基于虚拟阵元设计的稀疏基阵的水下正视声学成像

Underwater imaging with the acoustic sensor sparse array optimized by the virtual element method

成像帧速率低、系统复杂是声学传感器基阵水下正视声学成像方法存在的主要问题.提出一种基于稀疏传感器基阵成像的方法,能提高成像速率和降低系统复杂性.该方法通过虚拟阵元技术优化设计2-D稀疏传感器基阵,并采用发射基阵同步发射编码信号和接收基阵同步接收回波信号的收发方案.仿真结果表明:与多子阵成像方法比较,该方法能够减少系统的复杂性和保证成像质量.

Low frame rate and high system complexity are the main problems of underwater imaging with the acoustic sensor array. One approach using the sparse array to reduce the complexity of imaging system was proposed in this paper. Moreover, the imaging system could obtain a high frame rate if the transmit signal and transmit-receive strategy were appropriate. The sparse array was firstly optimized with the virtual element method, then the orthorhombic coded signal and the synchronous transmit-receive strategy were used for the sparse array. The simulating results showed that the sparse array took on excellent- quality images and significantly reduced the imaging system complexity compared with the multi-subarray.