密集式MIMO声呐高分辨成像实验研究

为验证密集式多输入多输出(Multi-Input Multi-Output,MIMO)声呐高分辨成像算法的有效性,进行了水池实验并获得了期望的高分辨成像结果。首先,将成像算法分为角度维高分辨成像和距离维高分辨成像两种,分别建立了各自的成像处理流程。角度维高分辨成像基于虚拟阵列波束形成算法,距离维高分辨成像基于大带宽信号合成算法。然后,根据两种处理流程选择合适的发射信号和阵型,并据此搭建密集式MIMO声呐高分辨成像平台进行水池实验。最后,通过与传统单输入多输出(Single-Input Multi-Output,SIMO)声呐的成像结果进行对比,证明了MIMO声呐可结合发射信号、阵型和相应的处理流程获得更高的角度分辨率和距离分辨率。

On underwater experiments of high-resolution imaging with MIMO sonar

In order to verify the effectiveness of the high-resolution imaging method of the monostatic multiple input multiple output (MIMO) sonar, the tank experiment is carried out, and the expected high-resolution imaging results are obtained. Specifically, two methods, the angle-dimensional high-resolution imaging method and the range-dimensional high-resolution imaging method, are introduced and the corresponding two imaging procedures are given. The first one is based mainly on the virtual array beamforming algorithm, and the second is based on the large bandwidth signal synthesis algorithm. Then, with the use of the designed transmitting signal and the array configuration (the two methods have different transmitting signals and array configurations), an MIMO sonar high resolution imaging system is built for the tank experiment. Finally, via the tank experiment, it is proved that the MIMO sonar can achieve higher angle resolution and better range resolution of target imaging, when comparing with a traditional single-input multiple output(SIMO) sonar.