摘要
设计发射阵列与接收阵列上下交错排列的稀疏阵列,可有效消除栅瓣和抑制旁瓣。针对稀疏超声相控阵列的相位模糊问题,采用直径为16mm的压电超声探头,利用活塞式振动和远声场近似,得到了相控阵的阵列因子和方向图,对不同阵元尺寸、间距、数目等参数的相控阵声场特性进行了仿真及优化。优化后的阵列比单列阵列结构更加紧凑,方向图旁瓣得到有效抑制,横向分辨率达到4.09°,扫描范围由30°扩大到50°。设计的稀疏超声相控阵列优化特性可用于空气中的障碍检测。
To deal with the phase blurring problem of sparse ultrasonic phased array, a placement strategy was a- dopted to eliminate grating lobes and suppress side lobes. The transmit array and receive array were placed in the up- per and lower row respectively, and the piezoelectric ultrasound probes with a diameter of 16ram were adopted. Array factor （AF） and directivity diagram of the phased array were obtained based on the assumption of piston-style vibra- tion and far ultrasound field. The characteristics of phased arrays composed of elements of different size, distance or number were simulated and optimized. The side lobes of the optimized phased array were suppressed effectively, and the structure of the optimized one was more compact. Its lateral resolution is up to 4.09°, and scanning range has ex- panded from 30° to 50°. The sparse ultrasonic phased array can be used to detect obstacles in the air.
出处
《计算机仿真》
CSCD
北大核心
2013年第3期205-208,318,共5页
Computer Simulation
基金
国防科工局核能开发科研项目(20111108-01)
四川省应用基础研究项目(2011JY0059)
关键词
稀疏超声相控阵
障碍检测
声场优化
方向图综合
Sparse ultrasonic phased array
Obstacle detection
Acoustic field optimization
Array pattern synthesis
