融合降采样的复基带脉冲压缩算法研究  

A Complex Baseband Pulse Compression Algorithm Combined with the Down-Sampling Method

作　　者：王林泓[1] 王平[2] 

机构地区：[1]重庆电子工程职业学院应用电子学院,重庆410031 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《西南大学学报（自然科学版）》2016年第2期162-168,共7页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市科委自然科学基金项目(cstc2012jjA10129)

摘　　要：针对脉冲压缩过程运算复杂度高的问题,提出一种融合降采样的复基带脉冲压缩波束合成方法.该方法首先对波束合成信号进行频谱搬移及低通滤波,然后降采样得到复基带数据,再采用降采样的压缩滤波器实现脉冲压缩得到用于成像的扫描线数据.通过对所提出的脉冲压缩算法进行推导,并采用Chirp码进行脉冲压缩仿真成像与误差分析.实验结果表明:该方法不仅能够完整地保留编码激励信号各项特性,克服图像信噪比低的缺陷,还能大幅度降低脉冲压缩环节的运算复杂度,从而为超声编码技术的应用提供了一种高效的脉冲压缩方法.Aiming at the problem of high computation complexity of pulse compression,a method for complex baseband pulse compression combined with down sampling is proposed.Firstly,the spectrum of the echo signal is removed and filtered by the low-pass filter,and then the complex baseband data is down sampling.Finally,the pulse compression is realized by down sampling the compressing filter.The proposed algorithm is deduced and the Chirp code is used for pulse compression simulation and error analysis.Experimental results show that the presented method can not only improve the SNR and the vertical resolution of the image,but also greatly reduce the computation complexity of pulse compression.The proposed method can provide efficient pulse compression method for the ultrasonic coding technology.

关 键 词：脉冲压缩 超声成像 Chirp码 降采样 运算复杂度 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]