中文摘要：

为使成像声呐方位分辨率在工作频率和基阵孔径确定的情况下进一步提高，文中将MIMO雷达通信技术引入声呐成像领域，通过发射正交波形，使等效接收孔径大于实际接收孔径，从而提高方位分辨率和抗混响能力．通过计算机仿真和构建2发18收的MIMO成像声呐水池试验系统，利用MIMO声呐近场聚焦宽带波束形成成像算法，基于2种正交波形验证了MIMO成像声呐能够使目标的-3dB波束宽度减小一半，提高方位分辨率，且使目标成像强度增加约6dB，提高了抗混响能力．

英文摘要：

This paper applied MIMO （multi-input multi-output） radar technique based on orthogonal waveforms to the imaging sonar to heighten the azimuth resolution further under the definite frequency and array aperture. The e- quivalent receiver aperture was longer than real receiver aperture, so that the azimuth resolution and anti-reverbera- tion ability were improved. The computer simulations were completed, and the pool experimental system based on 2 transmitters / 18 receivers was built. The experimental dada was processed by near-filed focusing wide-band beamforming algorithm, and the result shows that the -3 dB beam width for MIMO imaging sonar is decreased to half, and the imaging strength of target is greatened by about 6 dB.