基于連續(xù)差聯(lián)合陣列的非等距線陣無模糊波束形成方法

黃巖; 廖桂生; 李軍; 李婕

doi:10.11999/JEIT150321

基于連續(xù)差聯(lián)合陣列的非等距線陣無模糊波束形成方法

doi: 10.11999/JEIT150321 cstr: 32379.14.JEIT150321

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出版歷程
- 收稿日期: 2015-03-17
- 修回日期: 2015-08-21
- 刊出日期: 2015-12-19

Non-ambiguity Beamforming of Nonuniform Linear Array Based on Consecutive Difference Coarray

摘要

摘要: 該文針對非等距線陣波束形成產(chǎn)生柵瓣的問題，提出一種基于連續(xù)差聯(lián)合陣列的非等距線陣無模糊波束形成方法。該方法基于連續(xù)差聯(lián)合陣列對非等距線陣進(jìn)行陣形優(yōu)化分析，利用連續(xù)差聯(lián)合陣列與連續(xù)波程差一一對應(yīng)的特性，擴(kuò)展得到非等距線陣Toeplitz化的協(xié)方差矩陣。根據(jù)線性約束最小方差(LCMV)準(zhǔn)則，可以直接利用該協(xié)方差矩陣得到穩(wěn)健自適應(yīng)波束形成。由于重構(gòu)的協(xié)方差矩陣與相同孔徑等距線陣的協(xié)方差矩陣相似，不會(huì)產(chǎn)生相位模糊，避免了波束形成柵瓣的影響。大量的仿真實(shí)驗(yàn)證明了該文方法的穩(wěn)健性能。
- 信號處理 /
- 差聯(lián)合陣列 /
- 非等距線陣 /
- 無模糊波束形成
Abstract: As the beamforming of Nonuniform Linear Array (NLA) may occur grating lobes phenomenon, a beamforming method is proposed for working on the NLA with consecutive difference coarray. Firstly, this method analyzes the array optimization of the NLA based on consecutive difference coarray. Additionally, it can be concluded that the consecutive difference coarray is corresponding to the consecutive wavepath difference, which is applied to reconstruct the Toeplitz covariance matrix of the NLA. According to the Least Constraint Mean Variance (LCMV) rule, the reconstructed covariance matrix can directly be used for robust adaptive beamforming. Due to the similarity between the reconstructed covariance matrix and the covariance matrix of Uniform Linear Array (ULA) with the same aperture, the phase ambiguity will not happen and the grating lobes phenomenon will not occur. Extensive simulations show the robust effectiveness of the proposed method.
- Signal processing /
- Difference coarray /
- Nonuniform linear array /
- Non-ambiguity beamforming

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