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Robust adaptive beam forming method based on diagonal loading

An adaptive beam, diagonal loading technology, applied in the field of array signal processing and digital signal processing, can solve the problems of large norm, lack of theoretical guidance, difficult to select, etc., to overcome performance loss, improve robustness, and enhance robustness sexual effect

Inactive Publication Date: 2018-01-05
TIANJIN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of accurate theoretical guidance, it is difficult to select the optimal loading factor
If the selected loading factor is too small, the norm of the weighting vector will be too large to effectively suppress the noise beam; when the weighting factor is too large, it will weaken the ability of the beamformer to suppress interference and reduce noise, so when selecting the loading factor Often a compromise is required

Method used

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  • Robust adaptive beam forming method based on diagonal loading
  • Robust adaptive beam forming method based on diagonal loading
  • Robust adaptive beam forming method based on diagonal loading

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Experimental program
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Embodiment Construction

[0018] Step 1: Calculate the sampling covariance matrix R of the signal received by the radar antenna array:

[0019] According to the structural model of the radar antenna array receiving signal, the snapshot model of the radar antenna array receiving signal with the number of elements N is defined as follows: x(k)=s(k)+i(k)+n(k), where s(k) represents the desired signal, i(k) represents the interference signal, and n(k) represents the noise signal. The covariance matrix of the received signal of the sensor array is constructed from the received signal x(k) sampled by K snapshots: K is the number of sampling snapshots, x(k) is the kth sampling snapshot, ( ) H is the Hermitian transpose.

[0020] Step 2: Calculate the weight vector w of the Capon beamformer c :

[0021] A typical Capon beamformer can be expressed as the following optimization problem:

[0022]

[0023] Using the Lagrange operator, the weight vector of the Capon beamformer can be obtained as:

[0024]...

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Abstract

The invention relates to a robust adaptive beam forming method based on diagonal loading. The method includes the following steps: calculating a sampling covariance matrix R of radar antenna array receiving signals by using receiving signals x(k) which are snapshot sampled for K times; obtaining the wave forming vector of a Capon beam forming device by using a Lagrange operator; calculating the weighted vector wDL, i.e., respective array element added weight of a radar antenna array by using diagonal loading; and outputting an adaptive beam forming of the radar antenna array.

Description

technical field [0001] The invention belongs to the field of digital signal processing and relates to beam forming technology in the field of array signal processing. Background technique [0002] Beamforming is an important research content in the field of array signal processing, which is widely used in radar, sonar, wireless communication, voice signal processing, medical imaging, seismology and other fields. Among many adaptive beamforming algorithms, the Capon beamforming algorithm is favored by researchers because of its good performance and flexible expression. However, the standard Capon beamforming algorithm relies on some assumptions about the array, signal model, etc. When there is an error in the steering vector, the performance of the beamformer is seriously degraded. In order to improve its robustness, a variety of robust adaptive beamforming algorithms based on the Capon beamforming algorithm have emerged in recent decades. [0003] The robust adaptive beamf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02
Inventor 金桐之王安国冷文
Owner TIANJIN UNIV