本文選題：聲吶　切入點：方位分辨力　出處：《聲學(xué)學(xué)報》2016年02期

【摘要】：為了研究波形分集和發(fā)射子陣對多輸入多輸出(multiple-input multiple-output:MIMO)聲吶方位分辨力的影響,建立了同時適用于MIMO聲吶和傳統(tǒng)有源聲吶的遠(yuǎn)場和近場波束圖推導(dǎo)模型,證明了這兩種聲吶具有相同的方位分辨力。首先,將MIMO聲吶發(fā)射陣劃分為子陣無重合與子陣有重合兩種情況,并對傳統(tǒng)有源聲吶的發(fā)射陣也進行相同的劃分。據(jù)此,推導(dǎo)出兩者的遠(yuǎn)場和近場陣列流型向量均可表示為發(fā)射與接收陣列流型向量的直積。接著,利用陣列流型向量的一致性證明了波束圖(遠(yuǎn)場和近場)的一致性。進一步地,證明了發(fā)射子陣有重合的情況等效于對發(fā)射陣列進行幅度加權(quán)(發(fā)射陣列中間部分的陣元權(quán)值大于兩端部分的陣元權(quán)值),其可獲得更低的波束圖旁瓣級但不能提高方位分辨力。理論分析與仿真結(jié)果表明:MIMO聲吶的有效孔徑等于發(fā)射與接收聯(lián)合孔徑,其方位分辨力由發(fā)射與接收陣列結(jié)構(gòu)所決定,波形分集和發(fā)射子陣并未帶來更高的方位分辨力。
[Abstract]:In order to study the effect of waveform diversity and emitter array on the azimuth resolution of multiple-input multiple-output: MIMO-sonar, a far-field and near-field beam-pattern derivation model for both MIMO sonar and conventional active sonar was established.It is proved that the two sonar have the same azimuth resolution.Firstly, the MIMO sonar emitter array is divided into two cases: the subarray without coincidence and the subarray with the coincidence, and the traditional active sonar emitter array is also divided in the same way.Based on this, it is deduced that both far-field and near-field array flow pattern vectors can be expressed as the direct product of the transmitting and receiving array flow pattern vectors.Then, the coherence of beam pattern (far field and near field) is proved by using the consistency of array flow pattern vector.Further,It is proved that the superposition of the emitter array is equivalent to the amplitude weighting of the transmitting array (the weight of the middle part of the transmitting array is greater than the element weight of the two ends of the array, which can obtain lower sidelobe level of the beammap but can not improve the azimuth resolution.Theoretical analysis and simulation results show that the effective aperture is equal to the joint transmitting and receiving aperture, the azimuth resolution is determined by the structure of the transmitting and receiving array, and the waveform diversity and the emitter subarray do not bring higher azimuth resolution.
【作者單位】： 西北工業(yè)大學(xué)航海學(xué)院;中國科學(xué)院聲學(xué)研究所聲場聲信息國家重點實驗室;
【基金】：國家自然科學(xué)基金(51509204) 聲場聲信息國家重點實驗室開放課題研究基金(SKLA201501) 西北工業(yè)大學(xué)中央高�；究蒲袠I(yè)務(wù)費自由探索類項目(3102015ZY011)資助
【分類號】：TB56
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本文編號：1705836