本文選題：嵌套陣列 + 最大似然估計(jì)��； 參考：《航空學(xué)報(bào)》2017年11期

【摘要】：針對(duì)在輻射源個(gè)數(shù)未知的條件下嵌套陣列難以估計(jì)多個(gè)輻射源角度的問題,提出了基于最大似然估計(jì)(MLE)的嵌套陣列角度估計(jì)算法。算法在嵌套陣列模型的基礎(chǔ)上,首先通過推導(dǎo)陣列截獲多輻射源信號(hào)的最大似然函數(shù)及其梯度,利用最速下降法估計(jì)出空域中所有潛在輻射源的角度;然后,通過多元假設(shè)檢驗(yàn),利用最大似然比與門限進(jìn)行比較,確定出空域中所有潛在輻射源中某一時(shí)刻發(fā)射信號(hào)的活躍輻射源角度,排除其余噪聲形成的虛假輻射源角度,解決了在輻射源個(gè)數(shù)未知條件下嵌套陣列對(duì)多個(gè)輻射源角度估計(jì)問題。仿真結(jié)果表明:與傳統(tǒng)多重信號(hào)分類(MUSIC)算法相比,該算法在輻射源數(shù)目未知、存在相干信號(hào)、低信噪比(SNR)、低快拍數(shù)條件下,均具有較好的角度估計(jì)精度,并且算法形成的虛擬陣列自由度是空間平滑MUSIC算法的2倍;多元假設(shè)檢驗(yàn)法比傳統(tǒng)信源數(shù)目估計(jì)算法在低信噪比條件下和處理相干信號(hào)方面具有明顯優(yōu)勢(shì)。
[Abstract]:In order to solve the problem that it is difficult for nested arrays to estimate the angles of multiple emitters under the condition of unknown number of emitter sources, an algorithm for angle estimation of nested arrays based on maximum likelihood estimation (MLEs) is proposed. Based on the nested array model, the maximum likelihood function and its gradient of the array intercepting multiple emitter signals are derived, and the angle of all potential radiation sources in the spatial domain is estimated by the steepest descent method. By multivariate hypothesis test, the maximum likelihood ratio is compared with the threshold, and the active emitter angle of all potential radiation sources in airspace is determined at a certain time, and the false emitter angles formed by other noises are excluded. The problem of estimating the angles of multiple emitter sources by nested arrays with unknown number of emitter sources is solved. The simulation results show that the proposed algorithm has better angle estimation accuracy under the condition of unknown number of emitter sources, coherent signal, low signal-to-noise ratio (SNR) and low shot number. Moreover, the degree of freedom of virtual array formed by the algorithm is twice that of the spatial smooth MUSIC algorithm, and the multivariate hypothesis verification method has obvious advantages over the traditional estimation algorithm in terms of low signal-to-noise ratio (SNR) and coherent signal processing.
【作者單位】： 合肥電子工程學(xué)院;安徽省電子制約技術(shù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(61671453) 安徽省自然科學(xué)基金(1608085MF123)~~
【分類號(hào)】：TN97

【相似文獻(xiàn)】

相關(guān)期刊論文 前6條

1 張紅巖;射頻仿真目標(biāo)陣列系統(tǒng)計(jì)算機(jī)控制方法的研究[J];現(xiàn)代防御技術(shù);1993年01期

2 劉曉莉;廖桂生;曾操;;最大化陣列效率的方向圖綜合方法[J];西安電子科技大學(xué)學(xué)報(bào);2009年05期

3 謝鑫;李國(guó)林;徐晶晶;;采用有向陣元的扇形陣列DOA估計(jì)[J];系統(tǒng)仿真學(xué)報(bào);2011年04期

4 劉秉琦;周斌;張悅;閆宗群;張瑜;姜玉海;;基于圓孔陣列調(diào)制的“貓眼”目標(biāo)隱身技術(shù)[J];光電工程;2012年03期

5 陶小蛟 ,徐鋒;運(yùn)用最大似然估計(jì)進(jìn)行被動(dòng)目標(biāo)跟蹤[J];情報(bào)指揮控制系統(tǒng)與仿真技術(shù);1997年03期

6 賈旭山;金振中;;Bayes假設(shè)檢驗(yàn)及樣本數(shù)量問題研究[J];現(xiàn)代防御技術(shù);2012年04期

相關(guān)博士學(xué)位論文 前1條

1 呂衛(wèi)華;航空武器數(shù)據(jù)鏈陣列抗干擾技術(shù)研究[D];南京航空航天大學(xué);2016年

相關(guān)碩士學(xué)位論文 前1條

1 李娜;激光投影編碼式光敏陣列設(shè)計(jì)[D];西安工業(yè)大學(xué);2017年

，

本文編號(hào)：1913005