發(fā)布時間：2018-02-11 21:22

  本文關(guān)鍵詞： 線性調(diào)頻信號 帶寬 掃描時間 窗函數(shù) 峰值旁瓣水平　出處：《壓電與聲光》2016年01期 　論文類型：期刊論文

【摘要】：在超聲成像中,峰值旁瓣過高形成偽像,影響超聲成像質(zhì)量。針對超聲換能器的特性,研究線性調(diào)頻信號激勵超聲換能器后的帶寬、掃描時間與脈沖壓縮峰值旁瓣水平相關(guān)性,設(shè)計相應(yīng)的調(diào)制/濾波方案抑制超聲成像峰值旁瓣水平。理論分析和實驗結(jié)果表明,線性調(diào)頻信號激勵換能器脈沖壓縮后的峰值旁瓣水平分別隨著線性調(diào)頻信號帶寬和掃描時間的增加而降低,通過比對分析理論與實驗的差值,得到誤差函數(shù)erf(B)、erf(T);與tukey窗函數(shù)和Dolph-Chebyshev窗函數(shù)調(diào)制/濾波方案相比,kaiser窗函數(shù)調(diào)制/濾波方案更好地解決了脈沖壓縮分辨率和峰值旁瓣水平的折衷問題,為最佳調(diào)制/濾波方案。
[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.
【作者單位】： 陜西師范大學(xué)物理學(xué)與信息技術(shù)學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(10974128;11274217)
【分類號】：TB559

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