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Diagonal loading based adaptive beamforming method for array antenna

An adaptive beam and array antenna technology, applied in radio wave measurement systems, diversity/multi-antenna systems, space transmit diversity, etc., to achieve the effect of low accuracy requirements and little prior information

Active Publication Date: 2015-02-18
XIDIAN UNIV
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Problems solved by technology

[0005] In order to achieve the above purpose, the present invention aims at the sample data covariance matrix obtained when the number of samples is small and the training samples are polluted. Firstly, the diagonal loading technique is used to correct the covariance matrix of the sample data, and then the corrected sample data The covariance matrix calculates the steering vector of the desired signal and the signal-to-interference-noise ratio of the output, and the present invention adopts the following technical scheme to realize

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  • Diagonal loading based adaptive beamforming method for array antenna
  • Diagonal loading based adaptive beamforming method for array antenna
  • Diagonal loading based adaptive beamforming method for array antenna

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[0026] The present invention will be further described below in conjunction with accompanying drawing:

[0027] refer to figure 1 , is a flow chart of an array antenna adaptive beamforming method based on diagonal loading of the present invention. The adaptive beamforming method based on the diagonal loading technique includes the following steps:

[0028] Step 1. Use the array antenna to receive signals from the outside. The array antenna is a uniform linear array (denoted as ULA) composed of M array elements. The array element spacing of the array antenna is expressed as d, d=λ / 2, and λ represents the array The wavelength of the signal received by the antenna; the signal received by the array antenna at time k is expressed as x(k), and the signal received by the array antenna includes the desired signal, interference signal and noise.

[0029] Specifically, in step 1, the array antenna is used to receive signals from the outside, and the array antenna is a uniform linear a...

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Abstract

The invention belongs to the technical field of adaptive beamforming, and particularly relates to a diagonal loading based adaptive beamforming method for an array antenna. The diagonal loading based adaptive beamforming method specifically includes acquiring sample data through the array antenna, calculating a covariance matrix of the sample data, taking the value of the covariance matrix as an estimated value of an interference and noise covariance matrix, improving the covariance matrix by an diagonal loading method, and solving a guide vector of a constrained optimization problem estimation desired signal. A final simulation result verifies effectiveness of two improvement methods.

Description

technical field [0001] The invention belongs to the technical field of adaptive beamforming, in particular to an array antenna adaptive beamforming method based on diagonal loading. Background technique [0002] As one of the hallmarks of array signal processing, adaptive beamforming has been intensively studied in the past few decades and is widely used in many fields such as radar, wireless communication, sonar, seismic exploration and medical imaging. With the application in engineering practice, due to the inevitable existence of various errors in the array antenna, such as array element position disturbance error, mutual coupling, array element response error, contamination of training samples, and too few training samples, etc., will cause expectations The mismatch between the estimated value and the actual value of the steering vector of the signal will affect the performance of adaptive beamforming to varying degrees, making the robustness of adaptive beamforming mor...

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Application Information

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IPC IPC(8): G01S7/42H04B7/06
CPCG01S7/42H04B7/06
Inventor 朱圣棋胡海洋霍恩来高永婵杨东廖桂生陶海红
Owner XIDIAN UNIV
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