单基地多输入多输出声呐的方位分辨力

发布时间：2018-04-03 15:39

  本文选题：声呐　切入点：方位分辨力　出处：《声学学报》2016年02期

【摘要】：为了研究波形分集和发射子阵对多输入多输出(multiple-input multiple-output:MIMO)声呐方位分辨力的影响,建立了同时适用于MIMO声呐和传统有源声呐的远场和近场波束图推导模型,证明了这两种声呐具有相同的方位分辨力。首先,将MIMO声呐发射阵划分为子阵无重合与子阵有重合两种情况,并对传统有源声呐的发射阵也进行相同的划分。据此,推导出两者的远场和近场阵列流型向量均可表示为发射与接收阵列流型向量的直积。接着,利用阵列流型向量的一致性证明了波束图(远场和近场)的一致性。进一步地,证明了发射子阵有重合的情况等效于对发射阵列进行幅度加权(发射阵列中间部分的阵元权值大于两端部分的阵元权值),其可获得更低的波束图旁瓣级但不能提高方位分辨力。理论分析与仿真结果表明:MIMO声呐的有效孔径等于发射与接收联合孔径,其方位分辨力由发射与接收阵列结构所决定,波形分集和发射子阵并未带来更高的方位分辨力。
[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.
【作者单位】： 西北工业大学航海学院;中国科学院声学研究所声场声信息国家重点实验室;
【基金】：国家自然科学基金(51509204) 声场声信息国家重点实验室开放课题研究基金(SKLA201501) 西北工业大学中央高校基本科研业务费自由探索类项目(3102015ZY011)资助
【分类号】：TB56
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本文编号：1705836