中文摘要：

针对矩形和圆环形换能器阵列，完成了宽带参量阵信号的波束合成仿真与结果比较分析。仿真结果表明，同等阵元个数N=9、相似阵列边界半径rm=49mm条件下，矩形阵列差频波波束主瓣-3dB指向角约为6．3°（圆环阵列约为7．4°），旁瓣几乎被完全抑制（圆环阵列约为主瓣峰值的10％），矩形阵列更利于提高主瓣指向性和抑制旁瓣幅度。针对矩形阵列，该文仿真分析了采用阵元信号延时方法实现参量阵信号波束偏转时的各波束特征，仿真结果显示，偏转后波束存在主瓣峰值点幅值削弱、主瓣峰值点未对准预定方向、主瓣宽度增大等问题。分析表明，以上问题可通过增加阵元数目及增大阵列尺寸进行修正。

英文摘要：

The simulation and analysis of beam-forming about broadband parametric array with rectangle trans- duction array and loop transduction array have been completed in this paper. The results show that under the condi- tion of the same array element numbers with N=9 and same array size with rm =49 mm,the -3 dB beam width of rectangle array is about 6.3° （comparing to 7.4° of loop array）, and its side-lobe amplitude is inhibited completely （comparing to the value of 10% about loop array）. It means that the rectangle array is more effective at beam direc- tivity improving and side-lobe amplitude inhibition. The method of element.signal time-delay is used to parametric ar- ray signals beam-steering implement. As a result of Beam-steering, the beam main-lobe turned to width more, its peak value of amplitude reduces obviously,and it doesn＇t point to the direction which is planned to. The reasons of these problems are discussed in this paper. It is verified that these problems could be corrected by increasing array elements and spreading array size.