中文摘要：

在超声成像中,峰值旁瓣过高形成伪像,影响超声成像质量。针对超声换能器的特性,研究线性调频信号激励超声换能器后的带宽、扫描时间与脉冲压缩峰值旁瓣水平相关性,设计相应的调制/滤波方案抑制超声成像峰值旁瓣水平。理论分析和实验结果表明,线性调频信号激励换能器脉冲压缩后的峰值旁瓣水平分别随着线性调频信号带宽和扫描时间的增加而降低,通过比对分析理论与实验的差值,得到误差函数erf（B）、erf（T）;与tukey窗函数和Dolph-Chebyshev窗函数调制/滤波方案相比,kaiser窗函数调制/滤波方案更好地解决了脉冲压缩分辨率和峰值旁瓣水平的折衷问题,为最佳调制/滤波方案。

英文摘要：

In the ultrasonic imaging,high peak-side-lobe level causes artifacts,affecting the quality of ultrasonic imaging.Based on the characteristics of ultrasonic transducer,the relevance between the peak-side-lobe level after pulse compression and the bandwidth、scanning time of linear frequency modulation signal（LFM）after exciting the ultrasonic transducer was studied and the corresponding tapering/filtering scheme was designed to suppress the peak-side-lobe level.Theoretical analysis and experimental results have shown that the peak-side-lobe level after pulse compression of LFM signal exciting the transducer decreases with the increase of the bandwidth and scanning time of LFM signal.The error function erf（B）and erf（T）were obtained by comparing the difference between theoretical analysis and experiment.The tapering/filtering scheme of Kaiser window function has solved the tradeoff problem of pulse compression resolution and the peak-side-lobe level better,compared with the tapering/filtering schemes of Tukey and Dolph-Chebyshev window functions.