超声线性调频信号脉冲压缩的旁瓣特性研究

发布时间：2018-02-11 21:22

本文关键词： 线性调频信号带宽扫描时间窗函数峰值旁瓣水平　出处：《压电与声光》2016年01期 　论文类型：期刊论文

【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。
[Abstract]:In ultrasonic imaging, the peak sidelobe is too high to form a false image, which affects the ultrasonic imaging quality. According to the characteristics of ultrasonic transducer, the correlation between the bandwidth, scanning time and pulse compression peak sidelobe level of the ultrasonic transducer excited by LFM signal is studied. The corresponding modulation / filtering scheme is designed to suppress the peak sidelobe level of ultrasonic imaging. The theoretical analysis and experimental results show that, The peak sidelobe level decreases with the increase of LFM signal bandwidth and scanning time after pulse compression, and the difference between theory and experiment is compared. Compared with the tukey window function and the Dolph-Chebyshev window function modulation / filtering scheme, the proposed scheme solves the tradeoff problem between the pulse compression resolution and the peak sidelobe level, and is the best modulation / filtering scheme.
【作者单位】：陕西师范大学物理学与信息技术学院;
【基金】：国家自然科学基金资助项目(10974128;11274217)
【分类号】：TB559

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