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Robust beam forming method based on steering vector and space power estimation

A steering vector and space technology, applied in the field of signal processing, can solve the problems of the decrease of the output signal-to-noise ratio of the receiving end, affecting the overall performance of the system, and the deviation of weight design weights, so as to achieve accurate signal steering vector estimation and achieve accurate estimation. Effect

Active Publication Date: 2019-03-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

This method can obtain accurate signal steering vector estimation in high SNR scenarios, but there will be obvious performance degradation when low SNR and strong interference appear in the signal integration interval, and its robustness to the above scenarios is poor
[0006] Although the above estimation methods can estimate the signal-steering vector more accurately to a certain extent, there are unavoidable limitations in application scenarios, which makes the estimated signal-steering vector estimation inaccurate
However, this inaccuracy will have a great impact on the array signal processing effect. In beamforming, there will be a large deviation between the weight design of the final adaptive beamforming and the ideal weight, resulting in a large signal-to-noise ratio at the receiving end. decline, seriously affecting the overall performance of the system

Method used

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  • Robust beam forming method based on steering vector and space power estimation
  • Robust beam forming method based on steering vector and space power estimation
  • Robust beam forming method based on steering vector and space power estimation

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Embodiment 1

[0088] The present invention simulates the change of the signal-to-interference and noise ratio of the beam output signal-to-noise ratio with the expected signal-to-noise ratio of the signal steering vector estimation algorithm with errors in the signal and interference direction of arrival:

[0089] A uniform linear array composed of 10 omnidirectional array elements receives narrowband signals emitted by 3 far-field sources, estimated signals and interference directions The relationship with the true arrival direction θ is Among them, Δθ is a uniform distribution in the interval [-8°, 8°]. When strong interference occurs in the main lobe of the beam, it is assumed that the estimated direction of arrival of the signal is The estimated arrival azimuths of the two interferences are The corresponding interference-to-noise ratio is 30dB. For the desired signal, set ρ=0.9 and the input signal-to-noise ratio change range is -10 to 30dB. The number of snapshots of the array is 30, ...

Embodiment 2

[0097] A uniform linear array composed of 10 omnidirectional array elements receives narrowband signals emitted by 3 far-field sources, estimated signals and interference directions The relationship with the true arrival direction θ is Among them, Δθ is a uniform distribution in the interval [-8°, 8°]. When strong interference occurs in the main lobe of the beam, it is assumed that the estimated direction of arrival of the signal is The estimated arrival azimuths of the two interferences are The corresponding interference-to-noise ratio is 30dB. For the desired signal, set ρ=0.9 and the input signal-to-noise ratio is 20dB. The number of snapshots of the array varies from 10 to 100, and 200 Monte Carlo experiments are performed. In each Monte Carlo experiment, the error of the signal and interference direction of arrival obeys the above-mentioned uniform distribution.

[0098] details as follows:

[0099] ① Perform discrete sampling in the angle interval where the signal is loc...

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Abstract

The invention provides a robust beam forming method based on a steering vector and space power estimation, so as to improve the robustness of random errors on an incoming wave direction and to realizeaccurate signal steering vector estimation under the condition of interference in a main lobe of a beam. The invention provides a signal plus interference covariance matrix reconstruction algorithm,which introduces a correlation coefficient to serve as a signal subspace selection criterion, reconstructs a sampling covariance matrix signal plus interference subspace, and performs alternate projection in combination with a covariance matrix containing a signal subspace and obtained by signal angle interval discrete sampling, so as to perform the accurate signal steering vector estimation and to design a robust adaptive beam former under the condition of interference in the main lobe of the beam.

Description

Technical field [0001] The present invention belongs to the technical field of signal processing, and relates to a steering vector estimation method based on signal plus interference covariance matrix reconstruction and alternate projection, which is robust to random errors in the direction of arrival, and achieves accuracy when interference occurs in the main lobe of the beam Signal steering vector estimation. Background technique [0002] Robust adaptive beamforming technology has been widely used in mobile communications, navigation, remote control telemetry, radar, sonar and other fields, and has gradually covered all aspects of national defense and people's daily life. However, in actual scenarios, the specific position of the target signal is usually unknown, which will lead to deviations in the signal steering vector estimation and seriously affect the overall performance of the array. Therefore, researchers have proposed a variety of signal processing techniques to allevi...

Claims

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Application Information

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IPC IPC(8): H04B7/0408H04B7/06H04B17/336
CPCH04B7/0408H04B7/0617H04B17/336
Inventor 艾晓宇马俊虎安建成甘露廖红舒
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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