摘要
针对压电陶瓷换能器的频带特性,采用正弦波载频调制二相编码信号的激励方案,研究换能器对单位码元载有不同周期载频的二相巴克码激励信号的影响,分析回波的脉冲压缩处理结果,优化调制参数,探讨激励信号与换能器的最佳匹配方式.利用本文提出的最佳调制参数的编码激励信号,在多目标环境下对四根靶线的复杂回波进行脉冲压缩实验研究,结果表明超声换能器对这种激励信号的响应及其回波的脉冲压缩效果理想,可以极大地提高超声检测的信噪比.
Considering the frequency spectrum of the piezoelectric ceramic transducer,this study uses a bi-phase coding sig- nal modulated by a sine carder as the excitation mode. Through using Barker code signal with each chip modulated by different peri- ods of carrier,the transducer effect on the exciting signal and compression result is analyzed,modulation parameter is op ＂tmaized, and the best matching mode between the exciting signal and the transducer is discussed. The echo of four target wires is processed by pulse compression with the optimum signal, the result shows that this excitation mode has a good performance on the transducer response, and it can enhance the SNR of the ultrasonic signal significantly.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2011年第11期2701-2707,共7页
Acta Electronica Sinica
基金
国家自然科学基金(No.10974128)
关键词
相位编码
编码激励
载频调制
脉冲压缩
phase-coding
coded excitation
carrier modulation
pulse compression
