assumed signal covariance matrix Rs and its real value There is a certain mismatch between them. And assume the following relationship:

[0066] R ^ s = R s + Δ - - - ( 1 )

[0067] Among them, Δ is an unknown Hermitian error matrix, which is used to describe the influence of the mismatch of the useful sig...

Embodiment 2

[0089] This embodiment is a robust adaptive beamforming method for spatially distributed scattering sources, which is a robust beamforming method when signals and other mismatches coexist, assuming that the array is an ideal uniform linear array. The number of array elements M=10, and the interval between array elements is half a wavelength.

[0090] If we consider other types of mismatches, such as all mismatches caused by data non-stationarity, small training sample size, and equalization error, so between the assumed sample covariance matrix R and its true value There will also be a certain mismatch between, namely:

[0091] R ^ = R + Δ 1 - - - ( 15 )

[0092] where Δ 1 It is an unknown Hermitian error matrix, which is used to describe the influence of other array response mismatches. It...

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Abstract

The invention discloses a method of forming stable adaptive wave beams of a space distribution scattering source. Firstly, received data are utilized to form a covariance matrix, secondly, mismatch constrained parameters are selected and an optimum weighting vector of an adaptive beam former is calculated according to the method of forming the stable adaptive wave beams of the space distribution scattering source, and finally the method of forming the stable adaptive wave beams is obtained. The method of forming the stable adaptive wave beams of the space distribution scattering source can solve the problem how to improve sharp performance reduction of the adaptive beam former when an assumed signal array response is not matched with an actual value, and the technical problem that the performance of the adaptive beam former is reduced due to signal mismatch and other mismatches under the condition that all mismatches exist, and can be widely applied to adaptive array processing in the field of radars, communication, medical imaging, microphone micro-arrays, seismic exploration and the like.

Description

technical field [0001] The invention relates to the field of adaptive beamforming, in particular to a robust adaptive beamforming method for spatially distributed scattering sources that improves the performance of the beamformer when the signal array response is mismatched. Background technique [0002] Adaptive beamforming techniques are widely used in radar, sonar, seismology, microphone array speech processing, and wireless communications. And when there is a mismatch between the assumed array response of the desired signal and its true value, the performance of the beamformer will degrade dramatically. Likewise, smaller training samples can cause beamformer performance degradation when the array response of the signal is accurately known. Therefore, robustness becomes a must requirement for adaptive array processing. [0003] In traditional robust adaptive beamforming methods, such as linear constrained minimum variance (LCMV) beamforming method, eigenspace-based (ESB...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
Inventor 刘聪锋徐国强吴华良叶夏良杨洁李平
Owner JIANGSU HENGXIN TECH CO LTD
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